The document provides information on the FL7701 LED driver IC from Fairchild Semiconductor, including its features, typical applications, and demonstration of its use in a PAR20 LED bulb. Key points:
- The FL7701 is a smart LED driver IC with digital PFC, self biasing, overcurrent protection, and analog dimming capabilities.
- Typical applications include low-power LED lamps, luminaires, decorative lighting, and dimmable desk lamps.
- A demo board was modified to drive the LEDs in a Utilitech PAR20 bulb to demonstrate the FL7701's performance, achieving 72.6% efficiency with 0.82 power factor.
- Waveforms and
O documento discute diversos tipos de diodos semicondutores, incluindo LEDs, diodos zener, varicaps e fotodiodos. Explica como cada um funciona e como pode ser usado, destacando suas características e aplicações principais.
To design and analyze the sound detector circuit.
Objective: - To analyze the sound detection using quad op-amp and getting the output across the led.
The LM324series consists of four independent High-gain, internally frequency-compensated operational amplifiers. Designed specifically to operate from a single power supply over aWide range of voltages
Este documento fornece instruções de instalação e especificações técnicas para um sistema de vídeo porteiro. Ele descreve como conectar as unidades interna e externa usando cabos blindados e aterrados para distâncias entre 51-100 metros, e fornece detalhes sobre a fixação das unidades.
Este documento describe un amplificador estéreo de 200W (100W por canal) ideal para videorockolas. Incluye una lista de materiales, diagramas esquemáticos, circuito impreso y posición de componentes para construir el amplificador, el cual puede funcionar con una carga de 4 u 8 ohmios utilizando un ventilador adicional en este último caso.
El documento compara la curva característica de un diodo Zener y un diodo túnel. Un diodo Zener conduce corriente en ambas direcciones y se utiliza comúnmente como regulador de voltaje o protector. Un diodo túnel conduce corriente a través del efecto túnel cuántico, haciendo que su curva característica aumente y disminuya con el voltaje debido a los cambios en los estados de la banda de conducción. Ambos diodos exhiben zonas de trabajo y ruptura en
IC Design of Power Management Circuits (IV)Claudia Sin
by Wing-Hung Ki
Integrated Power Electronics Laboratory
ECE Dept., HKUST
Clear Water Bay, Hong Kong
www.ee.ust.hk/~eeki
International Symposium on Integrated Circuits
Singapore, Dec. 14, 2009
Substituição ( 2sc1969 por erf 2030 ) na placa ept3600João Pereira
This document provides instructions for modifying Galaxy DX radios to replace the 2SC1969 MOSFET with an ERF-2030 MOSFET to increase power output. The 3-step modification involves: 1) Removing the 2SC1969 and capacitor C167. 2) Removing a 22uH choke. 3) Installing the ERF-2030 and a gate driver EN-369DR, soldering leads to the appropriate pins. Testing showed the ERF-2030 increased peak power output over the 2SC1969 without increasing current draw.
O documento discute diversos tipos de diodos semicondutores, incluindo LEDs, diodos zener, varicaps e fotodiodos. Explica como cada um funciona e como pode ser usado, destacando suas características e aplicações principais.
To design and analyze the sound detector circuit.
Objective: - To analyze the sound detection using quad op-amp and getting the output across the led.
The LM324series consists of four independent High-gain, internally frequency-compensated operational amplifiers. Designed specifically to operate from a single power supply over aWide range of voltages
Este documento fornece instruções de instalação e especificações técnicas para um sistema de vídeo porteiro. Ele descreve como conectar as unidades interna e externa usando cabos blindados e aterrados para distâncias entre 51-100 metros, e fornece detalhes sobre a fixação das unidades.
Este documento describe un amplificador estéreo de 200W (100W por canal) ideal para videorockolas. Incluye una lista de materiales, diagramas esquemáticos, circuito impreso y posición de componentes para construir el amplificador, el cual puede funcionar con una carga de 4 u 8 ohmios utilizando un ventilador adicional en este último caso.
El documento compara la curva característica de un diodo Zener y un diodo túnel. Un diodo Zener conduce corriente en ambas direcciones y se utiliza comúnmente como regulador de voltaje o protector. Un diodo túnel conduce corriente a través del efecto túnel cuántico, haciendo que su curva característica aumente y disminuya con el voltaje debido a los cambios en los estados de la banda de conducción. Ambos diodos exhiben zonas de trabajo y ruptura en
IC Design of Power Management Circuits (IV)Claudia Sin
by Wing-Hung Ki
Integrated Power Electronics Laboratory
ECE Dept., HKUST
Clear Water Bay, Hong Kong
www.ee.ust.hk/~eeki
International Symposium on Integrated Circuits
Singapore, Dec. 14, 2009
Substituição ( 2sc1969 por erf 2030 ) na placa ept3600João Pereira
This document provides instructions for modifying Galaxy DX radios to replace the 2SC1969 MOSFET with an ERF-2030 MOSFET to increase power output. The 3-step modification involves: 1) Removing the 2SC1969 and capacitor C167. 2) Removing a 22uH choke. 3) Installing the ERF-2030 and a gate driver EN-369DR, soldering leads to the appropriate pins. Testing showed the ERF-2030 increased peak power output over the 2SC1969 without increasing current draw.
Este documento proporciona información sobre un amplificador de 180W con el circuito integrado TDA7294, incluyendo un diagrama esquemático, valores de componentes recomendados, posición de los componentes en la placa de circuito impreso, máscara de componentes, lista de materiales y preguntas frecuentes. El documento describe en detalle cómo construir este amplificador de potencia.
IC Design of Power Management Circuits (I)Claudia Sin
by Wing-Hung Ki
Integrated Power Electronics Laboratory
ECE Dept., HKUST
Clear Water Bay, Hong Kong
www.ee.ust.hk/~eeki
International Symposium on Integrated Circuits
Singapore, Dec. 14, 2009
Este diagrama muestra la ruta de alimentación y señal de audio para una instalación de sonido estéreo. La alimentación de 120V/220V AC se transforma a 12V DC y se distribuye a los amplificadores de 250W, preamplificadores y otros componentes. La señal de audio estéreo ingresa a los preamplificadores y se envía a los amplificadores y parlantes a través de un sumador.
Este documento describe diferentes circuitos con amplificadores operacionales, incluyendo:
1) Un amplificador inversor que produce una salida 180° desfasada de la entrada y con ganancia ajustable a 1.
2) Un amplificador no inversor con salida en fase con la entrada pero ganancia no ajustable a 1.
3) Un sumador inversor de 3 canales que suma las señales de entrada y un sumador no inversor similar.
Excelente amplificador estéreo de 60 watts que usa el TDA2050. Tiene incluido un preamplificador con control de tonos y ecualizador de 2 bandas.
Espero sea de gran utilidad.
Este inversor con fines educativos, muestra como funcionan los inversores convencionales.
Además si se le coloca un relay, se pude apreciar el comportamiento básico de una UPS o unidad de poder ininterrumpida.
This document discusses electromagnetic interference (EMI) and electromagnetic compatibility (EMC). It defines EMI as electromagnetic disturbances to electrical circuits from electromagnetic fields. EMC is the ability of equipment to operate satisfactorily in an electromagnetic environment without causing intolerable interference. The document describes different types of EMI and discusses various causes of EMI like electrical systems, static electricity, and unbalanced circuits. It also summarizes methods to protect against EMI like twisted wires, proper cable installation, bonding, shielding, and using transformers and opto-isolators.
Este documento trata sobre electrónica de potencia y diodos de potencia. Explica que la electrónica de potencia enlaza la electricidad con la electrónica mediante dispositivos capaces de soportar altas potencias. Luego, se centra en los diodos de potencia, describiendo sus características, curvas, encapsulados y aplicaciones principales como fuentes de alimentación y convertidores.
Con este documento, usted podrá aprender a construir un preamplificador con control de tonos de alto orden, controlado por voltaje, ideal para las video rockolas digitales.
Este documento presenta un circuito de control de tonos con tres bandas de frecuencia (bajos, medios y agudos) utilizando amplificadores operacionales. Describe los objetivos de identificar e implementar el circuito, así como los componentes necesarios como resistencias, condensadores, potenciómetros e integrados. Finalmente, incluye el esquema del circuito y la serigrafía para su construcción.
Este documento describe el funcionamiento de la fuente de alimentación de un televisor Sony. Explica que la fuente de espera (standby) genera 3.3V para alimentar la placa principal cuando el televisor está apagado. Al presionar el botón de encendido, se envía una señal que enciende un optoacoplador, el cual activa el oscilador de la fuente de alimentación para generar los voltajes necesarios y encender el televisor. También describe las protecciones contra sobreconsumo y sobrevoltaje de las fuentes PFC e In
Excelente amplificador estereo de 40w, ideal para videorockolas. Trae un control de volumen, balance y tonos controlados por tensión, que permite colocar los potenciómetros de control hasta 30 metros de distancia del amplificador sin introducir ruido alguno.
POLARIZACiÓN Y GANANCIA DEL AMPLIFICADOR EN EMISOR COMÚNOmaar' Lozanno'
Este documento describe un experimento para medir la ganancia de voltaje de un amplificador en emisor común usando un transistor NPN. El objetivo era construir y probar el circuito, medir las tensiones y corrientes en diferentes puntos, y observar el efecto del capacitor de derivación del emisor en la ganancia. Se realizaron cálculos para estabilizar la polarización y medir la ganancia con y sin el capacitor. Hubo problemas con la fuente de alimentación y el transistor que se corrigieron para que el circuito funcionara correctamente.
The document discusses different types of field effect transistors (FETs), including:
1) Junction FETs (JFETs), which operate in depletion mode only and have a non-linear relationship between input voltage and output current.
2) Depletion-mode metal-oxide-semiconductor FETs (D-MOSFETs), which can operate in either depletion or enhancement mode.
3) Enhancement-mode MOSFETs (E-MOSFETs), which only operate in enhancement mode and have an output current of zero until the input voltage exceeds the threshold voltage.
FIELD EFFECT TRANSISTERS (FET)
Types of Field Effect Transistors
i) Junction field effect transistor (JFET)
(ii) Metal oxide semiconductor field effect transistor (MOSFET)
LED Streetlight APEC Demo Performance_SMappus 03062013 AC 12 Mar 2013Steve Mappus
This document provides specifications and design details for a 100W LED power supply using Fairchild semiconductor components. The power supply uses a BCM PFC controller and boost follower for wide input voltage range of 80-310VAC. A 2-switch flyback converter provides constant current or constant voltage output to 1 or 4 LED channels. Control and protection ICs are also detailed to balance current across multiple LED strings.
This document provides instructions for demonstrating a FAN7688 demo configuration at APEC 2015. The demo uses a FAN7688 evaluation board (EVB) with secondary-side SR control operating at 12.5V output from 330-410V input and up to 20A output. Diagrams and instructions explain how to connect oscilloscopes, power supplies and loads to the EVB and how to safely power up and down the demo. Contact information is provided for technical support.
Este documento proporciona información sobre un amplificador de 180W con el circuito integrado TDA7294, incluyendo un diagrama esquemático, valores de componentes recomendados, posición de los componentes en la placa de circuito impreso, máscara de componentes, lista de materiales y preguntas frecuentes. El documento describe en detalle cómo construir este amplificador de potencia.
IC Design of Power Management Circuits (I)Claudia Sin
by Wing-Hung Ki
Integrated Power Electronics Laboratory
ECE Dept., HKUST
Clear Water Bay, Hong Kong
www.ee.ust.hk/~eeki
International Symposium on Integrated Circuits
Singapore, Dec. 14, 2009
Este diagrama muestra la ruta de alimentación y señal de audio para una instalación de sonido estéreo. La alimentación de 120V/220V AC se transforma a 12V DC y se distribuye a los amplificadores de 250W, preamplificadores y otros componentes. La señal de audio estéreo ingresa a los preamplificadores y se envía a los amplificadores y parlantes a través de un sumador.
Este documento describe diferentes circuitos con amplificadores operacionales, incluyendo:
1) Un amplificador inversor que produce una salida 180° desfasada de la entrada y con ganancia ajustable a 1.
2) Un amplificador no inversor con salida en fase con la entrada pero ganancia no ajustable a 1.
3) Un sumador inversor de 3 canales que suma las señales de entrada y un sumador no inversor similar.
Excelente amplificador estéreo de 60 watts que usa el TDA2050. Tiene incluido un preamplificador con control de tonos y ecualizador de 2 bandas.
Espero sea de gran utilidad.
Este inversor con fines educativos, muestra como funcionan los inversores convencionales.
Además si se le coloca un relay, se pude apreciar el comportamiento básico de una UPS o unidad de poder ininterrumpida.
This document discusses electromagnetic interference (EMI) and electromagnetic compatibility (EMC). It defines EMI as electromagnetic disturbances to electrical circuits from electromagnetic fields. EMC is the ability of equipment to operate satisfactorily in an electromagnetic environment without causing intolerable interference. The document describes different types of EMI and discusses various causes of EMI like electrical systems, static electricity, and unbalanced circuits. It also summarizes methods to protect against EMI like twisted wires, proper cable installation, bonding, shielding, and using transformers and opto-isolators.
Este documento trata sobre electrónica de potencia y diodos de potencia. Explica que la electrónica de potencia enlaza la electricidad con la electrónica mediante dispositivos capaces de soportar altas potencias. Luego, se centra en los diodos de potencia, describiendo sus características, curvas, encapsulados y aplicaciones principales como fuentes de alimentación y convertidores.
Con este documento, usted podrá aprender a construir un preamplificador con control de tonos de alto orden, controlado por voltaje, ideal para las video rockolas digitales.
Este documento presenta un circuito de control de tonos con tres bandas de frecuencia (bajos, medios y agudos) utilizando amplificadores operacionales. Describe los objetivos de identificar e implementar el circuito, así como los componentes necesarios como resistencias, condensadores, potenciómetros e integrados. Finalmente, incluye el esquema del circuito y la serigrafía para su construcción.
Este documento describe el funcionamiento de la fuente de alimentación de un televisor Sony. Explica que la fuente de espera (standby) genera 3.3V para alimentar la placa principal cuando el televisor está apagado. Al presionar el botón de encendido, se envía una señal que enciende un optoacoplador, el cual activa el oscilador de la fuente de alimentación para generar los voltajes necesarios y encender el televisor. También describe las protecciones contra sobreconsumo y sobrevoltaje de las fuentes PFC e In
Excelente amplificador estereo de 40w, ideal para videorockolas. Trae un control de volumen, balance y tonos controlados por tensión, que permite colocar los potenciómetros de control hasta 30 metros de distancia del amplificador sin introducir ruido alguno.
POLARIZACiÓN Y GANANCIA DEL AMPLIFICADOR EN EMISOR COMÚNOmaar' Lozanno'
Este documento describe un experimento para medir la ganancia de voltaje de un amplificador en emisor común usando un transistor NPN. El objetivo era construir y probar el circuito, medir las tensiones y corrientes en diferentes puntos, y observar el efecto del capacitor de derivación del emisor en la ganancia. Se realizaron cálculos para estabilizar la polarización y medir la ganancia con y sin el capacitor. Hubo problemas con la fuente de alimentación y el transistor que se corrigieron para que el circuito funcionara correctamente.
The document discusses different types of field effect transistors (FETs), including:
1) Junction FETs (JFETs), which operate in depletion mode only and have a non-linear relationship between input voltage and output current.
2) Depletion-mode metal-oxide-semiconductor FETs (D-MOSFETs), which can operate in either depletion or enhancement mode.
3) Enhancement-mode MOSFETs (E-MOSFETs), which only operate in enhancement mode and have an output current of zero until the input voltage exceeds the threshold voltage.
FIELD EFFECT TRANSISTERS (FET)
Types of Field Effect Transistors
i) Junction field effect transistor (JFET)
(ii) Metal oxide semiconductor field effect transistor (MOSFET)
LED Streetlight APEC Demo Performance_SMappus 03062013 AC 12 Mar 2013Steve Mappus
This document provides specifications and design details for a 100W LED power supply using Fairchild semiconductor components. The power supply uses a BCM PFC controller and boost follower for wide input voltage range of 80-310VAC. A 2-switch flyback converter provides constant current or constant voltage output to 1 or 4 LED channels. Control and protection ICs are also detailed to balance current across multiple LED strings.
This document provides instructions for demonstrating a FAN7688 demo configuration at APEC 2015. The demo uses a FAN7688 evaluation board (EVB) with secondary-side SR control operating at 12.5V output from 330-410V input and up to 20A output. Diagrams and instructions explain how to connect oscilloscopes, power supplies and loads to the EVB and how to safely power up and down the demo. Contact information is provided for technical support.
This document provides a user guide for the FEBFAN7688_I00250A evaluation board, which allows testing of the FAN7688 LLC resonant controller. The evaluation board operates from 300-450V input and regulates the output to 12.5V at up to 20A. The guide describes the board features, specifications, test procedures, schematic, and test data results for startup, efficiency, regulation, and protection functions.
This document provides a user guide for the FEBFAN9611_S01U300A evaluation board featuring the FAN9611 300W interleaved dual-BCM low-profile PFC controller. The evaluation board is optimized for demonstrating the FAN9611's efficiency and protection features in a 300W design with less than 18mm profile. Safety precautions are provided for testing the board, which produces lethal voltages. Key features, specifications, test procedures, schematic, BOM and test results are documented.
This document provides an overview of driving high-brightness LEDs in high-power industrial lighting fixtures. It discusses high-brightness LED characteristics, system requirements, and LED driver topologies including single-stage versus two-stage designs and LED load control using parallel LED strings. It also presents a 100W industrial LED design example, including power stage calculations and test results. Key aspects covered include high-power industrial LED applications, HB-LED electrical characteristics, CC-CV driver operation, single and two-stage driver topologies, LED string control methods, and a detailed two-stage flyback LED driver design procedure and specifications.
(1) Current shaping strategies for buck power factor correction converters are discussed. (2) Sine-squared modulation is analyzed where the average inductor current is shaped to follow a sine-squared waveform to improve the power factor. (3) The K-value, which determines the conduction angle and power factor, is analyzed and its impact on the harmonic content of the input current is shown, with various harmonics either meeting or violating Class C and Class D emission standards based on the K-value.
Power Topologies_Full Deck_04251964_MappusSteve Mappus
The document provides an overview of various power converter topologies, including:
- Non-isolated converter topologies like boost, buck, and buck-boost converters and their isolated derivatives.
- Single-ended converter topologies like forward and flyback converters that use transformer reset techniques like reset winding and resonant reset.
- Double-ended topologies like push-pull, half-bridge, and full-bridge converters.
- It discusses the advantages of different topologies for applications like low, mid, and high power as well as operating modes like continuous and discontinuous conduction.
APEC 2010 ACDC Live Demo Tech SessionPresentation_Feb 19 2010Steve Mappus
The document describes a 300W AC-DC power supply design using Fairchild semiconductor components. It uses an interleaved boost PFC converter with the FAN9612 controller to regulate the output to 390VDC with over 90% efficiency. A 300W asymmetrical half-bridge DC-DC converter with the FSFA2100 controller then converts the 390VDC to a 12VDC output with over 92% total efficiency. Design waveforms and performance data are provided to show the operation and benefits of the interleaved PFC and DC-DC converter topology.
Webinar: Desmistificando projetos de fontes chaveadasEmbarcados
Possibilitar engenheiros com pouca familiaridade com eletronica de potencia a desenvolver fontes chaveadas. São apresentadas também soluções para o projeto de fontes chaveadas da ST.
Video do Webinar: https://www.embarcados.com.br/webinars/webinar-desmistificando-projetos-de-fontes-chaveadas/
LM3405 : Constant Current Regulator for Powering LEDs Premier Farnell
The document provides an overview of the LM3405 constant current regulator for powering LEDs. It describes the key features of the LM3405 such as its operating voltage range, package type, switching frequency, and enable/dimming functionality. It also includes diagrams of the internal block diagram and typical application circuit as well as guidance on designing the inductor, capacitors, and diodes in the circuit.
Summary
1. ON Semiconductor has solutions for all low power offline driver topologies: Flyback, Buck-Boost, Buck-Boost, Linear
2. Primary Side Control approach optimized for tight accuracy and wide Vf support for high production yield and reduced development time
3. General shift in market to address non-isolated topologies
Original Power Supply IC LNK626PG LNK626P LNK626 DIP-7 New Power IntegrationAUTHELECTRONIC
Original Power Supply IC LNK626PG LNK626P LNK626 DIP-7 New Power Integration
https://authelectronic.com/original-power-ic-lnk626pg-lnk626p-lnk626-dip-7-new-power-integration
ppt of automatic room light controller and BI directional counterMannavapremkumar
This document is a project presentation for an automatic room light controller. It includes the objective, introduction, block diagram, circuit diagram, advantages, disadvantages, limitations and applications. The block diagram shows the components used including IR transmitters and receivers, timers, counters and a relay to control the room light. The circuit diagram provides more details of the electronic components and connections used to automatically turn the light on when motion is detected and off when the room is empty.
The document provides information about the Model XK-550 Digital/Analog Trainer:
1) It has five power supplies, a function generator, digital trainer section with logic switches and indicators, and two breadboards for prototyping circuits.
2) The power supplies include two variable outputs of 0-20V and 0- -20V at 0.5A, and three fixed outputs of +12V, -12V, and +5V at 1A.
3) The function generator can produce sine, square, and triangle waves from 1Hz to 100kHz with an amplitude of 0-15Vpp.
4) The digital trainer has a clock generator, logic switches
Original Transition-Mode PFC Controller IC LD7591GS 7591 SOP-8 New LeadtrendAUTHELECTRONIC
This document provides information about the LD7591 transition-mode PFC controller, including:
- It is a voltage mode PFC controller that operates in transition mode with protections like OVP, OCP, and brown-in protection.
- It has features like low startup current, over voltage protection, open feedback protection, disable function, and integrated current sensing.
- Typical applications include adapters over 65W, open frame switching power supplies, LCD TV power supplies, and LED power supplies.
The document describes an analog servo drive called the BDC40A20. It can provide a peak current of 40A and continuous current of 20A from a 60-190VDC supply voltage. It is designed to drive brushless DC motors at a high switching frequency of 20kHz and includes protections against overloads. It interfaces with digital controllers using PWM and direction signals and supports hall sensor feedback.
This document is a datasheet for the TD1410, a 380KHz fixed frequency monolithic step down switch mode regulator with a built in internal Power MOSFET capable of delivering 2A of continuous output current over a wide input voltage range. The datasheet provides details on the device including electrical specifications, typical application circuits, thermal considerations, and function descriptions of the various pins. It is intended to provide engineers with the necessary information to properly utilize the TD1410 in their circuit designs.
The AZBDC20A20 is a brushless DC motor drive capable of delivering 20A peak current and 10A continuous current. It has over-voltage, over-current, and thermal protection. The drive requires only a single DC power supply and PWM control input, and is compatible with hall sensor or trapezoidal commutation of 3-phase brushless motors or single phase brushed motors.
The AZ20A20DDC is a PWM servo drive designed to drive brush-type DC motors. It has a peak current of 20A and continuous current of 10A, with a supply voltage range of 40-175VDC. The drive integrates directly into PCBs and has protections against overvoltage, undervoltage, overcurrent, overheating and short circuits.
XLSEMI XL140 2A 380KHz 18V Buck DC to DC Converterdegarden
The XL1410 is a 380KHz fixed frequency buck converter capable of supplying 2A loads from 3.6V to 18V input voltages. It requires few external components and has high efficiency, low ripple, and excellent line and load regulation. Key features include adjustable output from 1.222V to 16V, 100% maximum duty cycle, internal MOSFET, and protections such as overcurrent, short circuit, and thermal shutdown. It is available in an 8-pin SOP package.
The AL5809 is a constant current linear LED driver that provides a cost-effective two pin solution for driving LEDs. It has excellent temperature stability of 20ppm/°C and regulates current to ±5% over a wide voltage and temperature range. It is available with various fixed output currents and supports both high-side and low-side driving of LED chains from 2.5V to 60V. It can linearly drive long strings of LEDs and includes features such as a wide operating temperature range, high power supply rejection ratio, and RoHS compliance.
The 25A20DD PWM servo amplifier is designed to drive brush DC motors with up to 25A of peak current. It has adjustable current limits, fault protection, and single supply operation. It interfaces with digital controllers via PWM and direction inputs to control motor speed and direction.
Design and fabrication of over voltage relay Prem Kumar
This document describes the design and fabrication of an over voltage relay to be integrated into a power system lab. It presents the circuit design which uses a transformer, rectifier, regulators, op-amp, resistors, capacitors, diode, potentiometer, and relay. The over voltage relay works by comparing the input voltage to a reference voltage using an op-amp circuit. If the input voltage is higher than the reference voltage, the relay will trip to protect equipment from overvoltage.
The HV9910 is a constant current LED driver IC that operates from 8V to 450V inputs and drives one or more LED strings. It controls an external MOSFET at frequencies up to 300kHz to provide constant current regulation. The output current can be programmed between a few mA to over 1A. It has dimming control via linear current control or low frequency PWM and is suitable for applications such as lighting, displays, and automotive uses.
The document provides design details for a critical conduction mode power factor correction (PFC) circuit. It includes:
1) An introduction describing the need for power factor correction to draw sinusoidal current in phase with input voltage for improved power factor.
2) An application circuit diagram for a 400V/200W PFC circuit using a TB6819AFG controller IC along with component values and simulation parameters.
3) Explanations of techniques used including time scaling to speed up simulations and modeling of a common mode choke coil.
4) An 8-step design process covering the output voltage feedback, output capacitor sizing, inductor, input capacitor, auxiliary winding, current/zero current detection
Constant current regulators (CCRs) are self-biased circuits that provide constant current to LEDs over a wide range of input voltages and temperatures to ensure consistent brightness. CCRs offer advantages over resistor-based and linear/switching regulator solutions by improving efficiency and simplifying design while providing protection for LEDs. The document discusses CCR product offerings and design examples for driving single or multiple LED strings from various power sources.
The AZB20A20 PWM servo drive is designed to drive brushless DC motors. It has a peak current of 20A, continuous current of 10A, and operates on a supply voltage of 40-175VDC. It provides hardware protection against over-voltage, under-voltage, over-current, over-heating and short-circuits. The drive requires only a single unregulated power supply and interfaces with digital controllers that have analog ±10V outputs.
2. www.fairchildsemi.com2
FL7701 Features
• Digital PFC Function
• Self Biasing
• Cycle-by-Cycle OCP
• Programmable Frequency
• Programmable LED Output
Current
• Internal Soft Start
• Flicker-Free Analog Dimming
• Open & Short LED Protection
• High Voltage, AC or DC Input
• 8-Pin Narrow Body SOIC
FL7701 Smart LED Driver with PFC
GND
RT OUT
HVVCC
Reference
ADIM
JFET
AOCP
IAD
UVLO
QR
S
TSD
Leading Edge
Blanking
ZCD
DAC
Soft start
Digital Block
CS
Oscillator
-
+
LEB
-
+
time
VCC
ZCD
2.5V
1
2
83
5
4
6
FL7701
1
2
3
4 5
6
7
8
NC
HV
GND
ADIMRT
VCC
OUT
CS
3. www.fairchildsemi.com3
FL7701 Typical Applications
• Non-isolated, low-power (<10W) LED lamps operating from US or EU, AC line
voltage
• Residential, non-dimming, LED luminaries (A, E, MR, PAR, GU, etc)
• Decorative LED lighting
• Low-power LED driver with 1V-10V analog or PWM dimming
• T-style LED ballast
• LED desk lamps with step dimming
FL7701 Benefits
• High power factor
• High efficiency
• Maintains high PF during analog dimming
• Non-isolated buck topology uses commonly available, low-cost, off-the-shelf inductors
• Non-isolated buck topology requires no output bulk capacitor
• Low component count, small form factor
FL7701 Applications & Benefits
5. www.fairchildsemi.com5
• Removed all Potting Material
• Removed Utilitech LED Driver Power Supply
• Machined Bulb Base and Aluminum Heatsink to Allow Cutaway View of Exposed Bulb
Base
• Redesigned FL7701, FEBL031-2 EVB to Meet Electrical and Mechanical Requirements
of Utilitech Pro PAR20 Bulb Housing
• Utilitech Pro PAR20 LED Bulb used as Load to Demonstrate FL7701 Technology
Features
Utilitech Pro PAR20 LED Bulb
Cutaway Bulb Base
8. www.fairchildsemi.com8
LED Driver Electrical Performance Comparison
• Utilitech Pro PAR20 Power Supply Topology is Isolated Flyback that is
Triac Dimmable
• FL7701 Topology is Non-Isolated Buck that is self-biased from the AC
line voltage and is therefore not Triac Dimmable
• FL7701 Flicker-Free, Analog Dimming is Demonstrated BUT is not
Feasible for Residential LED Replacement Bulbs Requiring Dimming
• FL7701 Solution has Fewer Components, Higher Power Factor and
Comparably Similar Efficiency
VIN(V) PIN(W) VOUT(V) IOUT(mA) POUT(W) PF η
Utilitech PAR20
Power Supply
120 7.2 12.15 430 5.22 0.82 72.6%
FEBL031-2
(Unmodified)
220 8.71 32.8 260 7.56 0.95 86.8%
FEBL031-2A
(Modified)
120 7.2 12.17 431 5.25 0.942 72.8%
9. www.fairchildsemi.com9
FEBL031-2A Typical Test Set Up
Required Test Equipment:
1. Plugs into any standard 120VAC US line wall outlet
2. (3) battery powered DVMs (VIN, VLED, ILED)
3. (1) Oscilloscope
4. (2) Current Probes
5. (2) High Voltage Differential Probes (DO NOT USE GROUNDED VOLTAGE PROBES)
Recommended Test Equipment:
1. (1) Power meter can be used to show PF and THD verses dimming. Depending upon the
capabilities of the oscilloscope, PF may be shown using oscilloscope calculation measurement
(as done in test set up shown above).
WARNING
• Do not use standard
oscilloscope voltage probes to
probe any signals from back of
demo box. The demo is
operating directly from AC, off-
line and is non-isolated so
attaching any scope ground will
damage the circuit.
10. www.fairchildsemi.com10
FEBL031-2A, PAR20 Demo Operation
• (A) Non-operational Static FEBLO31-2A EVB (shows reverse side of EVB from what is shown inside LED bulb)
• (B) LIVE operational demo protected by acrylic cover. Everything on the demo is safe to touch.
• (C) Open LED momentary push button (when pushed and held, bulb output disables and recovers when push button is
released)
• (D) Short LED momentary push button (when pushed and held, bulb output disables and recovers when push button is
released)
• (E) Dimming function potentiometer varies the FL7701 ADIM voltage. LED bulb can turn on in any DIM position.
• (F) ON/OFF rocker switch provides AC power to bulb
A
B
C D E
F
11. www.fairchildsemi.com11
FEBL031-2A, PAR20 Demo Back Panel
• (A) High Voltage Diff Probe (measure AC line voltage, oscilloscope channel 1)
• (B) Battery powered DVM (measure AC line RMS voltage)
• (C) 5A replaceable AC line Fuse
• (D) AC line cord is split apart in this location to allow current probe connection (measure AC line current, oscilloscope
channel 2)
• (E) ON/OFF switch for blue light on front panel “power symbol”. The blue LED is independent from AC line voltage and
is powered by 2 AA batteries.
• (F) High Voltage Diff Probe (measure LED voltage, oscilloscope channel 3), OR connect a battery powered DVM here to
display the RMS LED voltage
• (G) Battery powered DVM (measure LED RMS voltage). IMPORTANT NOTE: Must connect either the DVM (set to
measure current), OR shunt jumper (shown) to allow current to flow to the PAR20 LED array. Current probe
(measure LED current, oscilloscope channel 4) can now be connected to either the DVM lead or the shunt jumper.
A
B
C
D
E
F
G
14. www.fairchildsemi.com14
• Open LED Fault
• LED Current is Zero
• LED Voltage is Peak AC Line
Voltage
FEBL031-2A LED Fault Testing
CH1=VIN, CH2=IIN, CH3=VLED, CH4=ILED
• Short LED (String) Fault
• LED Current is Max Limited
by FL7701 OCP Function
• LED Voltage is Zero
15. www.fairchildsemi.com15
• 120VAC Soft Start
• AC Phase is detected on VCC
• EA voltage reference set to AC
• CS voltage threshold set to
0.365V
FEBL031-2A AC vs. DC Soft Start
CH1=VIN, CH2=IIN, CH3=VLED, CH4=ILED
• 170VDC Soft Start
• No AC phase detected on VCC
• EA voltage reference set to DC
• CS voltage reference set to
0.5V
17. www.fairchildsemi.com17
FEBL031-2A LED Capacitor Comparison
Cap VIN(VAC) PIN(W) VOUT(V) IOUT(mA) POUT(W) η PF THD
0 120 7.3 11.86 441 5.23 71.6% .944 29.78%
10µF 120 7.3 11.93 441 5.26 72.06% .944 29.16%
470µF 120 7.3 12.00 442 5.3 72.6% .934 29.18%
1000µF 120 7.3 12.04 442 5.32 72.8% .934 29.74%
• Reduced output LED, high frequency, ripple current is sometimes desirable for
improving LED reliability
• Aluminum electrolytic capacitor can be added in parallel with LED load
• 16V rated capacitor voltage used for 12V LED output
• During open LED condition, LED output voltage equals peak AC line voltage
so appropriately rated high voltage capacitor is necessary
• For residential LED bulb applications, high voltage output capacitors may not
be feasible due to their large size
• For LED loads that include open LED shunt protection, capacitor voltage
rating can be rated for clamped LED voltage (16V)
• 16V rated capacitor easily fits within residential Edison based LED bulb bases
18. www.fairchildsemi.com18
FL7701 OVP Output LED Voltage Clamp
• Recommended FL7701 configuration for LED loads that DO NOT include parallel open LED
shunt protection
• When LED voltage is greater than zener voltage, the BJT is turned on and discharges the VDD
capacitor
• LED voltage is now limited to the zener voltage allowing the use of low voltage output bulk
capacitor on LED output
AC input
85Vac~265Vac
LED
FUSE
FRD
Lm
C
VDD
HV
GND
FL7701
Varistor
N.C
Adim
R
RT
CS
GATE
EMI FILTER
R
C
R
R
D
ZD
C
OVP Protection
20. www.fairchildsemi.com20
FEBL031-2A LED Driver, THD
(Chroma 61502 Programmable AC Source)
0
0.002
0.004
0.006
0.008
0.01
0.012
0.014
0.016
0.018
3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Harmonic
Current(A)
Harmonic Number
FEBL031-2A Measured THD
EN61000-3-2, 115VAC
Measured Harmonic Current
Class C (Lighting) Limit
• FEBL031-2A, EMI filter not optimized resulting in AC line
current distortion
• Measured THD is close to Class C limits and could be
improved by optimizing EMI filter