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Curso electrónica analógica, tema reguladores de voltaje con IC 7805, 7812, 7912, 7905 y lm317 así como sus etapas como con filtro de capacitores, puente de diodos, reductor de tensión, linealización de señal, etc, el objetivo es que el alumno identifique las etapas de rectificación de la señal a través de una fuente de tensión diseñada por el mismo
https://www.udemy.com/vlsi-academy
http://vlsisystemdesign.com/noise_margin.php
Noise margin is the amount of noise that a CMOS circuit could withstand without compromising the operation of circuit. Noise margin does makes sure that any signal which is logic '1' with finite noise added to it, is still recognised as logic '1' and not logic '0'. It is basically the difference between signal value and the nosie value.
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Modulador de Ancho de Pulso en Fuentes ATX Sdc7500
1. Data sheet
January,2010 Rev1.0 1/7
○C 2012 Shaoxing Devechip Microelectronics Co.,Ltd www.sdc-semi.com
Voltage Mode PWM Controller SDC7500
General Description
The SDC7500 incorporates all the functions required in the construction of a pulse-width modulation switching circuit. Designed primarily for switching power supply control, it offers the systems engineer the flexibility to tailor control circuitry to its own application.
Applications
PC power supply
DC-DC convertor
Features
Complete PWM power control circuitry
Uncommitted outputs for 200mA sink or source current
Output control for single ended or push pull operation
Internal regulator provides a stable 5V reference supply with 5% tolerance
Adjustable deadtime control
Package: DIP-16
Pin Configuration
Figure 1. Pin Configuration
Pin Number
Pin Name
Function
1, 16
IN+
Amplifier positive input
2, 15
IN-
Amplifier negative input
3
COMP
Compensation pin
4
DEAD
Dead time control
5
CT
Oscillate capacitor pin, external timing capacitor
6
RT
Oscillate resistor pin, external timing resistor
7
GND
Ground
8, 11
C1, C2
Output transistor collector
2. Data sheet
January,2010 Rev1.0 2/7
○C 2012 Shaoxing Devechip Microelectronics Co.,Ltd www.sdc-semi.com
Voltage Mode PWM Controller SDC7500
9,10
E1, E2
Output transistor emitter
12
VCC
Power supply pin
13
CTRL
Output control pin
14
VREF
Reference pin
Table 1. Pin Configuration
Functional Block Diagram Figure 2. Functional Block Diagram
Absolute Maximum Ratings(NOTE:Stresses greater than those listed under Absolute Maximum Ratings may cause permanent damage to the device.)
Parameter
Symbol
Value
Unit
Power Supply Voltage VCC
Vcc
42
V
Amplifier Input Voltage
Vi
VCC+0.3
V
Collector Output Voltage
Vo
42
V
Collector Output Current
Ico
200
mA
Total Dissipation power
PD
1000
mW
Operating Temperature
Topr
-25~85
℃
Storage Temperature
Tstg
-65~150
℃
Table 2. Absolute Maximum Ratings
3. Data sheet
January,2010 Rev1.0 3/7
○C 2012 Shaoxing Devechip Microelectronics Co.,Ltd www.sdc-semi.com
Voltage Mode PWM Controller SDC7500
Electrical Characteristics(Vcc=15.0V, f=1KHz, Ta=25℃, unless otherwise specified.)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
REFERENCE SECTION
Output Voltage
Vref
Iref=1mA
4.90
5.00
5.10
V
Input Regulation
Delta_VV
VCC=7V~40V
2
25
mV
Output Regulation
Delta_VL
Iref=1mA~10mA
1
15
mV
Short-circuit Output Current
Isc
Vref=0V,Ta=25℃
55
mA
Output Voltage Change with Temperature
Delta_VT
ΔTA=MIN TO MAX
0.2
1
%
PWM SECTION
Input Threshold Voltage
Vth
DUTY=0
4
4.5
V
Input Sink Current
Isink
VPIN3=0.7V
0.3
0.7
mA
OSCILLATOR SECTION
Frequency
Fosc
CT=1nF RT=12KΩ
23
29
34
KHz
Standard Deviation of Frequency
Delta
ALL Value of CT RT TA constant
10
%
Frequency Change with Temperature
Delta_FT
TA=MIN TO MAX
12
%
Frequency Change with Voltage
Delta_FV
VCC=7V~40V
0.1
%
AMPLIFIER SECTION
Input Offset Voltage
Voffset
Vo(PIN3)=2.5V
2
10
mV
Input Offset Current
Ioffset
Vo(PIN3)=2.5V
25
250
nA
Input Bias Current
Ibias
Vo(PIN3)=2.5V
0.2
1
uA
Output Sink Current
Isink
VCOMP=0.5V
0.3
0.7
mA
Output Source Current
Isourse
VCOMP=3.5V
-2
mA
Common-mode Input Voltage Range
VI
VCC=7V~40V
-0.3~VCC
V
Open-loop Voltage Amplification
GV
ΔVo=0.5V~3.5V
70
95
dB
Unity-gain Bandwidth
Fband
800
KHz
Common-mode Rejection Ratio
Rrej
VCC=40V
65
80
dB
DEAD TIME CONTROL SECTION
Input Bias
Ibias
VI=0~5.25V
-2
-10
uA
Maximum Duty Cycle
Gv
VI(PIN4)=0
45
%
Input Threshold Voltage
Vth
DUTY=0
2.7
3.3
V
Input Threshold Voltage
Vth
DUTY=MAX
0
POWER CURRENT SECTION
Standby Supply Current
ICC1
VCC=15V
6
10
mA
Standby Supply Current
ICC
VCC=40V
9
15
mA
Average Supply Current
Iav
VPIN4=2V
7.5
mA
4. Data sheet
January,2010 Rev1.0 4/7
○C 2012 Shaoxing Devechip Microelectronics Co.,Ltd www.sdc-semi.com
Voltage Mode PWM Controller SDC7500
OUTPUT SECTION
Collector off-state Current
IC
VCE=40V
VCC=40V
2
100
uA
Emitter off-state Current
IE
VCC=VC=40V
VE=0
-100
uA
Common-emitter
Vsat
VE=0,IC=100mA
1.0
1.3
V
Collector-emitter Saturation Voltage
Emitter-follower
Vsat
VC=15V
IE=-100mA
1.5
2.5
V
Output Control Input Current
Ii
VI=Vref
3.5
mA
SWITCHING CHARACTERISTICS
Output Voltage Rise Time
Tr
100
200
ns
Output Voltage Fall Time
Tf
Common-emitter
configuration
25
100
ns
Output Voltage Rise Time
Tr
100
200
ns
Output Voltage Fall Time
Tf
Emitter-follower
configuration
40
100
ns
Table 3. Electrical Characteristics
Typical Performance Characteristics
Figure 3. oscillator frequency and frequency Figure4. amplifier voltage amplification
variation VS timing resistance