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  • 1. LM317 New Product Vishay formerly General Semiconductor 3-Terminal Adjustable Output Positive Voltage Regulators Pin Arrangement Description The LM317 is an adjustable 3-terminal positive voltage TO-263 regulator capable of supplying in excess of 1.5A over an (LM317CM) output voltage range of 1.2V to 37V. This voltage regulator 3 is exceptionally easy to use and requires only two external 2 3 1 resistors to set the output voltage. Further, it employs internal TO-220 2 current limiting, thermal shutdown and safe area compen-(LM317CT) 1 1. Adjust sation, making it essentially blow-out proof. 2. Vout 3. Vin Heatsink is connected to pin 2 Features • Output current in excess of 1.5 ampere Standard Application • Output adjustable between 1.2V and 37V Vin Vout • Internal thermal overload protection LM317 R1 • Internal short-circuit current limiting IADJ Adjust 240Ω constant with temperature Cin Co 0.1µF 1µF • Output transistor safe-area compensation R2 • Floating operation for high voltage applications • Eliminates stocking many fixed voltagesNotes:Cin is required if regulator is located an appreciable distance from powersupply filter. Mechanical DataCo is not needed for stability, however, it does improve transient response.Vout = 1.25V (1 + R2 / R1) + IAdj R2 Case: TO-220 and TO-263 packagesSince IAdj is controlled to less than 100µA, the error associated with this Weight: approx. 1.35gterm is negligible in most applications Case outlines are on the back page. Input Functional Block Diagram 3 + -- Voltage Protection Reference Circuitry Rlimit Vadj 2 1 OutputMaximum Ratings Ratings at 25°C ambient temperature unless otherwise specified.Parameter Symbol Value UnitInput-Output Voltage Differential Vi-Vo 40 VdcJunction-to-Case Thermal Resistance TO-220 3.0 RθJC °C TO-263 3.0Power Dissipation, 25°C Case Temperature PD 15 WOperating Junction Temperature Range TJ 0 to +125 °CStorage Junction Temperature Range Tstg –65 to +150 °CDocument Number 74809 www.vishay.com30-Oct-02 1
  • 2. LM317Vishayformerly General SemiconductorElectrical Characteristics – LM317Vi -Vo = 5V, Io = 0.5A, TJ = Tlow to Thigh (see Note 1), Imax and Pmax per Note 2, unless otherwise noted.Parameter Symbol Conditions Min. Typ. Max. UnitLine Regulation (Fig. 1) (3) TA = 25°C – 0.01 0.04 REG line %Vo/V3.0V ≤ VI – Vo ≤ 40V TJ = 0°C thru 125°C – 0.02 0.07Load Regulation (Fig. 2) (3) Vo ≤ 5.0 – 5 25 mV REG loadTJ = 25°C, 10mA ≤ Io ≤ 1.5A Vo ≥ 5.0 – 0.1 0.5 %VoLoad Regulation (Fig. 2) (3) Vo ≤ 5.0 – 20 70 mV REG load10mA ≤ Io ≤ 1.5A Vo ≥ 5.0 – 0.3 1.5 %VoThermal Regulation REG therm TJ = 25°C, 20ms Pulse – 0.03 0.07 %Vo/WAdjustment Pin Current (Fig. 3) IAdj – 50 100 µA 10mA ≤ IL ≤ 1.5AAdjustment Pin Current Change ∆IAdj – 0.2 5 µA 2.5V ≤ VI – Vo ≤ 40V 10mA ≤ Io ≤ 1.5AReference Voltage (Fig. 3) (4) Vref 1.225 1.25 1.275 V 3V ≤ VI – Vo ≤ 40VTemperature Stability (Fig. 3) TS Tlow ≤ TJ ≤ Thigh – 1 – %VoMin. Load Current to Maintain Regulation (Fig. 3) ILmin VI – Vo = 40V – 3.5 10 mA VI – Vo ≤ 15V 1.5 2.2 –Maximum Output Current (Fig. 3) Imax A VI – Vo = 40V, TJ = 25°C 0.15 0.4 –RMS Noise, % of Vo N TJ = 25°C, 10HZ ≤ f ≤ 10KHZ — 0.003 – %Vo Vo = 10V, f = 120HZ(5) — 65 –Ripple Rejection (Fig. 4) RR dB CAdj = 10µF 66 80 – TJ = 125°C(6), TJ = 25°C forLong-Term Stability (after 1000 hr) Fig. 3 S – 0.3 1.0 % Endpoint MeasurementsThermal Resistance Junction to Case RθJC Tlow ≤ TJ ≤ Thigh – 5.0 – °C/WNotes:(1) Tlow = 0°C Thigh = 125°C(2) Imax = 1.5A Pmax is internally limited(3) Load and line regulation are specified at constant junction temperature. Changes in Vo due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.(4) Selected devices with tightened tolerance reference voltage available.(5) CAdj, when used, is connected between the addjustment pin and ground.(6) Since Long-Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.www.vishay.com Document Number 748092 30-Oct-02
  • 3. LM317 Vishay formerly General Semiconductor Fig. 1 – Line Regulation Test Circuit Fig. 2 – Load Regulation and ∆Iadj /Load Test Circuit V V Line Regulation (%/V) = OH -- OL x100 Load Regulator (mV) = Vo(min. Load) -- Vo(max. Load) VOL Vo(min. Load) -- Vo(max. Load) Load Regulator (%Vo) = x100 Vo(min. Load) VIH VOH VIL VOL VOH (min. Load) Vin Vout VI Vin Vout VOL (max. Load) LM317 LM317 IL Adjust R1 240Ω Adjust R1 240Ω IADJ 1% IADJ 1% Co RL Cin RL Cin Co (min. 0.1µF 1µF Load) R2 0.1µF R2 1µF 1% 1% Pulse Testing Required: Pulse Testing Required: 1% Duty Cycle is Suggested 1% Duty Cycle is Suggested Fig. 3 – Standard Test Circuit Fig. 4 – Ripple Rejection Test Circuit 24V 14V f = 120HZ Vin Vout Vin Vout Vo = 10V LM317 IL LM317 *D1 Adjust R1 240 240 1N4002 1% Vref R1 1% IADJ Adjust Cin Co Cin Co VI 0.1µF RL Vo RL Vo 1µF ISET 0.1µF 1µF CAdj R2 R2 10µF 1% 1% To Calculate R2: Pulse Testing Required: Vo = ISET R2 + 1.250V *D1 Discharges CADJ if 1% Duty Cycle is Suggested Assume ISET = 5.25mA Output is Shorted to GroundDocument Number 74809 www.vishay.com30-Oct-02 3
  • 4. LM317Vishayformerly General SemiconductorRatings andCharacteristic Curves (T A = 25°C unless otherwise noted) Fig. 5 – Load Regulation Fig. 6 – Current Limit 0.6 4∆Vo -- Output Voltage Change (%) 0.4 0.2 3 Io -- Output Current (A) IL = 0.5A 0 TJ = 25°C --0.2 2 IL = 1.5A --0.4 TJ = 150°C TJ = --55°C VI = 15V --0.6 1 Vo = 10V --0.8 --1.0 0 --75 --50 --25 0 25 50 75 100 125 150 175 0 10 20 30 40 Fig. 7 – Adjustment Pin Current Fig. 8 – Dropout Voltage 75 3.0 IADJ -- Adjustment Pin Current (µA) 70 VI -- Vo -- Input -- Output Voltage ∆Vo = 100mV 65 2.5 Differential (Vdc) IL = 1.5A 60 55 2.0 IL = 1.0A 50 IL = 500mA 45 1.5 IL = 200mA 40 IL = 20mA 35 1.0 --75 --50 --25 0 25 50 75 100 125 150 175 --75 --50 --25 0 25 50 75 100 125 150 175 Fig. 9 – Temperature Stability Fig. 10 – Minimum Operating Current 1.260 5.0 4.5 Vref -- Reference Voltage (V) IO -- Quiescent Current (mA) 4.0 1.250 TJ = 25°C 3.5 TJ = --55°C TJ = 150°C 3.0 1.240 2.5 2.0 1.5 1.230 1.0 0.5 1.220 0 --75 --50 --25 0 25 50 75 100 125 150 175 0 10 20 30 40 50www.vishay.com Document Number 748094 30-Oct-02
  • 5. LM317 Vishay formerly General Semiconductor Ratings and Characteristic Curves (T A = 25°C unless otherwise noted) Fig. 11 – Ripple Rejection Fig. 12 – Ripple Rejection vs. Output Voltage vs. Output Current 100 140 CAdj = 10µF 120 80 RR -- Ripple Rejection (db) RR -- Ripple Rejection (db) 100 CAdj = 10µF Without CAdj 60 80 60 Without CAdj 40 VI -- Vo = 5V 40 VI = 15V 20 IL = 500mA Vo = 10V f = 120HZ 20 f = 120HZ TJ = 25°C TJ = 25°C 0 0 0 5 10 15 20 25 30 35 40 0.01 0.1 1 10 Vo -- Output Voltage (V) Io -- Output Current (A) Fig. 13 – Ripple Rejection vs. Frequency Fig. 14 – Output Impedance 100 101 VI = 15V 80 Vo = 10V RR -- Ripple Rejection (db) 100 IL = 500mA Output Impedance (Ω) TJ = 25°C CAdj = 10µF 60 Without CAdj 10--1 40 Without CAdj IL = 500mA 10--2 20 VI = 15V CAdj = 10µF Vo = 10V TJ = 25°C 0 10--3 10 100 1K 10K 100K 1M 10 100 1K 10K 100K 1M f -- Frequency (Hz) f -- Frequency (Hz) Fig. 15 – Line Transient Response Fig. 16 – Load Transient Response∆VI -- Input Voltage ∆Vo -- Output Voltage 3 Deviation (V) Vo -- Output Voltage 1.5 2 Deviation (V) 1.0 1 CL = 1µF CAdj = 10µF CL = 1µF CAdj = 10µF 0.5 0 0 --1 --0.5 Vo = 10V --2 IL = 50mA CL = 0 Without CAdj VI = 15V --1.0 --3 TJ = 25°C Vo = 10V Change (V) Current (A) INL = 50mA IL -- Load --1.5 CL = 0 1.5 Without CAdj TJ = 25°C 1.0 1.0 VI IL 0.5 0.5 0 0 0 10 20 30 40 0 10 20 30 40 t -- Time (µs) t -- Time (µs) Document Number 74809 www.vishay.com 30-Oct-02 5
  • 6. LM317Vishayformerly General Semiconductor TO-220 Case Outline 4.85 ± 0.375 10.25 ± 0.25 3.84 ± 0.6 Dia. 1.27 ± 0.12 2.69 ± 0.25 6.26 ± 0.25 14.8 ± 0.51 8.54 ± 0.26 28.7 ± 0.92 3.94 ± 0.375 13.9 ± 0.41 Dimensions in millimeters 2.53 1.3 ± 0.185 0.387 ± 0.09 ± 0.185 2.55 0.8 ± 0.12 ± 0.375 TO-263 Case Outline 10.29 4.47 1.65 1.27 20° 8.5 15.24 Seating Plane .10 8 ° Max. 2.54 2.54 0.8 0.6 Dimensions in millimeterswww.vishay.com Document Number 748096 30-Oct-02