View LM317_521572.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LM317
New Product
Vishay
formerly General Semiconductor
3-Terminal Adjustable Output Positive Voltage Regulators
Pin Arrangement TO-263
(LM317CM)
2 3 3 1 1. Adjust 2. Vout 3. Vin
Heatsink is connected to pin 2
Description
The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of 1.5A over an output voltage range of 1.2V to 37V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow-out proof.
TO-220
(LM317CT)
1
2
Features
* Output current in excess of 1.5 ampere * Output adjustable between 1.2V and 37V
Standard Application
Vin Vout
LM317
Cin 0.1F IADJ R1 Adjust 240 R2 Co 1F
* Internal thermal overload protection * Internal short-circuit current limiting constant with temperature * Output transistor safe-area compensation * Floating operation for high voltage applications * Eliminates stocking many fixed voltages
Notes: Cin is required if regulator is located an appreciable distance from power supply filter. Co is not needed for stability, however, it does improve transient response. Vout = 1.25V (1 + R2/ R1) + IAdj R2 Since IAdj is controlled to less than 100A, the error associated with this term is negligible in most applications
Mechanical Data
Case: TO-220 and TO-263 packages Weight: approx. 1.35g Case outlines are on the back page.
Input 3
Functional Block Diagram
+ -Voltage Reference Protection Circuitry
Rlimit Vadj 1 2 Output
Ratings at 25C ambient temperature unless otherwise specified.
Maximum Ratings
Parameter
Symbol Vi-Vo TO-220 TO-263 RJC PD TJ Tstg
Value 40 3.0 3.0 15 0 to +125 -65 to +150
Unit Vdc C W C C
www.vishay.com 1
Input-Output Voltage Differential Junction-to-Case Thermal Resistance
Power Dissipation, 25C Case Temperature Operating Junction Temperature Range Storage Junction Temperature Range
Document Number 74809 30-Oct-02
LM317
Vishay
formerly General Semiconductor
Electrical Characteristics - LM317
Vi -Vo = 5V, Io = 0.5A, TJ = Tlow to Thigh (see Note 1), Imax and Pmax per Note 2, unless otherwise noted. Parameter Line Regulation (Fig. 1) (3) 3.0V VI - Vo 40V Load Regulation (Fig. 2) (3) TJ = 25C, 10mA Io 1.5A Load Regulation (Fig. 2) (3) 10mA Io 1.5A Thermal Regulation Adjustment Pin Current (Fig. 3) Adjustment Pin Current Change Reference Voltage (Fig. 3) (4) Temperature Stability (Fig. 3) Min. Load Current to Maintain Regulation (Fig. 3) Maximum Output Current (Fig. 3) RMS Noise, % of Vo Ripple Rejection (Fig. 4) Long-Term Stability (after 1000 hr)
Fig. 3
Symbol REG line
Conditions TA = 25C TJ = 0C thru 125C Vo 5.0 Vo 5.0 Vo 5.0 Vo 5.0 TJ = 25C, 20ms Pulse 10mA IL 1.5A 2.5V VI - Vo 40V 10mA Io 1.5A 3V VI - Vo 40V Tlow TJ Thigh VI - Vo = 40V VI - Vo 15V VI - Vo = 40V, TJ = 25C TJ = 25C, 10HZ f 10KHZ Vo = 10V, f = 120HZ(5) CAdj = 10F TJ = 125C(6), TJ = 25C for Endpoint Measurements Tlow TJ Thigh
Min. - - - - - - - - - 1.225 - - 1.5 0.15 -- -- 66 - -
Typ. 0.01 0.02 5 0.1 20 0.3 0.03 50 0.2 1.25 1 3.5 2.2 0.4 0.003 65 80 0.3 5.0
Max. 0.04 0.07 25 0.5 70 1.5 0.07 100 5 1.275 - 10 - - - - - 1.0 -
Unit %Vo/V mV %Vo mV %Vo %Vo/W A A V %Vo mA A %Vo dB % C/W
REG load
REG load REG therm IAdj IAdj Vref TS ILmin Imax N RR S RJC
Thermal Resistance Junction to Case
Notes: (1) Tlow = 0C Thigh = 125C (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 2
Document Number 74809 30-Oct-02
LM317
Vishay
formerly General Semiconductor Fig. 1 - Line Regulation Test Circuit
V V Line Regulation (%/V) = OH -- OL x100 VOL VIH VIL VOH VOL
Fig. 2 - Load Regulation and Iadj /Load Test Circuit
Load Regulator (mV) = Vo(min. Load) -- Vo(max. Load) Vo(min. Load) -- Vo(max. Load) Load Regulator (%Vo) = x100 Vo(min. Load) VOH (min. Load) VOL (max. Load) IL 240 1% Co R2 1% 1F
Vin
LM317
Vout 240 1%
VI
Vin
LM317
Vout
IADJ Cin 0.1F
Adjust R1
Co RL 1F
IADJ Cin 0.1F
Adjust R1
RL (min. Load)
R2 1%
Pulse Testing Required: 1% Duty Cycle is Suggested
Pulse Testing Required: 1% Duty Cycle is Suggested
Fig. 3 - Standard Test Circuit
24V 14V f = 120HZ
Fig. 4 - Ripple Rejection Test Circuit
Vin
LM317
Vout IL 240 1% Vref Co 1F ISET R2 1% RL Vo
Vin
LM317
Vout 240 1%
Vo = 10V
*D1
IADJ Cin VI 0.1F
Adjust R1
R1 Adjust Cin 0.1F R2 1%
1N4002 Co RL Vo
CAdj 10F
1F
Pulse Testing Required: 1% Duty Cycle is Suggested
To Calculate R2: Vo = ISET R2 + 1.250V Assume ISET = 5.25mA
*D1 Discharges CADJ if
Output is Shorted to Ground
Document Number 74809 30-Oct-02
www.vishay.com 3
LM317
Vishay
formerly General Semiconductor
Ratings and Characteristic Curves (TA = 25C unless otherwise noted)
Fig. 5 - Load Regulation
0.6 4
Fig. 6 - Current Limit
Vo -- Output Voltage Change (%)
0.4
0 --0.2
IL = 0.5A
Io -- Output Current (A)
0.2
3 TJ = 25C 2 TJ = 150C 1 TJ = --55C
IL = 1.5A --0.4 --0.6 --0.8 --1.0 --75 VI = 15V Vo = 10V
0 --50 --25 0 25 50 75 100 125 150 175 0 10 20 30 40
Fig. 7 - Adjustment Pin Current
75 3.0
Fig. 8 - Dropout Voltage
VI -- Vo -- Input -- Output Voltage Differential (Vdc)
IADJ -- Adjustment Pin Current (A)
70 65 60 55 50 45 40 35 --75
Vo = 100mV 2.5 IL = 1.5A 2.0 IL = 1.0A IL = 500mA 1.5 IL = 200mA IL = 20mA 1.0 --75
--50 --25
0
25
50
75
100 125 150 175
--50 --25
0
25
50
75
100 125 150 175
Fig. 9 - Temperature Stability
1.260 5.0 4.5
Fig. 10 - Minimum Operating Current
Vref -- Reference Voltage (V)
IO -- Quiescent Current (mA)
4.0 TJ = 25C 3.5 TJ = --55C 3.0 2.5 2.0 1.5 1.0 0.5 TJ = 150C
1.250
1.240
1.230
1.220 --75
0 --50 --25 0 25 50 75 100 125 150 175 0 10 20 30 40 50
www.vishay.com 4
Document Number 74809 30-Oct-02
LM317
Vishay
formerly General Semiconductor
Ratings and Characteristic Curves (TA = 25C unless otherwise noted)
Fig. 11 - Ripple Rejection vs. Output Voltage
100 CAdj = 10F 140 120
Fig. 12 - Ripple Rejection vs. Output Current
RR -- Ripple Rejection (db)
RR -- Ripple Rejection (db)
80 Without CAdj 60
100 80 60 40 20 0 0.01 VI = 15V Vo = 10V f = 120HZ TJ = 25C 0.1
CAdj = 10F
40 VI -- Vo = 5V IL = 500mA f = 120HZ TJ = 25C 0 5 10 15 20 25 30 35 40
Without CAdj
20
0
1
10
Vo -- Output Voltage (V)
Io -- Output Current (A)
Fig. 13 - Ripple Rejection vs. Frequency
100 101
Fig. 14 - Output Impedance
VI = 15V Vo = 10V IL = 500mA TJ = 25C
RR -- Ripple Rejection (db)
80 CAdj = 10F 60 Without CAdj
Output Impedance ()
100
10--1 Without CAdj 10--2 CAdj = 10F
40 IL = 500mA VI = 15V Vo = 10V TJ = 25C 100 1K 10K 100K 1M
20
0 10
10--3 10
100
1K
10K
100K
1M
f -- Frequency (Hz)
f -- Frequency (Hz)
VI -- Input Voltage Vo -- Output Voltage Change (V) Deviation (V)
Fig. 15 - Line Transient Response
3
Fig. 16 - Load Transient Response
Vo -- Output Voltage Deviation (V)
2 1 0 --1 --2 --3 CL = 0 Without CAdj VI = 15V Vo = 10V INL = 50mA TJ = 25C CL = 1F CAdj = 10F
1.5 1.0 CL = 1F CAdj = 10F 0.5 0 --0.5 --1.0 --1.5 1.0 0.5 0 0 10 20 30 40 VI Vo = 10V IL = 50mA TJ = 25C CL = 0 Without CAdj
IL -- Load Current (A)
1.5 1.0 0.5 0 0 10 20 30 IL
40
t -- Time (s) Document Number 74809 30-Oct-02
t -- Time (s) www.vishay.com 5
LM317
Vishay
formerly General Semiconductor
TO-220 Case Outline
4.85 0.375 1.27 0.12
10.25 0.25
3.84 0.6 Dia.
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 0.185
1.3 0.185 0.8 0.12
0.387 0.09 2.55 0.375
TO-263 Case Outline
10.29 1.65 20
4.47 1.27
8.5 15.24
Seating Plane .10
8 Max. 2.54 0.8 0.6
2.54
Dimensions in millimeters
www.vishay.com 6
Document Number 74809 30-Oct-02

▲Up To Search▲

Price & Availability of LM317

	To Download LM317 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .