3-TERMINAL ADJUSTABLE REGULATORS LM317 adjustable 3-terminal posi

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3-TERMINAL ADJUSTABLE REGULATORS LM317 adjustable 3-terminal posi

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LM317
3-TERMINAL ADJUSTABLE REGULATORS
LM317 adjustable 3-terminal positive-voltage regulators capable supplying 1.5A over differential voltage range 40V. They exceptionally easy require only external resistors output voltage. Both input output regulation better than standard fixed regulators. addition higher performance than fixed regulators, these regulators offer full overload protection available only integrated circuits. Included chip current limit, thermal overload protection, safe-area protection. overload protection circuit remains fully functional even adjustment terminal disconnected. Normally, capacitors needed unless device situated from input filter capacitors which case input bypass needed. optional output capacitor added improve transient response. primary applications each these regulators that programmable output regulator, connecting fixed resistor between adjustment terminal output terminal, each device used precision current regulator. Even though regulator floating sees only input-to-output differential voltage, these devices regulate output voltages that would cause maximum-rated differential voltage exceeded output became shorted recommended
TO-220 PACKAGE LM317T
FEATURES
Output Voltage Range Adjustable from Output Current Capability 1.5A Input Regulation Typically 0.01% Input-Volt Change Output Regulation Typically 0.1% Peak Output Current Constant over Temperature Range Regulator Popular 3-Lead TO-220 Package Ripple Rejection Typically
INPUT OUTPUT ADJUSTMENT
INPUT OUTPUT
TO-92
LM317LZ
ABSOLUTE MAXIMUM RATINGS
Input-Output Voltage Differential Operating Junction Temperature Range Continuous total dissipation free-air temperature Continuous total dissipation below case temperature Storage Temperature Lead Temperature1.6 from case seconds
+125 2000mW +150
RECOMMENDED OPERATING CONDITIONS
OUTPUT CURRENT, OPERATING VIRTUAL JUNCTION TEMPERATURE,TJ UNIT 1500
Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: wsccltd@hkstar.com
LM317
3-TERMINAL ADJUSTABLE REGULATORS
ELECTRICAL CHARACTERISTICS
Uniess otherwise noted ,these specifications apply following test conditions: Vi-Vo=5V Io=0.5A. conditions shown MAX, appropriate value specified under recommended operating conditions.
PARAMETER
Input Regulation*2 Ripple Rejection
TEST CONDITIONS
VI-VO=3V TJ=MIN IO=10mA 1.5A
0.01 0.02 0.003 0.15 1.20 1.25 0.04 0.07
UNIT
Output Regulation
Output Voltage Change With Temperature Output Voltage long-term Drift*4 Output Noise Voltage Minimum Output Current Maintain VI-VO=40V Regulation VI-VO15V Peak Output Current VI-VO40V, TJ=25 Adjustment-terminal Current VI-VO=2.5V 40V, Change adjustment-terminal Current IO=10mA 1.5A VI-VO=3V 40V, IO=10mA 1.5A, Reference Voltage(Output ADJ) P15W
VO=10V, f=120HZ VO=10V, f=120HZ 10-µF capacitor between ground IO=10mA 1.5A, VO5V TJ=25*3, VO>5V VO5V IO=10mA 1.5A VO>5V TJ=MIN After 1000h VI-VO=40V f=10Hz 10kHz, TJ=25
1.30
characteristics measured with 0.1-µF capacitor across input 1-µF capacitor across output. Input regulation expressed here percentage change output voltage change input Pulse testing techniques used maintain junction temperature close ambient temperature possible. Thermal effects must taken into account separately. Since long-term drift cannot measured individual devices prior shipment. This specification intended guarantee warranty. engineering estimate average drift expected from lot.
TYPICAL APPLICATION DATA
Note
C1=0.1
C2=1
Note
Note
Output voltage calculated from
VREF
input bypass capacitor recommended regulator from filter capacitors. output capacitor improves transient response optional. VREF equals difference between output adjustment terminal voltages.
LM317
3-TERMINAL ADJUSTABLE REGULATORS
POSITIVE ADJUSTABLE REGULATOR
Chip Size: 2.45X1.85mm
LOCATION LM317
NAME OUTPUT INPUT OUTPUT COORDINATES 2120 1730 1490 1120

3-TERMINAL ADJUSTABLE REGULATORS LM317 adjustable 3-terminal posi

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