LM317完美替换型号YW-UTC317

YW--UTC317

3-TERMINAL 1A POSITIVE ADJUSTABLE VOLTAGE REGULATOR

DESCRIPTION

The UTC317

is an adjustable 3-terminal positive

voltage regulator designed to supply more than 1.5A of output current with voltage adjustable from 1.3V to 37V

FEATURES

*Output current up to 1.5A

*Output voltage adjustable from 1.3V

to 37V *Internal short circuit protection

*Internal over temperature protection

*Safe-Area compensation for output transistor

TO-220

1

1:ADJ;2:OUTPUT;3:INPUT

BLOCK DIAGRAM

VAdj

ABSOLUTE MAXIMUN RATINGS

Ta=25°C,UNLESS OTHERWISE SPECIFIED

PARAMETERS

SYMBOL

RATING

UNITS

Input -Output Voltage Difference V I -V O 40V

Lead Temperature T LEAD 230°C

Power Dissipation

P D Internal limited

ü

Operating Temperature Range T OPR 0~+125°C Storage Temperature Range

T STG

-65~+150

°C

ELECTRICAL CHARACTERISTICS

V I-V O=5V,0°C

Parameter Symbol Test conditions Min Typ Max Unit Line Regulation?V O Ta=25°C,3V≤V I-V O≤40V0.010.04%/V

Ta=0ü125°C,3V≤V I-V O≤40V0.020.07

Ta=25°C V O≤6V1825mV Load Regulation?V O10mA≤I O≤I MAX V O≤5V0.40.5%/V O

10mA≤I O≤I MAX V O≤5V4070mV

V O≤6V0.8 1.5%/V O Adjustable Pin current I ADJ46100μA

Adjustable Pin Current

Change ?IADJ 2.5V≤V I-V O≤40V,

10mA≤Io≤I MAX,P D≤P MAX

2.05μA

Reference Voltage V REF3V≤V I-V O≤40V,

10mA≤I O≤I MAX,P D≤PMAX

1.20 1.25 1.30V

Temperature Stability STT0.7%/V O Minimum Load Current

for regulation

I L(MIN)V I-V O=40V 3.510mA

Maximum output

Current

I O(MAX)V I-V O≤15V,P D≤P MAX 1.5 2.2A

V I-V O≤15V,P D≤P MAX,Ta=25°C0.150.4 RMS Noise v.s.

%of Vout

eN T A=25°C,10H Z≤f≤10KH Z0.0030.01%/V O Ripple Rejection RR V O=10V,f=120HZ,C ADJ=060dB

V O=10V,f=120HZ,C ADJ=10μF6675

Long-term Stability,

T J=T HIGH

ST T A=25°C,1000hr0.31%

Junction to Case

Thermal Resistance

RθJC5°C/W Note:Testing with low duty pulse should be used to avoid heating effect.

317

TYPICAL CHARACTERISTICS PERFORMANCE

Temperature O u t p u t V o l t a g e D e v i a t i o n

Fig.1.Load Regulation vs

temperature

-50

-250255075100125

3540

45

50

55

60

Fig.2Adjustment Current vs Temperature

A d j u s t m e n t C u r r e n t

Temperature

Fig.3.Dropout Voltage vs Input-Temperature I n p u t -O u t p u t V o l t a g e D i

f f e r e n c e

R e f e r e n c e V o l t a g e

Temperature

TYPICAL APPLICATION CIRCUITS

Fig.5Programmable voltage regulator

Fig.6Regulator with On-off control

Vo=1.25V*(1+R2/R1)+Iadj*R2

C1is required when regulator is located an appreciated distance from power supply.Co is needed to improve transient response.

317

Iomax=(

Vref

R1

)+Iadj=

1.25V

R1

Iomin=(

Vref

R1+R2

)+Iadj=

1.25V

R1+R2

5mA

317