APL431L datasheet(4/15 Pages) ANPEC

4 / 15 page

 ANPEC Electronics Corp.

Rev. B.8 - Mar., 2005

APL431L

www.anpec.com.tw

Test Figures (Cont.)

Figure 2. Test Circuit for V

KA>VREF,

O= VKA= VREF× (1+R1/R2) + IREF × R1

VIN

IREF

VREF

Application Schematic

V o

VIN

0.1

µ F

R 2

R 1

VREF

R B

Precision Voltage Reference

V o

V IN

0.1

µ F

VREF

Precision High-Current Series Regulator

Notes for Application Circuits:

1) To improve the stability of output voltage, a 0.1

µF

capacitor between cathode and anode of

APL431L is strongly recommended.

2)Set VOUT according to the following equation:

VOUT = VREF(1+R1/R2)+lREF R1

3)Choose the value for RB as follows:

A)The maximum limit for RB should be such that

the cathode current(lK) is greater than the mini

mum operating current (80

µA) at VIN(MIN).

B)The minimum limit for RB should be such that

the cathode current (lK) does not exceed 100mA

under all load conditions, and the instantaneous

turnon value for lk does not exceed 150mA. Both

of the following conditions must. be met:

VIN(MAX)

150mA

VIN(MAX)-VOUT

lOUT(MIN)+100mA

(to limit instantaneous turn-on lK)

RB,Min

≥

(to limit lK under normal operating conditions)

RB,Min

≥

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