APL431LADC-TB データシートの表示（PDF） - Anpec Electronics

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APL431LADC-TB

Low Voltage Adjustable Precision Shunt Regulator

Anpec Electronics 

APL431L

Test Figures (Cont.)

VIN

R1

IREF

Vo

IK

R2

VREF

Application Schematic

Precision Voltage Reference

RB

V IN

R1

VREF

R2

Vo

0.1µ F

Figure 2. Test Circuit for VKA>VREF,

VO= VKA= VREF× (1+R1/R2) + IREF × R1

Precision High-Current Series Regulator

V IN

Vo

RB

R1

0.1µ F

VREF

R2

Copyright  ANPEC Electronics Corp.

Rev. B.8 - Mar., 2005

Notes for Application Circuits:

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

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 (80µA) at V . IN(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:

R ≥ B,Min

VIN(MAX)

150mA

(to

limit

instantaneous

turn-on

lK)

R ≥ V -V B,Min

IN(MAX) OUT

lOUT(MIN)+100mA

(to limit lK under normal operating conditions)

4

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