SC431CS-2 datasheet(5/6 Pages) SEMTECH

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SC431

652 MITCHELL ROAD NEWBURY PARK CA 91320

ADJUSTABLE SHUNT REGULATOR

April 13, 1998

TYPICAL CHARACTERISTICS (Cont.)

Test Circuit For Small-Signal

Gain and Phase Shift

APPLICATION CIRCUIT

Notes for Application Circuit:

1) Set V

OUT according to the following equation:

2) Choose the value for R as follows:

•

The maximum limit for R should be such that the

cathode current, I

Z, is greater than the minimum

operating current (100µA) at V

IN(min).

•

The minimum limit for R should be such that I

does not exceed 150mA under all load conditions,

and the instantaneous turn-on value for I

Z does not

exceed 200mA. Both of the following conditions

must be met:

(to limit instantaneous turn-on I

(to limit I

Z under normal

operating conditions)

REF

OUT











 +

200

(max)

min ≥

150

(min)

OUT

(max)

min

−

≥

-20

-10

1.0E+02

1.0E+03

1.0E+04

1.0E+05

1.0E+06

f (Hz)

-630

-585

-540

-495

-450

-405

-360

-315

-270

-225

-180

IZ = 10mA

TA = 25°C

Small-Signal Gain and Phase Shift

vs. Frequency

0.01

0.1

100

1.0E+03

1.0E+04

1.0E+05

1.0E+06

1.0E+07

f (Hz)

IZ = 10mA

TA = 25°C

Reference Impedance

vs. Frequency

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