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SC431CSK-5

ADJUSTABLE SHUNT REGULATOR

Semtech Corporation 

ADJUSTABLE SHUNT REGULATOR

SC431

April 13, 1998

TYPICAL CHARACTERISTICS (Cont.)

Small-Signal Gain and Phase Shift

vs. Frequency

80

70

60

50

40

30

20

10

0

-10

-20

1.0E+02

1.0E+03

1.0E+04

f (Hz)

IZ = 10mA

TA = 25°C

-180

-225

-270

-315

-360

-405

-450

-495

-540

-585

1.0E+05

-630

1.0E+06

100

IZ = 10mA

TA = 25°C

10

Reference Impedance

vs. Frequency

Test Circuit For Small-Signal

Gain and Phase Shift

1

0.1

0.01

1.0E+03

1.0E+04

1.0E+05

f (Hz)

APPLICATION CIRCUIT

1.0E+06

1.0E+07

Notes for Application Circuit:

1) Set VOUT according to the following equation:

VOUT

= VREF

1 +



R1

R2





+

IREF

R1

2) Choose the value for R as follows:

• The maximum limit for R should be such that the

cathode current, IZ, is greater than the minimum

operating current (100µA) at VIN(min).

• The minimum limit for R should be such that IZ

does not exceed 150mA under all load conditions,

and the instantaneous turn-on value for IZ does not

exceed 200mA. Both of the following conditions

must be met:

R min

≥

VIN (max)

200 mA

(to limit instantaneous turn-on IZ)

R min

≥ VIN(max) − VOUT

IOUT (min) + 150 mA

(to limit IZ under normal

operating conditions)

© 1998 SEMTECH CORP.

5

652 MITCHELL ROAD NEWBURY PARK CA 91320

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