CAT102 데이터 시트보기 (PDF) - Catalyst Semiconductor => Onsemi

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CAT102

Precision, Adjustable Shunt Regulator (600mV Reference)

Catalyst Semiconductor => Onsemi 

CAT102

APPLICATIONS INFORMATION

The CAT102 adjustable shunt regulator features

isolated supply inputs and outputs, ideal for isolated

power-supply applications using an optocoupler in

the feedback path. The CAT102 sinks 20mA with

VOUT at 0.3V. The wide input supply range allows the

device to operate from 2.2V to 18V. The CAT102

compares the FB input to a precision 600mV

reference. If the FB input is low, the OUT pin sinks

no current. If FB rises above 600mV, the OUT pin

sinks up to 20mA.

Figure 1 shows the CAT102 configured as a shunt

regulator. To generate an output voltage of 0.6V, the

FB pin has to be directly connected to the OUT pin.

A 1.0µF capacitor from OUT to GND is recommen-

ded when the output voltage is 0.6V. A resistor-

divider connected from OUT to GND is used to

produce a higher output voltage as set by the

following equation:

VOUT = (1 + R1/R2) x 0.6V

The current limit can be adjusted by using a resistor R3

connected between the IN and OUT pins. For example,

a 3.3V supply VIN is associated with R3 = 135Ω, and a

10V supply works best with R3 = 470Ω. The CAT102

shunt regulator is limited to low-current applications with

the OUT pin capable of sinking up to 20mA max.

Figure 1. Application circuits for 0.6V output and 1.2V output voltages

VIN

3.3V

C1

0.1µF

R3

5 IN

OUT 3

CAT102

2

GND

1

FB

VOUT

0.6V/20mA

C2

1µF

VIN

3.3V

C1

0.1µF

R3

5

IN

3

OUT

CAT102

2

GND

1

FB

R1

10kΩ

R2

10kΩ

VOUT = (1 + R1/R2) x 0.6V

1.2V/20mA

C2

1µF

Doc. No. MD-4007 Rev. N

4

© Catalyst Semiconductor, Inc.

Characteristics subject to change without notice

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