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

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CAT102
(Rev.:RevL)

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 V

OUT

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 recommended

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.

VIN

3.3V

R3

5 IN

OUT 3

2 GND

CAT102

FB 1

VOUT

0.6V/20mA

VIN

3.3V

R3

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

5 IN

OUT 3

1.2V/20mA

2 GND

CAT102

R1

10k

FB 1

R2

10k

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

Doc. No. 4007, Rev. L

6

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