CAT102 Просмотр технического описания (PDF) - ON Semiconductor
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CAT102 Datasheet PDF : 8 Pages
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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 20 mA with
VOUT at 0.3 V. The wide input supply range allows
the device to operate from 2.2 V to 18 V. 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 600 mV, the OUT
pin sinks up to 20 mA.
Figure 1 shows the CAT102 configured as a shunt
regulator. To generate an output voltage of 0.6 V,
the FB pin has to be directly connected to the OUT
pin. A 1.0 µF capacitor from OUT to GND is
recommended when the output voltage is 0.6 V. 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 0.6 V
The current limit can be adjusted by using a resistor R3
connected between the IN and OUT pins. For example,
a 3.3 V supply VIN is associated with R3 = 135 Ω, and a
10 V supply works best with R3 = 470 Ω. The CAT102
shunt regulator is limited to low-current applications with
the OUT pin capable of sinking up to 20 mA max.
Figure 1. Application circuits for 0.6 V output and 1.2 V 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. P
4
© 2009 SCILLC. All rights reserved.
Characteristics subject to change without notice
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