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CAT102 データシート(PDF) 5 Page - Catalyst Semiconductor

部品番号 CAT102
部品情報  Precision, Adjustable Shunt Regulator
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メーカー  CATALYST [Catalyst Semiconductor]
ホームページ  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT102 データシート(HTML) 5 Page - Catalyst Semiconductor

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CAT102
© 2007 Catalyst Semiconductor, Inc.
5
Doc. No. 4007 Rev. M
Characteristics subject to change without notice
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
CAT102
IN
GND
C1
VIN
3.3V
0.6V/20mA
VOUT
0.1µF
C2
1µF
OUT
FB
R3
3
1
5
2
3
1
5
2
CAT102
IN
GND
C1
VIN
3.3V
1.2V/20mA
VOUT = (1 + R1/R2) x 0.6V
0.1µF
C2
1µF
OUT
FB
R1
10kΩ
10kΩ
R2
R3


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