參數(shù)資料
型號(hào)： CAT102
英文描述： Precision, Adjustable Shunt Regulator (600mV Reference)
中文描述： 精密，可調(diào)式并聯(lián)穩(wěn)壓器（600mV的參考）
文件頁數(shù)： 6/9頁
文件大?。?/td> 81K
代理商： CAT102
CAT102
6
Doc. No. 4007, Rev. L
VIN
3.3V
VOUT
0.6V/20mA
R3
IN
OUT
GND
FB
3
1
5
2
CAT102
VIN
3.3V
VOUT = (1+R1/R2) x 0.6V
1.2V/20mA
R3
IN
OUT
GND
FB
3
1
5
2
CAT102
R1
10k
R2
10k
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
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
1.0
μ
F 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:
V
OUT
= (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 V
is associated with R3 =
135
, and a 10V supply works best with R3 = 470
.
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
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