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CAT102 データシート(PDF) 5 Page - Catalyst Semiconductor |
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CAT102 データシート(HTML) 5 Page - Catalyst Semiconductor |
5 / 9 page 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 |
同様の部品番号 - CAT102 |
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同様の説明 - CAT102 |
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