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CAT102 データシート(PDF) 6 Page - Catalyst Semiconductor |
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CAT102 データシート(HTML) 6 Page - Catalyst Semiconductor |
6 / 9 page 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 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 1.0 µF 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 IN is associated with R3 = 135 Ω, 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 |
同様の部品番号 - CAT102 |
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同様の説明 - CAT102 |
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