PC112 2.8-5V四倍升壓驅動20mA多顆LED恒流IC
PC112/PC113 is a compact, high-efficiency step-up DC-DC converter which drives 2-6 series white LEDs with constant current from 3V to 5V. Extremely low shutdown power supply current ensures the high efficiency of battery system. The PC113 works at 500KHz, allowing the application of tiny external components. Low feedback voltage and hence minimal input current from the battery extends battery life. Built-in N-channel power switches optimize the layout area of PCB. Since PC112/PC113 drives series LEDs, it regulates the light intensity uniformly. With a single external resistor or PWM signal, users can easily set the LED current and LED brightness.While output loading is open, likes the case of LEDs failure, the duty cycle of the DC-DC converter will increase rapidly, causing high output voltage to damage the circuit. To avoid this situation, a Zener diode should be connected to the DC-DC converter's output to clamp the output voltage in most applications. However, PC113 has built-in the over-voltage protection circuit to protect the output circuit and thus eliminates the need of the external Zener diode.
PC112/PC113 is also characterized of the soft-start feature, which limits the inrush current. It is available in Thin-SOT te package.
Features:1. Tical 85% efficiency 2. No external power switch; 3. Low shutdown supply current; 4. Low feedback voltage; 5. Drives 6 white LEDs 20mA from working voltage 2.0V; 6. &plun;4% LED output current accuracy; 7. Over voltage protection circuit build in(PC113); 8. Soft-start circuit build in; 9. Thin 6-pin SOT23-6 package
Application:1. White LED Display Backlighting; 2. Cellular Telephones; 3. Personal Dial Assistant; 4. Dial Cameras; 5. Portable Machine
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