PC112 2.8-5V四倍升壓驅(qū)動(dòng)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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