點晶科技股½有限公司
SILICON TOUCH TECHNOLOGY INC.
PC112/PC113
General Description
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 type package.
Features
1.
2.
3.
4.
5.
Typical 85% efficiency
No external power switch
Low shutdown supply current
Low feedback voltage
Drives 6 white LEDs 20mA from working voltage 2.0V
6.
±
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.
2.
3.
4.
White LED Display Backlighting
Cellular Telephones
Personal Digital Assistant
Digital Cameras
5. Portable Machine
-1 -
Version
：
A.001
SITI [ SILICON TOUCH TECHNOLOGY INC. ]
