Wednesday, April 3, 2013
Li Ion DRIVER WITH EXTERNAL PWM DIMMING ELECTRONIC DIAGRAM
Li-Ion DRIVER WITH EXTERNAL PWM DIMMING ELECTRONIC DIAGRAM
This boost converter is quite useful to improve conversion efficiency, reduce output ripple, and the use of small external components. In default, the LED current is set with external sensor resistor Rset, feed back voltage is regulated to 2000 miliVolts. During the operation, the current LED can be controlled using 1-wire digital interface through CTRL pin or with PWM signal that applied to the CTRL pin through the duty cycle. It determines the feedback reference voltage. The device also has a feature of integrated open LED protection that will disable the boost converter, this is to prevent the output from exceeding the absolute maximum ratings during open LED condition.
- L1: Murata LQH3NPN100NM0
- C1: Murata GRM188R61A105K
- C2: Murata GRM188R61E474K
- D1: ONsemi MBR0540T1
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