Chengdu Monolithic Power Systems Co., Ltd.

Shufa Jiang

Bo Yu

Junxin Tan

Bairen Liu

Li Yang

Taofeng Li

A short to ground protecting circuit for an LED driver for providing a power supply voltage for N LED strings. The LED driver has an output terminal for providing a power supply voltage for the N LED strings and N feedback terminals having N detecting voltages respectively. For each i from 1 to N, the iLED string is coupled between the output terminal and the ifeedback terminal, and the ifeedback terminal is configured to have the idetecting voltage. The short to ground protecting circuit receives a short threshold voltage and N open fault signals, and generates N short indicating signals. And on the premise of the iopen fault signal is valid, and if the idetecting voltage is less than the short threshold voltage for a preset time period, the ishort indicating signal is valid.

Short to ground and open protecting circuit, and associated protecting method

A control circuit of a power converter providing at least a first output voltage and a second output voltage, having: a first loop control circuit, configured to provide a first error amplifying signal based on the first output voltage and a first reference voltage; a second loop control circuit, configured to provide a second error amplifying signal based on the second output voltage and a second reference voltage; a saturation detecting circuit, configured to provide a saturation indicating signal based on the first error amplifying signal and a saturation reference signal; and a first current source circuit, configured to charge an output terminal of the second error amplifier based on the saturation indicating signal.

Single stage multi-outputs circuit and a method thereof

A short protecting circuit for a LED (Light-emitting Diode) driver for powering a plurality of LED strings, having: a short comparing circuit, configured to provide a plurality of short fault indicating signals; a first logic circuit, configured to provide a short fault signal based on the plurality of short fault indicating signals to indicate a short fault condition; a timing circuit, configured to provide a short protecting enable signal; and a second logic circuit, configured to provide a plurality of short isolating signals; wherein the short isolating signals are blocked when an open fault signal is valid.

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Chengdu, China

Shufa Jiang