Princeton Technology Corporation

Shih-Chou Kuo

Ming-Yuan Tsao

Chiung-Hung Chen

Ko-Han Chen

Mean-Sea Tsay

Dang-Ching Lin

An LED driving device has a first constant current source circuit and a voltage control circuit. The first constant current source outputs a first constant current to a first node and the first constant current flows into a first LED module disposed between a driving node and the first node; wherein, the first constant current source circuit has a first detection node for generating a first detection signal in response to the voltage level of the first node. The voltage control circuit is coupled to the first detection node, for outputting a control signal in response to the first detection signal to a voltage regulator circuit in order to control and modulate the voltage regulator circuit to output a driving voltage to the driving node.

LED driving device

A power-on reset circuit has a first impedance device, a first switch device, a first capacitor, a second switch device, a third switch device, a fourth switch device, a second impedance device, a second capacitor, and a control circuit coupled to a reset input terminal of a circuit device. When the power-on reset circuit is supplied with electric power, the first switch device and the third switch device are turned on and the second switch device and the fourth switch device are turned off. When the electric power is removed from the power-on reset circuit, the first switch device and the third switch device are turned off and the second switch device and the fourth switch device are turned on. The second capacitor is discharged through the fourth switch to a voltage level being close to a ground voltage.

Growing community of inventors

Taipei, Taiwan

Shih-Chou Kuo