Patent ID: 8058818
Filing Date: 2011-11-15
Classification: H03K,H05B,Y02B

Abstract:
1. A MOSFET switch module, comprising: a transistor switch, which has a control terminal, a first terminal, and a second terminal, in which the first terminal is coupled to an LED module; a dimmer control unit, coupled to the control terminal of the transistor switch, the dimmer control unit includes a multiplexer, an error amplifier, and a filter circuit, wherein the multiplexer receives a first reference signal, a second reference signal, and a dimmer signal, and according to the dimmer signal selects either the first reference signal or the second reference signal for output, so as to control the amount of current flowing through the transistor switch, the error amplifier controls the transistor switch according to the voltage level of the second terminal and the reference signal outputted by the multiplexer, and filter circuit is coupled between the multiplexer and the error amplifier, so as to filter the noise of the reference signal outputted by the multiplexer; and a voltage clamping unit, coupled to the first terminal of the transistor switch, so that the voltage difference between the first terminal and the second terminal is less than a preset voltage value.