Light-emitting diode drive circuit and transistor switching module thereof

Abstract

The invention uses a voltage clamping element to clamp the potential of the drain of the metal-oxide semiconductor transistor to reduce the voltage resistant demand of the metal-oxide semiconductor transistor, when the metal-oxide semiconductor transistor used for controlling the current of the light-emitting diode module is cut off. Therefore, the cost of the light-emitting diode drive device can be greatly reduced and the power consumption of the metal-oxide semiconductor transistor can also be reduced, thus increasing the efficiency of the entire circuit.

Description

technical field [0001] The present invention relates to a transistor switch module and a light-emitting diode drive circuit using the transistor switch module, in particular to a transistor switch module with voltage clamping function and a light-emitting diode drive circuit using the transistor switch module. Background technique [0002] Please refer to figure 1 , is a known light-emitting diode driving device. The LED driving device includes a dimming control unit 10 , an error amplifier 15 , an NMOS transistor 20 , a power supply 25 , an LED module 30 and a current detection resistor R. The power supply 25 is coupled to one end of the LED module 30 to provide a driving voltage to drive the LED module 30 to emit light. The NMOS transistor 20 is coupled to the other end of the LED module 30 , and controls the magnitude of the current flowing through the LED module 30 according to a switch control signal. The current detection resistor R is coupled to the NMOS transistor...

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Problems solved by technology

The rise of the gate-to-source capacitance (Cgs) also causes the error amplifier 15 to have a high driving capability to drive the NMOS transistor 20

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