# How to interface PWM output from a microcontroller with power MOSFET?

How to interface PWM output from a dsPIC30F6012 microcontroller with power MOSFET TrenchFET like SiE818DF? I want use PWM to control the brightness of the LEDs. Four PWM channels, one PWM per channel.

PWM frequency 244Hz
LED Voltage: 12V
Total operating current: 5A
1W LEDs with working current 350mA (4 banks of LED's)
Overcurrent protection on output of each channel.


Can TrenchFET be connected directly, or some matching IC circuits need be used?

• Read the required gate voltage for the FET and compare to what your microcontroller outputs. – Jarrod Christman Apr 8 '15 at 0:34
• What do you plan to do with the MOSFET? Will you be PWMing it? If so, at what frequency? A MCU's weak GPIO driver is generally incapable of high-frequency PWM as the limited drive current capability cannot charge/discharge the gate capacitance quickly. Also you may need to drive it to a higher voltage than the +5V max of the dsPIC to get the Rds(on) minimized. – Adam Lawrence Apr 8 '15 at 0:39
• @Adam Lawrence, MOSFET(TrenchFET) will be used to drive LEDs(12V, 1W). Yes, connecting PWM output to MOSFETs. PWM frequency I want 244Hz. – minto Apr 8 '15 at 20:14
• Put these details into your original question please. – Adam Lawrence Apr 8 '15 at 20:16