I am using an Arduino UNO R3 to generate a PWM signal, the user sets the duty cycle using the serial monitor. The Arduino output signal is correct, but when the signal is connected to the input of the gate driver IC (IR2104) the low side driver output shows the signal with the compliment of the duty cycle (1-D)? why? I am using this IC to drive an IRFZ44N MOSFET.
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2 Answers
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The datasheet shows on page 4, under "lead defintions":
IN: Logic input for high and low side gate driver outputs (HO and LO), in phase with HO
In addition, the functional block diagram shows the input for the low side driver being inverted.
Thus, when IN is high, the top side MOSFET is on and the bottom one is off.
answered Dec 26, 2020 at 11:48
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when the signal is connected to the input of the gate driver IC (IR2104) the low side driver output shows the signal with the compliment of the duty cycle (1-D)? why?
That's what this chip produces: -
answered Dec 26, 2020 at 12:05