I setup a IRF3205 half-bridge driver driven by my single 555 PWM to the Lin and Hin pins. The output for the low works as intended. For the high output I calculated the boot strap cap close to where it should be even tried a few values up and down. I used a 4001 Diode and tried some 4183s (I think) that where in my junk box, (testing circuit with 5khz signal). The output waveform didn't even resemble a square wave. At this point I removed the mosfet from the driver and hooked ran the high output through a diode and resistor to charge a capacitor up and measure its voltage. I'm getting a 6.58v output. Ironically this is the exact same voltage that is going into the HIN and LIN pins from my 555. The boost strap effect is not working and I'm not sure why. The driver and 555 is being driven by a 12V regulated supply and I verified 12V to the inputs of each chip.
I'm probably going to be asked for a schematic? The 555 is trivial and proven with my other PWM circuit, and the half bridge driver was hooked up with the addition of a diode and cap for the boost strap and thats it.
I couldn't find a half bridge driver in Eagle or electronics workbench, so maybe you can give me suggestions on how to create a schematic if you need one?
tnx
I'm probably going to be asked for a schematic? The 555 is trivial and proven with my other PWM circuit, and the half bridge driver was hooked up with the addition of a diode and cap for the boost strap and thats it.
I couldn't find a half bridge driver in Eagle or electronics workbench, so maybe you can give me suggestions on how to create a schematic if you need one?
tnx