Hi all,
I'm trying to make a DC/AC inverter using a MOSFET H-bridge and an INTERSIL ISL83204A full bridge driver IC. So far I've almost got the circuit to work - three of the outputs form square waves, but one of the high side outputs (BHO) won't turn off.
While the three working outputs alternate between 0V and around 15V, the fourth just stays at about 10V - not fully on, but high enough to cause the MOSFET to turn on and short circuit the power supply.
I'm assuming it doesn't get to 15V because there's no 'off' state to power the bootstrap circuit, but I can't work out why it won't turn off.
It seems odd that only one output is misbehaving. Can anyone think of a reason why this would happen, or does it sound like the driver IC is faulty?
Any help much appreciated.
Matt
I'm trying to make a DC/AC inverter using a MOSFET H-bridge and an INTERSIL ISL83204A full bridge driver IC. So far I've almost got the circuit to work - three of the outputs form square waves, but one of the high side outputs (BHO) won't turn off.
While the three working outputs alternate between 0V and around 15V, the fourth just stays at about 10V - not fully on, but high enough to cause the MOSFET to turn on and short circuit the power supply.
I'm assuming it doesn't get to 15V because there's no 'off' state to power the bootstrap circuit, but I can't work out why it won't turn off.
It seems odd that only one output is misbehaving. Can anyone think of a reason why this would happen, or does it sound like the driver IC is faulty?
Any help much appreciated.
Matt