Hi All,
I'm having a go at building a class D audio amp that uses an IR2110 MOSFET driver. It's based on the IRAUDAMP1 reference design and the full circuit can be found here: How to Build a Class-D Power Amp - Projects
So far, without the MOSFETs plugged in, everything appears to be working nicely until the output stage, where the low output side is oscillating nicely but the high output is DC. My understanding is that this is expected - both MOSFETs must be attached for IR2110 bootstrapping to work.
My question is how can output side be methodically tested?
In other words, how can I test the difference between something being actually wrong with the input side or IR2110 itself versus an output driver problem? Both scenarios can result in a short circuit for at least 50% of the duty cycle. This is what I'm getting and I've crept up the OCP on my power supply to about 80mA per rail - as far as I'd like. Is there some other sink I can use that does not risk a short? MOSFETs tested out fine, btw (well, not the first pair 😉)
I'm having a go at building a class D audio amp that uses an IR2110 MOSFET driver. It's based on the IRAUDAMP1 reference design and the full circuit can be found here: How to Build a Class-D Power Amp - Projects
So far, without the MOSFETs plugged in, everything appears to be working nicely until the output stage, where the low output side is oscillating nicely but the high output is DC. My understanding is that this is expected - both MOSFETs must be attached for IR2110 bootstrapping to work.
My question is how can output side be methodically tested?
In other words, how can I test the difference between something being actually wrong with the input side or IR2110 itself versus an output driver problem? Both scenarios can result in a short circuit for at least 50% of the duty cycle. This is what I'm getting and I've crept up the OCP on my power supply to about 80mA per rail - as far as I'd like. Is there some other sink I can use that does not risk a short? MOSFETs tested out fine, btw (well, not the first pair 😉)