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Class D Switching Power Amplifiers and Power D/A conversion

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Old 12th January 2005, 11:31 AM   #41
Kenshin is offline Kenshin  China
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the charging current is big-- 47K pull down may be not enough.

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Originally posted by classd4sure


I'm pretty sure you'll see some pull down resistors on the gates to prevent this from happening. In fact I think it's mentioned in one of the posts here.
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Old 12th January 2005, 01:07 PM   #42
Kenshin is offline Kenshin  China
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is this high side driver allright?
(delay is controlled by other logic circuits.)
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Old 12th January 2005, 02:18 PM   #43
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Quote:
Originally posted by Kenshin
is this high side driver allright?
(delay is controlled by other logic circuits.)
Don't know, have you simulated this?

The bootstrap looks OK

Your level shift will invert the signal (maybe this is OK depends on the circuit I guess).

Is that diode a baker clamp? What's going to happen when you stick an inductor on the output and it needs to switch the low side mosfet on? It seems like the freewheeling current during the deadtime period could try to hold the high side mosfet on at the same time, or turn it back on, the body diode might shunt all this kick away, it might not, not a gamble I'd want to make.
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