Re: 4420 driver ICs

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

You also need at least a 10uF tantalum on the Vcc rail for good operation
right next to the Vcc pin on the driver chips.
When the driver turns on and tries to charge the MOSFET gate, most of the
energy required to charge the gate, will come
from that 10uF capacitor through hopefully a very low inductance path from
the driver chip to the gate.


Dan



 >  > Have you added the proper capacitors between ground and Vcc/Vdd right
 >  > next to the chip? 1 electrolytic + some ceramics or plastic caps?
 >  > Depending on your board layout, leaving out those local RF decoupling
caps
 >  > on the supply rails can lead to really nasty spikes on the
 >  > chip when it
 >  > 'runs', could be high enough to zap them
 >
 > Hmmmmmmmmmmmm.....Well i have it powered by a regulator...Does it still
 > need the caps?What values?
 >
 > Matt
 >
 >
 >
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