Buck converter, controller riding on the switch node
- From: Klaus Kragelund <klauskvik@xxxxxxxxxxx>
- Date: Fri, 16 Jan 2009 06:06:25 -0800 (PST)
Hi
Well, a typical buck converter with current mode control has a PWM
controller referenced to output ground, a current sense transformer to
bring down the current sense signal and a pulse transformer to level
shift the gate signal.
Another approach is the one from Fairchild with an integrated solution
riding on the switch node:
http://www.electronicsdesign.dk/tmp/AN2544_ViperInBuckMode3.pdf
To be independant on single source parts, I would like to do the same
with the standard PWM controllers like the SG3524, UC1843 etc as shown
in the scematics below:
http://www.electronicsdesign.dk/tmp/HighSideBuck.pdf
I haven't build it yet, but do any of you have experiences with this?
Ofcourse I need to make a seperate plane connected to the SW (switch)
node below the entire PWM controller circuit to combat leakage
currents by the parasitic capacitances/dV/dt.
Anything more to look out for?
Thanks
Klaus
.
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