Charge Pumping and High-side Switching

Discussion in 'General Electronics Chat' started by redlerm, Apr 19, 2009.

  1. redlerm

    Thread Starter New Member

    Apr 15, 2009
    2
    0
    Hi everyone,

    I'm working on a charge-pump, inductorless DC/DC step-down converter (500+ to 24vdc). Ideally, I'd like a FET controller which works like a half bridge, but can perform high-side switching from both outputs. Since I can't find that flavor of bridge (I'm not sure you would even call that a bridge), I was thinking of cascading a single channel, (high-side) driver (IR2127) to the low-side output of a half-bridge driver (IR21844).

    I could simply use two shingle channel drivers, but want to avoid cross conduction during input transitions. The IR21844 has a nice "dead time" feature which I really like and would allow switching to occure with no overlap.

    Does anyone have any experience with such a setup?

    Thanks in advance.

    Mike
     
  2. redlerm

    Thread Starter New Member

    Apr 15, 2009
    2
    0
    I think I answered my own question. Fairchild makes a dual, high-side FET driver, FAN7385.

    Moving on...

    Mike
     
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