Full Bridge SMPS, 125kHz, with High side bootstrap drive

Status
Not open for further replies.

cupoftea

Advanced Member level 6
Joined
Jun 13, 2021
Messages
3,059
Helped
62
Reputation
124
Reaction score
139
Trophy points
63
Activity points
15,963
Hi,
Would you say the LTC4440 would be OK to use with a 125khz LTC3723-1 based full bridge for hi side bootstrap drive?
Spec is 300w, 10-36vin, 32vout. 125khz.

Its odd that the LTC3723-1 datasheet only lists pushpulls in the examples pages....after all pushpull is a lousy topology that lumps you with twice vin on the primary fets, and a relatively higher leakage inductance induced overvoltage ring than full bridge.......so, in LTC3723-1 datasheet, why no full bridge's shown with their LLTC4440 driver?

LTC4440

LTC3723-1
 

Attachments

  • 300W fullBridge _SplitSec _230116.jpg
    151.9 KB · Views: 134
  • fullBridge300w_SS_FASTRUN_LTC4440.zip
    3.2 KB · Views: 128
Last edited:

LTC3723 datsheet states "Supports Push-Pull, Full-Bridge, Half-Bridge, and Forward Topologies"
If you have doubts about bootstrap driver suitability, it shouldn't be specfic to LTC3723.
 
Status
Not open for further replies.
Cookies are required to use this site. You must accept them to continue using the site. Learn more…