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1200 VDC / 24 VDC ICs, buck+half bridge

Toni
Prodigy 90 points

Dears,

are there any ICs to support a cascaded buck + half bridge topology for following ratings:
Vin = 1200 VDC
Vout = 24 VDC
P = 150 W
buck switched at about 25 kHz.

Any suggestions for a different topology for the given ratings? High efficiency is desired.

Many thanks!

  • 0
    TI__Expert 7395 points
    Toni,
    Have you looked at a 2-switch flyback toplology? That might be the upper end of its power optimized range but it could be a good fit. It will also depend greatly on whether the input voltage varies. Is it regulated at 1200v or is there some min Vin and Max Vin? What's the application here?
  • 0 in reply to John Stevens
    Prodigy 90 points

    Hi John,

    Thanks for the tip, I have not been looking into the 2 switch flyback topology.

    The application is an industrial AC drives, 400-690 VAC, 1kW - 1MW. For a 690V application the smps is supplied with 850-1200 VDC. However, the smps should remain operational with the supply going down to aprox. 200 VDC (performance does not matter in this region).

    A single switch flyback topology works well, but the efficiency and the cost are becoming a burden for the low cost products. An alternative, custom made, solution with a buck+half bridge topology increases the efficiency and reduces the total cost significantly. The drawback is a totally discrete circuit. An integrated circuit would make it much more attractive.