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TPS54340B: Running TPS54340 at 2+ mhz

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Replies: 4

Views: 157

Part Number: TPS54340B

Howdy, my last question on this topic was redirected here.  I need help with designing passives (compensation etc) to support a nominal switching frequency on the TPS54340 at 2+mhz, 2.2 mhz would be ideal, for an automotive application.

When I use the "TPS54360-361FAMILY_CALC_TOOL_REVE.xls" the frequency field turns Red, so I'm not sure if that means the value for the cell is "out of bounds" for the calculator.

Thank you so much!

  • Hi Braon,

    What's your input voltage range and output voltage?

    TPS54360 has typical Ton-min time 135ns, it may trig this limitation if the step down ratio is too high at Fsw=2MHz.

  • In reply to Andy Chen:

    Andy, thank you for your kind reply.

    Input voltage nominal 12V, output voltage 3.3, 1Amp design current

  • In reply to Braon Moseley:

    Hi Braon,

    For 12V to 3.3V at Fsw=2.2MHz, estimated Ton time is 143ns which is quite close to Ton-min 135ns.

    You may try LMR14030-Q1 with Ton-min 75ns or LM76003-Q1 with Ton-min 65ns.

    LMR16030 is pin2pin compatible with TPS54360, its Ton-min is 90ns but only available in commercial grade.

  • In reply to Andy Chen:

    Andy, great answer thank you.  The data sheet says max frequency is 2.5mhz, but you're saying I should stay away from that high end on this part?  I do need an automotive part, so I can check out the LM you mentioned.

    I'll also proceed with passives to run at 2.2mhz and see how it goes.

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