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TPS54060 - Configuring EVM for 39 V output, temperature compensation

Other Parts Discussed in Thread: TPS54060, TPS54060EVM-457


Two questions around the TPS54060:

1. To get a 39 V output from the TPS54060EVM-457, are there any other changes that need to be made besides the resistor divider R6/R7 (as shown in datasheet snippet below) and higher voltage rated caps at C5 and C6?

EDIT: Using WEBENCH, the values for L1 and R3 changed along with R6/R7, so I will find components that match the WEBENCH-recommended values and EVM footprints. Please advise if any other changes should be made to get 39 V output from the EVM.

2. In general when designing the circuit around the TPS54060, are there any suggestions you can provide for temperature compensation / trying to keep the output regulation < 1.25% at higher temperatures?

The datasheet spec for voltage reference tolerance across operating junction temperature (-40 to +150C) is +/- 16 mV (2%). At 25C, it is +/- 8 mV (1%). Can it be compensated to be 1.25% at least for 70C?

I read some notes in the datasheet about choosing appropriate dielectrics for the capacitors to minimize the variation there, but any other tips would be much appreciated.



  • Answers:

    1 - The WEBENCH-produced design for 39 V out is a good starting point to determine what components need to  be changed on the EVM. It's also a good idea to double check the compensation network with PSPICE.

    2 - VREF is a trimmed parameter, and the tolerance is internal-based, so it can't be compensated for short of a temperature compensated active feedback circuit. However, looking at characterization data at 85 C, 1% to 1.25% can generally be expected at 70 C.