LM25085 still seems like a good way to go at those current levels to avoid compensation trouble. However as you are changing VOUT very infrequently, it should be possible to go with PWM converters, e.g., LM2678 or TPS5450. Both of them have internal compensation…
The TPS5450 and TPS54332 probably only have theta JA based on teh EVM board. I can request thermal data from our packaging group. It may take a couple weeks to ge the data.
You could consider the TPS5440 (or TPS5450-Q1, which is automotive catalog part). Input voltage 36V, output current 5A (6A peak).
http://www.ti.com/product/tps5450
http://www.ti.com/product/tps5450-q1
after changing C128 to 0.01uF, there is still 1.5V input voltage.
I have used the same circuit for TPS5450 successfully with different Mosfet setting since TPS5450 generate higher current than TPS5420.
Maybe the problem is from P Mosfet.
Do you…
What is the difference between PWM controller and TPS5450, which says the amount of output current? So TPS5450 is not a PWM controller? If so, what genre of power regulator is it?
David:
It appears the TPS54240 is newer swift IC. The question on whether to use the TPS5450 ro TPS54240/260 for -17V should sent to the SWIFT group.
I appears the TPS54240 is rated to 2.5A and the TPS5450 is rated to 5Amps .
The other factors…
Other Parts Discussed in Thread: TPS5450 In my application, the input voltage is 24V.
Please recommend me a step-down DC/DC converter with 15V output and 2AM continuous output current.
Do you think TPS5450 can realize my requirements?
Thanks…
