TPS40090-Q1: 100→56V，800W circuit

Gary Gaooo

Intellectual 775 points

Part Number: TPS40090-Q1
Other Parts Discussed in Thread: TPS40090

design a circuit that 100V to 56V，about 800W；

the circuit of TPS40090 is same as the EVM

the following is the Architecture at a later level

but i only get 3V of the output voltage，why？

over 6 years ago

0 Qian Chen over 6 years ago

TI__Mastermind 24075 points

Hi Gary,

Can you provide full schematic in pdf file?

Thanks

Qian

0 Gary Gaooo over 6 years ago in reply to Qian Chen

Intellectual 775 points

TPS40090.pdf

Hi Qian

FYI

0 Qian Chen over 6 years ago in reply to Gary Gaooo

TI__Mastermind 24075 points

Hi Gary,

Which current sensing method is used in the circuit?

In full schematic, the low side FET current is sensed. TPS40090 is a peak current mode controller. It needs high-side FET current information to generate PWM. The circuit will not work with low side FET current sensing.

In your previous picture, the DCR circuit is used to sense inductor current, but the DCR ciruit is not correct.

Also, the inductor value may too small for this high Vin and high Vout applicaiton. What's the load current?

Thanks
Qian

0 Qian Chen over 6 years ago in reply to Qian Chen

TI__Mastermind 24075 points

HI Gary,

We don't hear from you for one week. Not sure if the issue is solved or not.
Please let us know if you need further support.

Thanks
Qian

Power management

Power management forum

TPS40090-Q1: 100→56V，800W circuit