No signal comming from tps28226

Alejandro Pereira

Other Parts Discussed in Thread: CSD19501KCS, TPS28226, TPS28225

Hi!
I have the circuit of the image mounted on PCB, there are no problems with the devices or continuity, and i already changed the tps28226, but there are no response from the driver. I'm using a 0.22 uF X7R 16 V capacitor, and csd19501kcs mosfets. The enable signal is 5 V constant, and the pwm signal is generated from a fpga.

What am i doing wrong?

over 9 years ago

Koteshwar Rao over 9 years ago

TI__Guru 55815 points

Hi Alejandro,

I am moving your post to the right Forum to get you the right answer.

Regards,
Koteshwar Rao

Ritesh Oza over 9 years ago in reply to Koteshwar Rao

TI__Intellectual 1880 points

Hi Alejandro,
Let me take a look into this.
Regards,
Ritesh

Ulrich Goerke over 9 years ago

TI__Mastermind 40520 points

Hello Alejandro,

Your schematic diagram shows a TPS28225 controller in the simulation circuit, which has a UVLO turn-on threshold at 3.5V (typ), but your text says you use a TPS28226 in the real circuit on the board. The VDD turn-on threshold of the TPS28226 is 6.35V (typ), so I suspect that your real circuit simply is not reaching the start-up threshold with a 5-V source. If you can increase your VDD source, without damaging any other circuits that may be attached to it, that should get it to operate.

Regards,
Ulrich

Alejandro Pereira over 9 years ago in reply to Ulrich Goerke

Prodigy 110 points

God, thanks!
I'll to try that solution, i hope it works.

Power management

Power management forum

No signal comming from tps28226