problem with TPS28225 in synchronous boost DC/DC converter

Lionel Seguier

Other Parts Discussed in Thread: TPS28225

Hello,

I have built a DC/DC synchronous boost converter, to do this i use two mosfet and to control this one, I use a TPS28225 driver.

But the system don't work, the low side mosfet switch well but the high side don't work, we haven't signal on UGATE port.
I don't understand the problem, if you have a solution for me i will be happy.

thank you in advance

over 11 years ago

0 Avi Chami1 over 11 years ago

Mastermind 7395 points

I think that both Q3 and D7 are inverted. Look carefully at the circuit application on the datasheet, one-phase POL regulator.

0 Lionel Seguier over 11 years ago in reply to Avi Chami1

Prodigy 30 points

I don't understand what do you mean ?

This is a syncronous boost topology and I use a mosfet transistor N channel thus I think the power components are in a good place.

I have replace the mosfet by a diode and mosfet to improve the efficiency.

0 aurelien.ah14 over 10 years ago in reply to Lionel Seguier

Prodigy 10 points

Hello, I have exactly the same problem and my scheme is more simple!!!

So if you had resolved your problem, let me know.

Thank.

0 Lionel Seguier over 9 years ago in reply to aurelien.ah14

Prodigy 30 points

hello,

i have always the same problem. I abandoned this device.

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problem with TPS28225 in synchronous boost DC/DC converter