TPS61089: How to improve the performance of load transient

Troyson Li

Part Number: TPS61089

Hi TI team ,

My customer used TPS61089 which comp circuit is the same as Typical Application in specfication. But they found the load transmit are not both quickly and good(Test conditons:0A@ 0.5ms ->2A @ 0.5ms)

And there is a huge voltage-drop like the following picture. we will appreciate if TI can give some advice to improve performance of load transient.Thank you!

over 5 years ago

0 Helen chen over 5 years ago

TI__Mastermind 40080 points

Dear Sir,

We need to know Vin, Vo and your current schematic.

0 Troyson Li over 5 years ago in reply to Helen chen

Expert 2505 points

Hi Helen ,

The VIn is 7.2V and the OUT is 12V/3A. The attachment is their sch. Thank you!

0 Helen chen over 5 years ago in reply to Troyson Li

TI__Mastermind 40080 points

I found you use a 0.1uF VCC cap, please change it to 2.2uF/16V rating cap. 0.1uF is really too small. But this may not the root cause of the output voltage drop.

You can increase the Rcomp=30k, ccomp=2.2nF for a double check, by the way, what is the output cap effective capacitance under 12VDC bias?

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TPS61089: How to improve the performance of load transient