TPS61080: The output -15 ripple is large

user4413695

Part Number: TPS61080

Daer all:

5V input power, output plus or minus 15.The output waveform of -15 was measured by oscilloscope, and the ripple was very large.What's the reason for this?How to solve

over 6 years ago

0 Minqiu Xie over 6 years ago

TI__Mastermind 21565 points

Hi
The waveform is not so clear to judge it caused by circuit design or measurement. Did you use the GND ring during the test? Please see below document：
training.ti.com/measuring-vout-ripple-dcdc-converters
It will be better to support you with proper setup and clear waveforms.

If the problem is still exist, please don't hesitate to contact us.

Best Regards
Minqiu

0 Helen chen over 6 years ago

TI__Mastermind 40080 points

Hi Sir,

What is the output ripple of the +15V output? And what is the load current of the -15V output?

0 user4413695 over 6 years ago in reply to Helen chen

Prodigy 230 points

+15V has a ripple of about 20MV, which is in the acceptable range.Now, without any load, 5V is directly converted to plus or minus 15. Waveform measured by oscilloscope

0 Helen chen over 6 years ago in reply to user4413695

TI__Mastermind 40080 points

Hi Sir,

Please test the -15V ripple directly across the -15V 4.7uF cap. And you may need to add more caps at the -15V load.

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TPS61080: The output -15 ripple is large