TPS61230EVM-089: TPS61230EVM don't work with 5 ohms load (1A load current)

Guruprasad Solapurkar

Part Number: TPS61230EVM-089

TPS61230EVM is not working with 5 ohms load (1A load current). The input voltage is varied from 3.6V to 4.5V. For all range output is not stable. Waveform is attached

The kit works fine with 12 ohm load (0.4A) current. I have not checked intermediate load values.

over 6 years ago

0 Zack Liu over 6 years ago

TI__Mastermind 34231 points

Hi Guruprasad,

What does the channel 2 mean? Vout?

When 5ohom load is loaded, what's the output voltage value? Have you checked the input voltage with DMM or scope?

0 Guruprasad Solapurkar over 6 years ago in reply to Zack Liu

Prodigy 240 points

Yes channel 2 is Vout.

I have checked input voltage with multimeter.

0 Zack Liu over 6 years ago in reply to Guruprasad Solapurkar

TI__Mastermind 34231 points

Hi Guruprasad,

Have you changed anything on EVM?

Please probe SW, Vin, Vout at the same time. Also take a look at FB pin waveform.

0 Zack Liu over 6 years ago in reply to Zack Liu

TI__Mastermind 34231 points

Hi Guruprasad,

Any new feedback?

0 Guruprasad Solapurkar over 6 years ago in reply to Zack Liu

Prodigy 240 points

Hello,

The issue is solved. This was due to input cable drop. Earlier we measured input voltage on power supply input with multicenter. However at high load voltage at Eval board input was less than 3.3V, so EN pin of kit getting low voltage.

Power management

Power management forum

TPS61230EVM-089: TPS61230EVM don't work with 5 ohms load (1A load current)