TPS61240: Output Current under short condition

Hisao Uchikoshi

Genius 14180 points

Part Number: TPS61240
Other Parts Discussed in Thread: TPS62141

Hi Experts,

We are doing an output short test. When shorted voltage output to GND, the output current continues to flow about 80mA.

VIN : 3.3V

VOUT : 5V

Is this a expected behavior?

Regards,

Uchikoshi

over 4 years ago

0 Zack Liu over 4 years ago

TI__Mastermind 34201 points

Hi Uchikoshi,

May I know how customer implement the output short test and how do they measure the output current 80mA?

0 Hisao Uchikoshi over 4 years ago in reply to Zack Liu

TI__Genius 14180 points

Hi Zack,

We shorted it shown in yellow and measured output current at the point of circle in red .

Does this answer to your question?

Regards,

Uchikoshi

0 Zack Liu over 4 years ago in reply to Hisao Uchikoshi

TI__Mastermind 34201 points

Hi Uchikoshi-san,

Just want to confirm it with you are talking about the boost converter TPS61240, not the TPS62141.

TPS61240 input voltage range is 2.3V to 5.5V, cannot handle 24V Vin.

0 Hisao Uchikoshi over 4 years ago in reply to Zack Liu

TI__Genius 14180 points

Hi Zack,

I am so sorry. Yes, I am talking about TPS61240. Input voltage is 3.3V. Sorry for confusing you.

Regards,

Uchikoshi

0 Zack Liu over 4 years ago in reply to Hisao Uchikoshi

TI__Mastermind 34201 points

Hi Uchikoshi-san,

That's normal behavior. During short circuit condition, the device is still switching, delivering current to output.

0 Hisao Uchikoshi over 4 years ago in reply to Zack Liu

TI__Genius 14180 points

Hi Zack,

Thank you for your answer.

Is there any specification on the datasheet?

Regards,

Uchikoshi

0 Zack Liu over 4 years ago in reply to Hisao Uchikoshi

TI__Mastermind 34201 points

Hi Uchikoshi,

Sorry. What you found under TPS61240 short circuit condition is the expected behavior.

Under short circuit condition, the device stops switching and consumes around 90mA current from input.

When Vout=0V, the device is in startup precharge phase, the current limit is related to the output voltage level, it is 90mA typical at Vout=0V condition.

0 Hisao Uchikoshi over 4 years ago in reply to Zack Liu

TI__Genius 14180 points

Hi Zack,

Thank you for your reply.

May I consider that below is incorrect?

Since I am almost new to power device, I want to confirm.

Regards,

Hisao Uchikoshi

0 Zack Liu over 4 years ago in reply to Hisao Uchikoshi

TI__Mastermind 34201 points

Hi Uchikoshi,

Yes. During short circuit condition, the device is not switching.

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TPS61240: Output Current under short condition