TPS562201: TPS562201 ENABLE PIN ISSUE

Anand Sands

Prodigy 60 points

Part Number: TPS562201

Hi Team

Hope all are fine

I m using TPS562201 buck converter for 8.4V to 3.3V conversion .

Load current is 70mA max

I m controlling ENABLE pin via pushbutton ON/OFF controller ic

Now I faced an issue .Two times IC enable pin got damaged .

I have attached schematics .Kindly give me a solution asap.

over 4 years ago

0 Young Zhao over 4 years ago

TI__Genius 9480 points

Hi,

What's your Min and Max voltage for TPS562201 EN pin ? Could you help check the waveform with scope ?

Best Regards,

Young Zhao

0 Edwin Zang over 4 years ago

TI__Expert 6425 points

Hi Sands,

Pushbutton is mechanical switch. it will cause large spike voltage. So i think this spike voltage cause EN pin damage. it's suggested to add a 0.1uF bypass cap from EN pin to GND to filter the spike voltage.

BRs,

Edwin.

0 Anand Sands over 4 years ago in reply to Edwin Zang

Prodigy 60 points

Thanks Edwin

Let me try and convey the result

0 Anand Sands over 4 years ago in reply to Young Zhao

Prodigy 60 points

Hi Young Zhao

My ENA Max voltage is 8V

Min Voltage is 6.5V

My waveform when power ON and OFF are good

But whenever i insert my power supply connector Im getting a spike waveform in ENA pin which is tied to Buck converter .Attached the waveform .As result without pressing switch unit gets ON for some milliseconds and Then OFF

0 Young Zhao over 4 years ago in reply to Anand Sands

TI__Genius 9480 points

Hi ,

It should be the characteristics of the mechanical button .You can try a bypass capacitor to lower the spike affect, suggest to bypass a 1uf cap.

Best Regards,

YOUNG

Power management

Power management forum

TPS562201: TPS562201 ENABLE PIN ISSUE