UC3825: UC3825DWTRG4 max voltage rating in each PIN OUT

Red Yen

Expert 4310 points

Part Number: UC3825

Hi Support team

May I have your help to check the ABSOLUTE MAXIMUM voltage RATINGS which was NOT define in D/S

PIN5 RT

PIN6 CT

PIN11 VOUTA

PIN12 PWR_GND

PIN14 VOUTB

PIN16 VREF5.1

thanks a lot

over 3 years ago

0 David Huang33 over 3 years ago

TI__Genius 9140 points

Hi Red:

thanks for your interest on this part.

I have deliver the post to Jaden, he will help on this post.

Wenbin Huang

0 Jaden Ning over 3 years ago in reply to David Huang33

TI__Expert 7080 points

Hi Red,VREF

All of the undefined maximum voltage pins are "internal" pin which are not connected to "external" circuits. such as RT/CT/VREF.

Even for OUTA/OUTB which connected to Mosfet gate pin , It absolutely can support > Mosfet gate pin allowed voltage such as +20V.

and there are schottkey diodes parallel in these pins in datasheet , so don't worry about the negative voltage just follow the reference design.

Hope this can answer your question.

Thanks.

0 Jaden Ning over 3 years ago in reply to Jaden Ning

TI__Expert 7080 points

Hi Red,

Correct my description about OUTA/OUTB in last reply , usually , the driver pin power supply is controller's VDD , So the maximum allowed voltage for this pin is a little higher VDD allowed voltage. you can find in datasheet block diagram , OUTA/B are supplied by VC. Maximum allowed voltage for VC is 30V.

Thanks.

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UC3825: UC3825DWTRG4 max voltage rating in each PIN OUT