LM5050-1: LM5050-1 application question

Sulyn ZHANG

Part Number: LM5050-1

Hi Team,

My customer is asking if they can use our LM5050-1 to driver the two back-to-back MOSFET like below? Because customer is planning to use it or not, so Can you help check, thanks a lot.

Best regards,

Sulyn Zhang

over 7 years ago

0 Sulyn ZHANG over 7 years ago

TI__Expert 8700 points

Hi Team,

Any one can help check this asap, thanks a lot!

Best regards,

Sulyn Zhang

0 Aramis P. Alvarez over 7 years ago in reply to Sulyn ZHANG

TI__Genius 10370 points

Hi Sulyn,

The LM5050 unfortunately, cannot be used with back-back FETs. The reason is because:

1. There is an internal zener diode clamp from IN to GATE. So charge will make its way to the GATE and keep the MOSFETs on.

2. The LM5050 pulls GATE to IN rather than to ground.

If you need back-back FETs and some of these features, perhaps this two-chip solution, tested TI Design would be of interest: http://www.ti.com/tool/TIDA-00233

Best Regards,

Aramis P. Alvarez

0 Sulyn ZHANG over 7 years ago in reply to Aramis P. Alvarez

TI__Expert 8700 points

Hi Alvarez,
Thanks a lot for your support!

Best regards,
Sulyn Zhang

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LM5050-1: LM5050-1 application question