LM5050-1 OFF pin function

Tsfania Tsalisher

Prodigy 170 points

Other Parts Discussed in Thread: LM5050-1

The OFF pin in H or L does not influence the output.

what may be the reason?

i use 2 lm5050-1 to select the hight voltag source between 2. 21 volt and 28 volt. it work fine.

but the OFF function does not work

can some one help?

over 13 years ago

0 Donald Jones over 13 years ago

TI__Mastermind 22610 points

LM5050-x OFF pin disables the internal reverse comparator and the active gate drive circuitry, and connects the GATE pin to the IN pin so that the MOSFET Vgs is 0.0V and the MOSFET is OFF.

HOWEVER ... the MOSFET has an internal body diode that will conduct if : 'Vin - Vout > 0.6V'. In this case the MOSFET body diode becomes an inefficient OR-ing diode. See your MOSFET spec-sheet for a characteristic curve for 'Vsd, Body Diode Forward Voltage', or similar.

0 Ronald Crews over 13 years ago in reply to Donald Jones

TI__Intellectual 940 points

Test - Please ignore.

Ron Crews

Power management

Power management forum

LM5050-1 OFF pin function