Diodes D3 and D4 on the LMG5200 EVM

Ariel Pickholz26

Intellectual 1295 points

Other Parts Discussed in Thread: LMG5200

Hi ,

What is the exact purpose of D3 and D4 on the EVM of te LMG5200 ?

(the diodes that bypasses the R14 and R2 in the RC filter circuits of the PWM logic driver)

Thank you ,

Arik.P.

TI sales

over 10 years ago

0 Eric Faraci over 10 years ago

TI__Expert 8210 points

D3 and D4 are part of the dead time generating circuitry. They work with R14 and C22 for the top and R2 and C35 for the bottom FET to delay just the turn on time, generating a dead time that will prevent a shoot through condition.

0 Ariel Pickholz26 over 10 years ago in reply to Eric Faraci

TI__Intellectual 1295 points

Hi Eric ,

Thanks.

Somehow I didn't notice that these are inverters so the logic is opposite - actually a high on their input shuts down the FETs faster using these diodes.

Thanks ,

Arik.P.

Power management

Power management forum

Diodes D3 and D4 on the LMG5200 EVM