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TL494: PWM pulse issue to drive the buck converter for current limiting application in Telecom BMS

Yugal kishor
Prodigy 10 points
Part Number: TL494

Hello Team,

We are getting issue in PWM pulses generated by TL494 IC for DC-DC Buck converter employed as current limiting circuit for Telecom BMS used in 48V battery pack. The scope image is attached for reference, here RED circled portion indicate the PWM pulse issue. The obtained PWM have multiple on-off period during each cycle. The optocoupler EL357 is employed between TL494 and differential amplifier (TLV2379IDR).  Kindly suggest the suitable changes to get correct PWM pulses. 

  • 0
    TI__Guru 58765 points

    Hi,

    I cannot access the google drive. Please upload your files into this below:

    https://tidrive.ext.ti.com/u/q_9utJ7_bq-5_26m/7ac61010-951c-413d-8126-3d4719db0626

    If you cannot open this above, please provide your email to hong_huang@ti.com, I will send you login access code.

    Please also upload your schematics - I need this to review and make suggestions.

  • 0 in reply to Hong Huang
    TI__Guru 58765 points

    Hi,

    I did not receive your additional feedback. I assume the issue is no longer existing. I will close this thread. If need further support, please re-open this thread or create a new one.