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Original question:

SN6507: High temperature rise in transformer at light loads

SN6507: High Temp. rise with nominal load

Umang Butani
Prodigy 160 points
Part Number: SN6507

Tool/software:

Hello, 

We have developed in Isolated power supply sch using SN6507. 

During testing, we found IC and TXR temperature are increasing 50+ Degree. 

Below is snapshot of  SCH, output of this power schematics will drive four UCC21530B driver.

Kindly provide your suggestion on how to mitigate high temp rise in circuit. 

Best Regards,

Umang

  • 0
    TI__Genius 10300 points

    Hi Umang,

    Is this temperature rise happen with output load of 500mA? 

    Are the resistors R317, 318 connected? If connected can you remove the same and test it once.

    Can you please monitor the input current and share.  

    Thanks. 

  • 0 in reply to Shinu.V.Mathew
    Prodigy 160 points

    Hello Shinu, 

    Is this temperature rise happen with output load of 500mA? 

    - Yes, Load current is ~300mA

    Are the resistors R317, 318 connected? If connected can you remove the same and test it once.

    -Its not connected, (DNP suffix parts are not connected)

    Can you please monitor the input current and share.  

    -Its directly supply through switcher rated output of 12V 3.5A (Complete system require 2A at full load)

    - As Its directly connected to +12V polygone its difficult to measure input current, though I will try and let you know.  

    Best Regards,

    Umang