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LM3414 surface temperature

Jay Kim
Intellectual 475 points
Other Parts Discussed in Thread: LM3414HV

Hello,

We use LM3414HV on our dimmer board for 50W LED light.

Input voltage to dimmer board is 52V.

When 100% dimming, surface temperature of LM3414HV goes around 89°C.

Is this normal? And if not, any way to reduce temperature?

 

  • 0
    TI__Intellectual 1825 points

    Hi,

    Can you tell me more about the type of dimming you are doing for your design?  Are you using PWM dimming or Analog dimming for your design?

    Best Regards,
    Jonathan Arzadon
    Applications Engineer
    WEBENCH® Design Center
    Texas Instruments

  • 0 in reply to Jonathan Arzadon
    Intellectual 475 points
    Hello,

    Using PWM dimming with 3.2kHz and LM3414HV 's switching frequency is 500kHz.

    We had done some corrections to our hardware and now at 100% dimming, temperature is 53°C.

    Changing switching frequency affects surface temperature?
    (If I Change LM3414HV 's switching frequency as 300kHz or so, surface temperature will go lower?)

    Thanks in advance,
    Jay
  • 0 in reply to Jay Kim
    TI__Intellectual 1825 points
    Hi Jay,

    Yes, changing the switching frequency will affect the IC temperature.

    Higher switching frequencies create higher temperatures because the internal FET is turning on and off much faster, which means the FET is dissipating more power and generating more heat.

    Lower frequencies mean the internal FET would be switching on and off much slower, and so the IC temperature would not be as high.


    Regards,
    Jonathan Arzadon
    Applications Engineer
    WEBENCH® Design Center
    Texas Instruments