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TPS65100: power consumption

Part Number: TPS65100

Hello all,

my customer is usung our TPS65100 in a 7" display application. The display works up to 85°C. at the ambient temperature of 23°C our
chip reaches 50°C. So our chip is a head source direct under the display.

My customer has several questions:

1. See we a posssibilty the lower the power losses in our chip?

2. Can the customer uses our chip up to 80°C ambient?

3. Did we have a chip which works up to 105°C?

4. Did we have an alternative part who fulfil the requirements from my customer?

I add the schematics the data sheet from the display and a temperature view. E1 is our chip.

Best regards

Egon

  • Hi Egon,

    I have notified our expert regarding this topic. Please expect a response by 10/19/18.

    Thanks,
    Aaron
  • Hello Egon,
    Switching frequency and RDSon of the switching FETs is not changeable so power loss inside the chip can not be changed much. We could change external conditions to reduce power losses inside the chip such as using a slightly higher Vin (DVDD) or slightly lower VDDA boost output supply if it is possible in the application because power dissipation will higher when conversion ration (Vout/Vin) is higher.
    Regarding whether chip can be used up to 80C ambient. The answer is yes it can be used up to 85C ambient as the datasheet says but the ultimate specification is the junction temperature at the die and the specification for that is 125C. Junction temperature will depend on how much power is dissipated in the chip, how good/bad heat dissipation mechanisms are on the PCB and system enclosure etc.
    There is an automotive grade version of this device (TPS65100-Q1) which has the ambient temperature specification of of 125C. So you can consider using that device as well.
    Kind Regards,
    Liaqat