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TLV11173.3 Heating problem

Shubham Singhal
Prodigy 95 points
Other Parts Discussed in Thread: TLV1117, TL2575-33

We are using LDO TLV11173.3 in our circuit and giving 12 VDC as input. The load current requirement of the circuit is 200 mA and the maximum load current of LDO is 800 mA but it is still heating up. Please suggest the proper solution. Also please find the attachment of circuit we used for LDO.

  • 0
    TI__Guru**** 164796 points

    Shubhan san,

    Power loss becomes heat and it is simply (VIN - VOUT ) * IOUT
    Clearly more power is lost in device than is delivered to the load.
    Most of the power lost in device must travel into the circuit board / heat sink and then be transferred to the ambient air.
    Therefore the heat sink or circuit board thermal performance is critical to keeping the TLV1117-33 cooler.

    A series resistance of 7 ohms could be added to input to share in the power dissipated.
    At 200mA the resistor will absorb 280mW and the TLV1117 will absorb 1460mW
    At 800mA the resistor will absorb 4480mW and the TLV1117 will absorb 2480mW

    Using a switching regulator will save power and reduce device heating by a large margin.
    Try the TL2575-33