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LM5160-Q1: Standby current question

CHO SR
Expert 2915 points
Part Number: LM5160-Q1
Other Parts Discussed in Thread: LM5160

Hi Team,

The customer is using the LM5160-Q1 for the electric compressor inverter.

Even if the secondary circuit enters Sleep mode and does not consume electricity, 20 mA is consumed continuously switching the Transformers in the Fly-buck circuit on the primary side.

The customer wants to enable/disable the LM5160 IC using CAN Transceiver with wake-up function.

Q1: Is there any way to enable/disable LM5160 IC using CAN Transceiver with wake-up function?

Q2. If there is another way to enable/disable LM5160 IC, please recommend it.

Delete schematic

  • +1
    TI__Mastermind 28020 points

    Hello, 

    The LM5160 can be disabled or put into stand-by mode using the EN/UVLO pin. 

    7.3.10 Enable / Undervoltage Lockout (EN/UVLO)

    The LM5160-Q1 contains a dual-level undervoltage lockout (EN/UVLO) circuit. When the EN/UVLO voltage is below 0.35 V, the regulator is in a low-current shutdown mode. When the EN/UVLO voltage is greater than 0.35 V (typical) but less than 1.24 V (typical), the regulator is in standby mode. In standby mode, the VCC bias regulator is active but converter switching remains disabled. When the voltage at the VCC exceeds the VCC rising threshold, VCC(UV) = 3.98 V (typical), and the EN/UVLO voltage is greater than 1.24 V, normal switching operation begins. Use an external resistor voltage divider from VIN to GND to set the minimum operating voltage of the regulator.

    Also, the device can be configured as DCM at light load using the FPWM pin. This will reduce the switching frequency and improve efficiency at light load.

    Regards, Jason