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LM5060: controlling EN with a switch

GARETH OU
Mastermind 8835 points
Part Number: LM5060

Hi 

I have questions to ask

When 

When EN PIN high has output voltage,
Then the output power of EN PIN low is turned off, and there is no output when EN PIN is high.

Is this caused by latched?

The left picture is normal opening, the right picture is EN ON→OFF→ON
CH1 P12V_SB
CH2 EN

  • 0
    TI__Guru* 95911 points

    Hi Gareth,

    LM5060 latches OFF for a fault condition and remain off until either the EN, UVLO or VIN (POR) input is toggled low and then high. But here, EN is controlled purposefully and is not related to Latch function of the device.

    Can you share details of the load type and value. 

    Can you include load current and input voltage in the above test waveform. Also, did the device resumed operation if you do a VIN (POR) ?

    Best Regards, Rakesh

  • 0 in reply to Rakesh
    Mastermind 8835 points

    Hi Rakesh

    Thank you very much for your reply

    waveform test condition VIN =12V VOUT = P12V_SB, no load

    Does VIN (POR) mean vin restart?

    Could you help check the LM5060 schematic as below and any need to adjust?

    embc-2000_0b_0705 (003).pdf

  • 0 in reply to GARETH OU
    TI__Guru* 95911 points

    Hi Gareth,

    Schematic looks fine.

    Does VIN (POR) mean vin restart?  yes

    Is the device able to powerup with out 560uF at the output ?

    Best Regards, Rakesh