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TPS61195: TPS61195 Working issue on 5Volt and LED Blink

Sushant Purav
Prodigy 30 points
Part Number: TPS61195

We are using TPS61195 to Drive the 96 White LED

VIN: 5V

No OF LED: 96

No Of Series String :12

No Of Chanel Use: 8

Dimming Done by: I2C Bus use For Dimming

Inductor Used: 4.7uH

We use Same Schematic as Application drawing for other component

Problem: LED Blink for %Volt input for  any brightness Level.

and even IC also get heat up more

If we use 12V input the device work fine but we need to use on 5V working Voltage.

  • 0
    TI__Expert 4550 points
    HI Sushant,
    If you could measure the inductor current , you will see the max current hits the current limit of the device. I'm afraid the input voltage is too low to driver 96 LEDs with full current.
  • 0 in reply to Caryss Li
    Prodigy 30 points

    thank you for prompt reply

    I dont think the current is more in inductor we use 4.7uH/ ISAT: 2.2Amp.

    Even we are not working LED on Full brightness(Full Power). We use only 50% duty cycle maximum so it should work on 5V supply.

    We select datasheet as per 4.5V minimum voltage for Input supply.

  • 0 in reply to Sushant Purav
    TI__Expert 4550 points
    Hi Sushant,
    Saying current limit, I meant current limit of our device, which is 2.5A min, acctually, the inductor saturation current should be higher than this, otherwise the protection of device cannot prevent inductor going saturation and the current will increase suddenly.
    Although our device could support 4.5V, that is the corner case and depends on output voltage/ current/ inductor. It is a system design, any parameter cannot be treated along.
    I would suggest customer checking inductor current and switching voltage.