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TPS922055: Can TPS922055 drive more than 4A if inductor ripple current is smaller with larger inductance?

Kazuya Nakai59
Guru 21595 points
Part Number: TPS922055

Hello guys,

One of my customers is considering using TPS922055 for their next products as a light source for camera.

They want to drive LED current, 5A as the maximum with 256 steps.
At this moment, they have the following questions.
Could you please give me your reply?

Q1.
Why is the maximum output current of TPS922055 4A?

Q2.
How much the maximum current can TPS922055 drive actually and what is the way?
We know It is difficult to drive LED with 5A but we want to drive the LED with as much current as possible.   

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    TI__Mastermind 23190 points

    Hi Kazuya,

    The maximum current output capability of TPS922055 is limited by two factors:

    1. Heat dissipation. 
    2. Internal current limit (Please refer to Section 7.5 Electrical Characteristics from the datasheet to check the current limit spec)

    If the customer's application can handle the heat dissipation of the IC and they can limit the inductor current ripple (peak-to-peak) to below 0.4A (so that the current goes into the internal FET of the IC will be smaller than 5.2A), then it is possible for TPS922055 to output 5A current.

    Best Regards,

    Steven