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TPS92612: Product suggestion

Hideki Hayashi1
Expert 8740 points
Part Number: TPS92612
Other Parts Discussed in Thread: TPS92620-Q1, TPS92621-Q1, TPS92621Q1EVM

Hi team,

I am looking for below device.

VIN is 24V PWM voltage (400Hz, or 1kHz), customer is considering a constant-current output (PWM drive) with an output of 250mA or 350mA. 

Such as TPS92612 LED Driver, which inputs PWM signals separately from the power supply, Is there any IC that allows PWM dimming by varying the input voltage itself?

Regards,

Hayashi

  • 0
    TI__Genius 10320 points

    Hi Hayahsi,

    • Could you share more details about this application, such as output voltage, and operating temperature...
    • Do you need the diagnostic function, if this function is required, for the output current of 250mA, I'd like to recommend the TPS92621-Q1; for the output current of 350mA, I'd like to recommend the TPS92620-Q1.
    • What do you mean "PWM dimming by varying the input voltage"? I think it is similar to SUPPLY dimming from your description. This device can support SUPPLY dimming - PWM signals via SUPPLY pin.

    BR,

    Hailee.

  • 0 in reply to Hailee Xu
    TI__Expert 8740 points

    Hi Hailee,

    Hailee Xu said:
    What do you mean "PWM dimming by varying the input voltage"? I think it is similar to SUPPLY dimming from your description. This device can support SUPPLY dimming - PWM signals via SUPPLY pin.

    Yes, it is correct.

    I will check other questions. Regarding device selection the lower current should be 150mA not 250mA. Is TPS92620/1 still recommended? Customer needs small size solution.

    Customer think C(supply) on the input will limit switching frequency. How much frequency is the lowest? Is it able to support 400Hz?

    Regards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Genius 10320 points

    Hi Hayashi,

    • Yes, For the lower current, the customer could still consider TPS92621/0-Q1. The TPS92621-Q1 can support the output current up to 300mA. The TPS92620 can parallel output channels and support the output current up to 500mA.
    • Yes, the Csupply would limit the switching frequency, the customer can change Csupply accordingly. In addition, I will test the TPS92621Q1EVM board with 400Hz of supply dimming and will get back to you later.

                Please refer to the 7.3.6 Supply Control of TPS92621-Q1 Single-Channel, Automotive, High Side LED Driver with Thermal Sharing datasheet.

    BR,

    Hailee.

  • 0 in reply to Hailee Xu
    TI__Expert 8740 points

    Hi Hailee,

    Do you have a target to finish 400Hz of supply dimming? It can be explained theoritically.

    REgards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Genius 10320 points

    Hi Hayashi,

    Yes, the device can support 400Hz of SUPPLY dimming. Please see the test waveform, it is based on the TPS92620EVM board. it is similar to the TPS92621-Q1.

    You can also test our EVM board, it is easy to use.

    BR,

    Hailee.