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TPS92613-Q1: Using TPS92613-Q1 for driving resistive load

Rahul Wagh
Prodigy 85 points

Part Number: TPS92613-Q1
Other Parts Discussed in Thread: LM3405, TPS92200, LM3405A

Hi,

I am planning to use TPS92613-Q1 to drive a resistive load which takes 0.55A@5V.

My input voltage is from 5V adapter.

The main reason for slecting the driver is, i want to control the resitive load current using PWM pin to cotrol the heating of the resistor.

Do you see any issue with this approach.

Looking forward to your guidance.

Regards,

Rahul

 

  • 0
    Prodigy 85 points

    One more query why the typical application use diode at the input of supply.

    As i do not need reverse polarity protection, and i may not need that? 

  • 0 in reply to Rahul Wagh
    TI__Intellectual 1630 points

    Hello Rahul,

    What is your PWM frequency? What is the minimum duty cycle? Do you have linearity requirements? What is the input voltage range? 

    This is a high current for a heating element. Would a switching device work for the application? These devices have a higher efficiency than our linear devices.

    This might be able to provide a constant current to a resistive load. You will need to understand how the resistance changes as the load to ensure that the device will be able to maintain the required dropout voltage from IN to OUT.

    If your current is 0.55A, the required dropout could be as high as 2V. This means that the output voltage would need to be less than 3 volts to ensure proper operation. In addition, the power dissipation of the device would be 1.1W and this would result in a junction to ambient temperature increase of 30C.

    The diode is for reverse polarity protection.

    Kind regards,

    Nicholas Alexander

  • 0 in reply to Nicholas Alexander
    Prodigy 85 points

    Hi Nicholas,

    Thank you for your reply.

    I expect the PWM frequency around. No specific requirement for linearity. Input Voltage range is 5V-15V.

    Because of wider input range and to keep the resistive load value fixed I have also decided to go with the switching device.

    And I need smaller size Switching device and found LM3405 would be good choice for the application.

    Your thought on this will help me on this.

    Thanks,

    Rahul

  • 0 in reply to Rahul Wagh
    TI__Intellectual 1630 points

    Hello Rahul,

    The LM3405 looks like a better option for this application. Other options could be the TPS92200 or the LM3405A. I am not the expert on these devices so I'll link you to the expert of these devices.

    Kind regards,
    Nicholas Alexander

  • 0 in reply to Nicholas Alexander
    TI__Mastermind 35055 points

    Hi, Bella

    Could you pls help to support this case?

  • 0 in reply to Rahul Wagh
    TI__Mastermind 29266 points

    Hi Rahul

    For the Vin 5-15V, 0.55A@5V application, TPS92200 is recommended. It's synchronous buck LED driver with PWM dimming. 

    Can you please share what's you end equipment? And what's the expected PWM frequency? Is the resistive load a fixed R or is there a I-V curve?

    Thanks and best regards.

  • 0 in reply to Gui He
    Prodigy 85 points

    Hi Gui,

    Thanks for your suggestion.

    I was looking for high side LED driver as the other end of the resistive load is connected to ground terminal.

    The load is pure resistor for heating purpose.

    Thanks,

    Rahul

  • 0 in reply to Rahul Wagh
    TI__Mastermind 35055 points

    Hi, Rahul

    Our expert will reply you late.

  • 0 in reply to Rahul Wagh
    TI__Mastermind 29266 points

    Hi Rahul

    Thank you. TPS92200 is recommended for your application. When Vin=5V, the buck converter will operate under max duty and Vout will be close to 5V.

    Best regards.