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Original question:

Usage of TPS61169

TPS61169: Can I consider it as a current source?

Howard Zou
Genius 12365 points
Part Number: TPS61169

For this device, I can set the output current, and then it will work as a constant current source, right?

Then the output voltage is determined by the LED.

With the same current set, the output voltage may vary if the LED varies, right?

And how do I know what's the maximum number of series/parallel LED can I drive with this part?

  • 0
    TI__Mastermind 22745 points
    Hi Howard,
    Your understand is right. The total LEDs that you can drive was determined by : minimum input voltage, switching MOSFET current limit, forward voltage of LED and maximum output current. So this really depend on your detail application. You can calculate the parameters ferreter to section 9 in TPS61169 datasheet. Thanks.
    Sean
  • 0 in reply to Sean Zhou
    TI__Genius 12365 points
    Sean,
    so if the customer buy an LED string, the string will have parameters like how many current it needs, and how many voltage it needs, right?
    As long as it's within 38V, 1.2A, they can use this device, right?
  • 0 in reply to Howard Zou
    TI__Mastermind 22745 points
    Hi Howard,
    No, you need to know the minimum input voltage, the 1.2A is the internal current limit ,not the maximum output current. If you can provide the minimum input voltage, maximum output current, then you can know the maximum output voltage and maximum LEDs. You can give me some parameters, I can give you a example.
    Sean
  • 0 in reply to Howard Zou
    TI__Mastermind 22745 points
    I'll close this thread due to inactivity and if you have more questions please reply to it directly and it will open again. Please help to click "Resolve" if the problem is solved.