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TPS92410: Without TPS92411

Part Number: TPS92410
Other Parts Discussed in Thread: TPS92411

Hi,

Can TPS92410 operate without the TPS92411?

I allow not to control current value of each LEDs.

Best Regards,

Kuramochi

  • Hello,

    It will work without the TPS92411. From rectified AC the power factor will be poor, it can work from DC well. It depends on what you are planning to do with it.

    I do not understand: "I allow not to control current value of each LEDs"

    Best Regards,
  • Irwin-san,

    Thank you for your advice.

    I may not understand the behavior of the TPS92411 correctly.

    >From rectified AC the power factor will be poor, it can work from DC well.
    Does it mean that it can work well as PFC if TPS92410 and TPS92411 is used together?

    I have assumed that the TPS92411 works to control current for each LEDs.


    Best Regards,
    Kuramochi

  • Hello Kuramochi,

    TPS92410 is a current regulator set up for PFC and line regulation. Similar to a PFC IC but for linear current regulation. It does not require the TPS92411 switches.

    TPS92411 is a 'smart' switch. It either allows current to flow to LED sections or bypass the LEDs. This allows a current regulator (such as the TPS92410) to continue to regulate current when the input voltage is less then the overall stack voltage. If three are used it can be set up binary with, as an example, an 80V, 40V and 20V section. This means when the input voltage is above 80V+40V+20V all TPS92411s will be open. If the input voltage is lower the correct switches will be closed an open. For example, if the input voltage is at 70V the 80V TPS92411 will bypass the LEDS and the 40V and 20V will allow the current to flow to the LEDS, 40V + 20V = 60V. This leaves 10V across the MOSFET linear current regulator, 70V - 40V - 20V = 10V.

    The TPS92410 and TPS92411 do not need each other for operation, they just work better together. One regulates the LED current, the other determines which LED sections should get current and which should be bypassed. This is explained in the datasheet and reference designs.

    If just the TPS92410 is used it will regulate current in the LED (say the LED stack voltage is 120V). Once the input voltage drops below 120V the TPS92410 cannot provide current to the LEDs because the input voltage is lower than the LED stack voltage.

    Best Regards,