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LP8866-Q1: Whether LP8866 can drive light strings with different number of leds

Bruce Yang
Prodigy 120 points
Part Number: LP8866-Q1

Tool/software:

Hello, I need to consult the following questions about LP8866:
1, there are 19 LED, 2 series (10+9), each series needs 500mA current, as shown below the connection mode can work normally? Is there a problem?

2. If it is not possible to connect in this way, can we add a resistor on the string of 9 leds? Is there any suggestion on the resistance value and package required for the resistance in series

  • 0
    TI__Mastermind 19730 points

    HI, Bruce

    Q1: In this way, device will see a high thermal performance due to the high voltage OUT Pin. If one LED vf is higher than 5.4V, it will see the short LED challenge. We suggest to add a diode or resistor to share the thermal from device

    Q2: For diode, it needs to have the similar vf with LED. For resistor, the voltage between the resistor needs to close to Vf. And you can calculate the thermal by I*I*R.