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Original question:

LP5560: Standalone LED driver with blinking feature

LP5560: how to enable LP5560 default Blinking

Ben Kuo
Expert 7415 points
Part Number: LP5560

Dear team,

May I double confirm below application can be implemented by LP5560?

- Enable default blinking without MCU control. if yes, how to enable this function?

- We would like to design breathing LED function. Can we implement breathing function by LP5560 timing sequence control?

thanks :)

Regards,

Ben

  • 0
    TI__Expert 7935 points

    Hi Ben,

    For Q1:

    To run the default blinking sequence apply input voltage to VDD pin. Allow the VDD voltage settle before pulling the CTRL pin high. It is not recommended to connect the CTRL and VDD lines together. When CTRL line is pulled high the LP5560 starts to generate the default blinking sequence.Rise and fall times are generated using a combined PWM and current control. Ramp has 32 PWM steps. For the first 8 steps LED current is decreased to 12.5%. For the remaining steps current is set to 100%. Each step is 3.3 ms long. This result’s the minimum ramp time of 3.3 ms × 32 = 105.6 ms. Figure 22 shows LED current with minimum rise time. When ramp time is increased each PWM step is done multiple times. In the default sequence rise and fall times are set to 528 ms.

    For Q2:

    you can implement breathing function by LP5560 timing sequence control. Please refer to 20 page in the datasheet.