LP8556: can we use difference LED quantity/string in LP8556

Chung SENLIN

Prodigy 80 points

Part Number: LP8556

Can we use different LED quantity in LP8556?

Example:

LED1: 7pcs LEDs

LED2: 8pcs LEDs

LED3-6: disable

LED Vf = 2V

LED current = 50mA/string

regards,

Mark

over 5 years ago

0 Sean Zhou over 5 years ago

TI__Mastermind 22745 points

Hi Mark,

Yes, you can use different LEDs counts for each string, but the efficiency will be low since this adaptive boost converter will boost the output voltage depends on the maximum LED counts.

Regards

Sean

0 Chung SENLIN over 5 years ago in reply to Sean Zhou

Prodigy 80 points

Hi Sean

Thanks and how about below consition, is it ok for LP8556?

Example:

LED1: 8pcs LEDs, 50mA

LED2: 8pcs LEDs, 50mA

LED3: 4pcs LEDs, 20mA

LED4--6: disable

LED Vf = 2V

regards,

Mark

0 Sean Zhou over 5 years ago in reply to Chung SENLIN

TI__Mastermind 22745 points

Hi Mark,

No, you can't set each channel to different current.

RegardsSean

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LP8556: can we use difference LED quantity/string in LP8556