LP5520:

Nick Hsu

Part Number: LP5520

Hi Sir
We would like to apply LP5520 to do color sequential lighting for LCOS display. The target maximum driving current would be 25mA for each channel.

The reference circuit as follows.

We have 8pcs red LED string on red channel, 4pcs green LED string on green channel, 4pcs blue LED string on blue channel. We will do manual PWM control for RGB lighting.

There are some question for clarification.

1. Does LP5520 support different boost voltage for RGB lighting?

2. Manual PWM control for RGB and frquency up to 360Hz. Is it available?

over 1 year ago

0 Jared Zhou over 1 year ago

TI__Mastermind 19045 points

Hi Nick,

Please refer the below comments:

1. Does LP552 support different boost voltage for RGB lighting?

[Jared]: I think LP5520 can't support this function.

2. Manual PWM control for RGB and frequency up to 360Hz. Is it available?

[Jared]: Yes, it is.

BR, Jared

0 Nick Hsu over 1 year ago in reply to Jared Zhou

Prodigy 10 points

Hi Jared

For question 1, we use color sequential control for separated RGB LED. That means we have different boost voltage for R LED tring, G LED sring, B LED string. Please help to double check if it is available.

thx.

0 Jared Zhou over 1 year ago in reply to Nick Hsu

TI__Mastermind 19045 points

Hi Nick,

Do you mean you will turn on R LED string, G LED string, B LED string in different time? If yes, I think you can set different boost output voltage in different time to meet your requirement.

Since I will be OoO next Monday, I will check it again and give you a definite reply later.

BR, Jared

0 Nick Hsu over 1 year ago in reply to Jared Zhou

Prodigy 10 points

Hi Jarred

Have you confirmed this idea?

0 Jared Zhou over 1 year ago in reply to Nick Hsu

TI__Mastermind 19045 points

Hi Nick,

Sorry to late reply.

If you mean only one color will be on at the same time, then I think you can set the boost output voltage at different time through interface.

BR, Jared

Power management

Power management forum

LP5520: