LP8863-Q1: Minimum Current setting through each string

Mubarak Tamboli

Prodigy 30 points

Part Number: LP8863-Q1

Hello,

The minimum current that can be set in each string using RISET is not mentioned in datasheet.

Please reply on

1) Minimum Current that can be set through each string and recommended Resistor value

2) Along with Current Mismatch Between Strings at Lower current settings

For my application I want to set 15mA current through each string.

Waiting for your kind and prompt support.

Thanks and Regards,

Mubarak Tamboli

Cell No: +91 957 966 9662

over 5 years ago

0 Frank Qiu over 5 years ago

TI__Genius 15776 points

Could you tell me the application you need and why you need to set minimum current by R, you can control it by other ways

0 Mubarak Tamboli over 5 years ago in reply to Frank Qiu

Prodigy 30 points

Hello,

I want to use this IC for Back light application.

Detailed Description as below:

1) Number of LEDs per String: 10

2) Strings going to use: 6 Strings

3) Maximum Current through each String: 15mA

4) PWM Duty Cycle: 0 to 100%

As per mentioned in reply by you, what are the other ways to control the current per string ?

Thanks and Regards,

Mubarak Tamboli

0 Mubarak Tamboli over 5 years ago in reply to Mubarak Tamboli

Prodigy 30 points

Hello TI Team,

Waiting for your reply on query.

Regards,

Mubarak

0 Frank Qiu over 5 years ago in reply to Mubarak Tamboli

TI__Genius 15776 points

Hi Mubarak

We don't test the minimum current can be set.

So I recommend you to set Riset 206.5k if you want to set the max current 15mA.

The mismatch will be larger than 1%.

Another way is to set the max current to 150 and duty cycle from 0 to 10%, that can also satisfy you application.And you can adjust the brightness more flexible.

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LP8863-Q1: Minimum Current setting through each string