LED driver recommendation

Jerry Hsueh

Expert 2730 points

Other Parts Discussed in Thread: LP8557

I want to a PWM LED driver, SPEC as below. Is there a suitable LED driver recommendation?

1, support 3 parallel 10 series, total 30 LEDs

2, one way of 3 parallel LED maximum current > 80mA (two output drives one way LED is also OK).

3, the output OVP voltage > 40V;

4, PWM dimming mode, PWM frequency need to support 75Hz

5, have enable pin

thank you.

Jerry,

over 7 years ago

0 Shirley He over 7 years ago

TI__Expert 5475 points

Hi Jerry,

May I ask what the input voltage range is and what the application of the LED driver is? Thanks.

Best Regards,
Shirley

0 Jerry Hsueh over 7 years ago in reply to Shirley He

Expert 2730 points

Hi Shirley,

Input voltage range is 3.6V~12V.
The application of the LED driver is for LCD backlight in VR.
Thank you,

Jerry

0 Jerry Hsueh over 7 years ago in reply to Jerry Hsueh

Expert 2730 points

Hi Shirley,

PWM minimum duty need to operate more than 10%.

Jerry

0 Jerry Hsueh over 7 years ago in reply to Jerry Hsueh

Expert 2730 points

Hi Shirley,

Currently we use Richtek RT8532 for LED driver , but have two issues.
1. Sometimes it triggers current protection and screen flickered.
2. Sometimes it was shuntdown in minimum frequency 75Hz.

So we want to change a suitable LED driver. Can TI LP8557 replace it?

thank you.

Jerry

0 Shirley He over 7 years ago in reply to Jerry Hsueh

TI__Expert 5475 points

Hi Jerry,

The appropriate engineer has been notified of your question and will reply to you later. Thanks for your patience.

0 Jerry Hsueh over 7 years ago in reply to Shirley He

Expert 2730 points

Hi Shirley,

Is there any new update?
Thank you

Jerry

Power management

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LED driver recommendation