LM3549: PWM pin setting

Terry Tung

Prodigy 30 points

Part Number: LM3549

Tool/software:

Hi Team

About LCoS design , we plan to use LM3549 for LCoS R/G/B LED control,

the question is :

R/G/B LED duty signal from LCoS panel and connect to LM3549 R/G/B enable pin.

at this time , how to design PWM pin ? pull high and work with MFE register? or that it floating (brightness set via I2C)?

Thanks for help

over 1 year ago

0 Jared Zhou over 1 year ago

TI__Mastermind 20515 points

Hi Terry,

Thanks for reaching out!

Can you please tell me why customers choose LM3549? Can you please tell me what's the end equipment and customer? Thanks!

BR, Jared

0 Terry Tung over 1 year ago in reply to Jared Zhou

Prodigy 30 points

Consider LT and price, so purchase recommended this solution,Our products are more like AR glasses so LCoS will be use to projector image .

0 Jared Zhou over 1 year ago in reply to Terry Tung

TI__Mastermind 20515 points

Hi Terry,

Actually, I am wondering why this application needs the external EN pin to enable and disable output since it already has the interface to control the output. Can you please help me figure it out? Thanks for your answer!

Btw, for the PWM pin, I think you can connect it to GND or left it floating if you don't use it.

BR, Jared

0 Terry Tung over 1 year ago in reply to Jared Zhou

Prodigy 30 points

May i have your e-mail address , let's discuss by mail.

0 Jared Zhou over 1 year ago in reply to Terry Tung

TI__Mastermind 20515 points

jared-zhou@ti.com

Power management

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LM3549: PWM pin setting