LP8860-Q1: When selecting Ver.B

Koji Hayashi92

Mastermind 7030 points

Part Number: LP8860-Q1

Hi All,

I chose Ver.B because it is 3.3V at a frequency of 300kHz.

But I do not use VSYNC.

In this case, is the LED lit if PWM is low ?

Best Regards,

Koji Hayashi

over 6 years ago

0 Shirley He over 6 years ago

TI__Expert 5475 points

Hi,

Do you use the Version B EEPROM default settings without rewriting the registers?

0 Koji Hayashi92 over 6 years ago in reply to Shirley He

Mastermind 7030 points

HI Shirley-san

Thank you for quick response.

Customers are currently making prototype boards.

Since the preparation of software takes time, at first we will check the system operation with this setting.

I am asking questions because I can not check the operation if the LED does not light.

Best Regards,
Koji Hayashi

0 Shirley He over 6 years ago in reply to Koji Hayashi92

TI__Expert 5475 points

Hi,

If customer uses the B version default setting which enables the VSYNC, the VSYNC signal is definitely necessary to enable the LED current.

0 Koji Hayashi92 over 6 years ago in reply to Shirley He

Mastermind 7030 points

Hi Shirley-san

Thank you for response.

If VSYNC is not enabled, can not the output be boosted as well ?

How far does the status go ?

Best Regards,
Koji Hayashi

0 Shirley He over 6 years ago in reply to Koji Hayashi92

TI__Expert 5475 points

Hi Koji-san,

If there's no VSYNC signal, the boost can work to boost the output voltage. But the LED current sink cannot work. So that the LED can't be turned on.

0 Koji Hayashi92 over 6 years ago in reply to Shirley He

Mastermind 7030 points

Hi Shirley-san

Thank you for quick response.

I understand.

Best Regards,
Koji Hayashi

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LP8860-Q1: When selecting Ver.B