TPS923650: Dimming Issue

Dear Sir,

Could you pls send me the schematic to review? (You can send to lucia-gao@ti.com)

Soumitra Bhattacharjee said:

1) Can the VCC pin (5v) be used in a resistor divider (resistor divider between VCC and ground) to supply the analog voltage to the DIM pin ?

Yes, we can support resistor divider between Vcc and GND. 

Soumitra Bhattacharjee said:

At present im supplying the DIM pin voltage via a DAC and even though i have a small diode between the DAC and the DIM pin, the DIM pin voltage is already 6v. Is this ok ?

6V DIM voltage is unepected. The max recommend Vdim is 5V.

Soumitra Bhattacharjee said:

The VCC pin is 3.3V instead of 5V. Is this expected ?

Vcc voltage should be typical 5V.

Could you pls kindly share us the VIN range, VLED total string voltage, ILED and dimming ratio? What is the application?

BRs

Lucia

Hi Lucia
I've sent the schematic to your email ID. 

Thank you, Sir. Let's discuss by email.

Hi Lucia 

Have you had a chance to confirm the inductor value and the overall schematic?

Dear Sir,

Thank you. Pls kindly let me check the email and review the design. Thank you!

BRs

Lucia

Thank you Lucia, i look forward to your comments.

Sure. Thanks for your patience!