【TOF Laser mosfet driver】

None_feiyu

Expert 1320 points

Other Parts Discussed in Thread: CSD16301Q2

Hi ti,

This is laser mos driver,the TRIG is ILLUM_P signal,From Datasheet,it is reference 3.3V voltage.

I am confused,why mos diver VCCA not connect to 3.3V but to 1.8V?

hope you reply.

thanks&best regards.

over 9 years ago

0 Subhash Chandra Sadhu over 9 years ago

TI__Expert 3800 points

Hi None,

Thanks for pointing this out. "Trig" is a 3.3V level signal whereas we have used a 1.8V VCCA on the level translator. This seems to be an error.
Please connect 3.3V supply to VCCA in your design.

Regards,
Subhash

0 None_feiyu over 9 years ago in reply to Subhash Chandra Sadhu

Expert 1320 points

Hi Subhash,

Thanks for you information.

if i use JDSU'laser,as seem as OPT8241 EVK,when i set VCCA 3.3V voltage, so the VCCB Voltage should set __?__V?

from CSD16301 datasheet，it's Vgs=1.1V,it seem ok set VCCB Votlage ≥1.1V?

Hope you reply.

thanks&regards.

None

0 Subhash Chandra Sadhu over 9 years ago in reply to None_feiyu

TI__Expert 3800 points

Hi None,

VCCB voltage would have to be set to a high enough value such that the Rds for CSD16301Q2 is low enough. As VCCB increases, the MOSFET Rds reduces. So we keep VCCB at a voltage > 1.1V.
You can also attempt both 3.3V and 5V in your board design. It is possible that you get a better response if you use 5V for VCCB.

Regards,
Subhash

0 None_feiyu over 9 years ago in reply to Subhash Chandra Sadhu

Expert 1320 points

Hi Subhash,

Thanks for you information.

0 None_feiyu over 9 years ago in reply to Subhash Chandra Sadhu

Expert 1320 points

Hi Subhash,

maybe it is the same mistake,as before.please see the follow figure.

ILLUM_EN reference 3.3V Power,but the invertor power is 1.8V power.

So I think the invertor power should be change to 3.3V power.

0 Bharath Patil over 9 years ago in reply to None_feiyu

TI__Intellectual 2030 points

Hi,

Yes. You are right. You need to use 3.3V.

Regards

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【TOF Laser mosfet driver】