FEDEVEL
Platform forum

Anik , 10-25-2024, 10:46 AM

HI,
Is it possible to use Mosfet gate driver as a PWM level shifter. I need 3.3V pwm from microcontroller to 10V pwm signal for a LED driver which requires 10V pwm. I was wondering to use MCP1416 (https://www.lcsc.com/product-detail/Gate-Drivers_Microchip-Tech-MCP1416T-E-OT_C83775.html) for it. Will it work??
Thank you.

QDrives , 10-26-2024, 12:12 AM

It might. Thing is, we do not know the input of your LED driver....

Anik , 10-26-2024, 04:51 AM

just need 10V PWM signal by 0%, 10%, 20%...... 100% duty cycle for brightness and current does not matter cause 20mA is enough.

QDrives , 10-26-2024, 07:41 PM

"*...to 10V pwm signal for a LED driver...*" -- So is the gate drive **the** LED driver, or is there another driver that needs 10V PWM input? The way you have written is, implies the second.
"*...cause 20mA is enough.*" -- That sounds like the date driver **is** driving the LEDs.
Do note that this gate driver does not have over current, short circuit nor over temperature protection.

Anik , 10-29-2024, 03:49 PM

This is the LED driver datasheet. The datasheet says the pwm input is isolated on the first page and page 6 and 13 has other information about PWM. But dont have enough information about current

QDrives , 10-29-2024, 09:18 PM

The datasheet does state:
"*Source Current on Vdim (+)Pin 90 uA 100 uA 110 uA Vdim(+) = 0 V*"

Do note that my comments on the MCP1416T still stand:
"*Do note that this gate driver does not have over current, short circuit nor over temperature protection.*"
So if a short circuit is made in connecting while powered, it probably will damage your driver.

Anik , 10-30-2024, 05:09 PM

Ok then. Maybe the 10K or more resistor can prevent this issues.

QDrives , 10-30-2024, 08:23 PM

Well, a 1206 1k resistor would be better. It can then drive up to 12mA. And a slight overload if shorted (144mW compared to standard 125mW).

Anik , 12-05-2024, 06:52 PM

This one worked perfectly with 1K and shorted as well.
Thanks.