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Current rating for Adafruit 16-Channel 12-bit PWM/Servo Driv
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Current rating for Adafruit 16-Channel 12-bit PWM/Servo Driv

by saurabhsaurc on Thu Jul 27, 2017 11:00 am

Hi,

I would like to know what would be the maximum current rating for this board Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685
https://www.adafruit.com/product/815

I want to drive some high power LEDs (say 20W) and vary the voltage via PWM. I suppose the pwm output from this board would need to be amplified by a H-bridge chip such as L298d in order to meet the higher current rating. Am I correct?

Thanks

saurabhsaurc
 
Posts: 2
Joined: Thu Jul 27, 2017 10:57 am

Re: Current rating for Adafruit 16-Channel 12-bit PWM/Servo

by adafruit_support_carter on Sun Jul 30, 2017 6:28 pm

The power output pin is tied directly to the power input on the screw terminal block. See schematic:
https://learn.adafruit.com/assets/36269
so can pass through a fair amount of current. Do you know what your max current will be for your setup?

adafruit_support_carter
 
Posts: 16922
Joined: Tue Nov 29, 2016 2:45 pm

Re: Current rating for Adafruit 16-Channel 12-bit PWM/Servo

by saurabhsaurc on Sun Jul 30, 2017 11:25 pm

Never mind.. I realized that I would be needing an LED driver circuit to connect with the PWM output. Thanks anyway.

saurabhsaurc
 
Posts: 2
Joined: Thu Jul 27, 2017 10:57 am

Please be positive and constructive with your questions and comments.