Electronics > Projects, Designs, and Technical Stuff

Too much capacitance on TB6612FNG control pins.

(1/1)

grrmachine:
Hi,

I was reviewing a motor driver circuit based on TB6612FNG. To my surprise, I found huge capacitance on the motor control pins. Three caps (1206) 22u, 100n, 10n on PWMA, PWMB,AIN1,BIN2 pins.
Is this normal? These pins are controlled by an Arduino UNO. CN1 (PWMA, AIN1) and CN2 (PWMB, BIN2) are driven by PWM. AIN2 and BIN1 are connected through a transistor (inverter circuit). It's implemented in a tiny robot with BO motors.

I'm no expert in electronics, but PWM with that kind of capacitance on those pins seem fishy. Or is this setup normal? And the robot has problems travelling straight. When the same PWM is applied on AIN1 and BIN2 pins, the robot slightly goes off right.
TB6612FNG's control pins draw about 25uA, neglecting the transistor inverter circuit here. The motor response should be sloppy due to the capacitance?
Can someone help me understand this, What's the purpose of those caps there? The robot and UNO are powered by a 2S1P Li-ion battery.

It's my first post here and I am sorry if this is the wrong thread.
Excuse my bad English!

Thanks for any suggestion and help.
My best regards.


 

Navigation

[0] Message Index

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod