Problem with the H-Bridge VNH5180

Matthias Romfeld · ‎2017-12-02

Posted on December 02, 2017 at 12:18

I having traouble with the H-Bridge 'VNH5180A'. I tried to find the problem now for some days, but I wasn't able to find it.

The H-Bridge haven't the right output voltage.

At the Pins of the Bridge are these voltages. I measured them with an oscilloscope:

designation

Voltage before the resistors

Voltage at the pins of the H-Bridge

CS

0

CS_DIS

0

EN_A

5

IN_A

0

EN_B

5

IN_B

3,3

OUT A | Motor1

DutyCycle 50% | 8 kHz | 0-0,5V

OUT B | Motor2

12

PWM

DutyCycle 50% | 8kHz | 3,3V

DutyCycle 50% | 8kHz | 0-3,3V

Vcc

12

Attached is a picture of my layout, of the datasheet from the H-Bridge and an Osziloscop picture of the H-Bridge output Out_A -Out_B.

Thanks for your help in advance.

#vnh5180 #h-bridge #h-bridge

Nickname15513_O · ‎2018-01-08

Posted on January 08, 2018 at 11:42

Hello

matthias.romfeld

,

thanks for your question.

Please double check that load (also resistive) is connected to the output, this is a standard behavior when no load is connected to the output pin.

Please let us know.

Regards

Davide

Matthias Romfeld · ‎2018-05-10

Posted on May 10, 2018 at 11:39

Thanks for the answer. Sorry for my late reply. We have solved the Problem with your tip

Thanks!