5V,2A H bridge help

[tAhm1D]

Hi,
For most of the Mosfets it is normally 8v not 12v. But exceptions are there, please find out some Mosfets known as Logic Level Mosfets which can operate at 5v.

[free]

hi tAhm1D,

I built the circuit from you, but it's not working fine on me.
When I use 24v supply no output voltage, but it's working if the supply about 14 - 16v, stranger..
I replace the mosfet with lower ampere, same result.
I want to build it again.

[tAhm1D]

Hi,
The circuit is supposed to be Ok. Probably you could not select appropriate parts.
Try the same circuit without R9, R10, R11, Q5, Q6 and observe the output. Then, if the circuit is alright, put these parts again and select the proper sense resistor R9. Change its value to observe the output.

[caveman508]

R9 MUST remain in circuit for it to work.

To disable the current limit function, simply disconnect the collector of Q5 & Q6.

Caveman

[ajmain]

You can connect the sources of the low side MOSFETs directly to ground to disable current limit.

[tAhm1D]

Hi caveman508,
ajmain got the idea clearly.  R9 is not required and the sources of the low side Mosfets can be connected directly to ground to disable current limit.