TC4427A (H-bridge), Output current, Long term - Electronic Circuits Projects Diagrams Free

Halo · 6th March 2007, 10:07 AM

Hi,
Can anyone explain how to calculate the output current for long term use on the H-bridge TC4427A?
As you can see the peak current is 1.5A, but the datasheet doesn't mention anything about the long term current. (http://ww1.microchip.com/downloads/e...Doc/21423F.pdf)

My supply voltage is 12v and I get approximately 5V on the output (measured on the motor). The motor resistance is about 10 to 20 ohm.

I have done some test with the motor and can see that the Ampere is about 60mA to 100mA (This may be within the limits for this h-bridge, just won’t to proof it theoretically)

So if someone can make an example of the calculation I would be very grateful!

Thanks

Roff · 6th March 2007, 07:58 PM

Quote:

Originally Posted by Halo

Hi,
Can anyone explain how to calculate the output current for long term use on the H-bridge TC4427A?
As you can see the peak current is 1.5A, but the datasheet doesn't mention anything about the long term current. (http://ww1.microchip.com/downloads/e...Doc/21423F.pdf)

My supply voltage is 12v and I get approximately 5V on the output (measured on the motor). The motor resistance is about 10 to 20 ohm.

I have done some test with the motor and can see that the Ampere is about 60mA to 100mA (This may be within the limits for this h-bridge, just won’t to proof it theoretically)

So if someone can make an example of the calculation I would be very grateful!

Thanks

Did you see the driver resistance specs? That will explain the low voltage on the motor. These parts are not designed to drive motors, they are designed to drive MOSFETs (capacitive loads). Their power dissipation capabilities don't lend them to driving motors.

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6th March 2007, 10:07 AM	(permalink)
Halo	TC4427A (H-bridge), Output current, Long term Hi, Can anyone explain how to calculate the output current for long term use on the H-bridge TC4427A? As you can see the peak current is 1.5A, but the datasheet doesn't mention anything about the long term current. (http://ww1.microchip.com/downloads/e...Doc/21423F.pdf) My supply voltage is 12v and I get approximately 5V on the output (measured on the motor). The motor resistance is about 10 to 20 ohm. I have done some test with the motor and can see that the Ampere is about 60mA to 100mA (This may be within the limits for this h-bridge, just won’t to proof it theoretically) So if someone can make an example of the calculation I would be very grateful! Thanks