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Suggest 9~40V, 5A H-BRIDGE design

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mailus

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Hi,
I need a H-BRIDGE driver/circuit to drive a motor rated as 12V,3A the motor is controlled by pwm by pic microcontroller. Now I need to choose a driver the input to the driver is 9~40V.it must be with stand 5A current.
 

Hi Mailus
Hi,
I need a H-BRIDGE driver/circuit to drive a motor rated as 12V,3A the motor is controlled by pwm by pic microcontroller. Now I need to choose a driver the input to the driver is 9~40V.it must be with stand 5A current.
Driver ? use four mosfets and two IR2110 ! and a PWM creator circuit .
Best Wishes
Goldsmith
 
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thank you goldsmith,
can you give some related idea or circuit diagram... i use microcontroller to produce PWM.......
 
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You can use 4 MOSFETs in H-bridge configuration and 2 high/low side drivers to drive the 4 MOSFETs.

If you don't need to control direction, but only speed, you don't even need to use H-bridge. You can use 1 MOSFET only.

The microcontroller generates the PWM signal. So this signal is provided to the MOSFET driver input.

Hope this helps.
Tahmid.
 
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This should work

mosfet.gif
 

Thank you Tahmid,
how to choose proper mosfet with proper biasing and proper heatsink.
 

Choose a MOSFET whose current rating >> required current and voltage rating >> required voltage rating. You can calculate the required conduction and switching losses to find the total power loss in the MOSFET and then choose a MOSFET accordingly. To keep conduction loss low, choose MOSFET with low RDS(on). To keep switching loss low, choose MOSFET with low gate charge.

Do you have any MOSFETs in mind? 5A current isn't too much. Any POWER MOSFET should handle it. Mind the voltage rating.

Hope this helps.
Tahmid.
 

for example only,
i have an input of 15v and motor rated as 12v. there is a excessive 3v should be dropped in mosfet and current as 5A. so 15w dropped in mosfet is my calculation is correct...the motor is inductive load then how to turn on and turn off the mosfet safely.
 

No. The motor may be rated at 12V, but that doesn't mean that exactly 12V will be dropped across it. The motor will be supplied with the 15V.
 

thank you for fast reply,
example only,
suppose the input is 20V means the excessive voltage will drop in mosfet (assume Rds-on 2.2ohm).is it correct?

The motor is inductive load then how to turn on and turn off the mosfet safely.
 

Not excessive voltage.
Let's assume RDS(on) of 0.2 ohms.

Say motor has a rated current of 6A at 12V. So, resistance is about 2 ohm. So, if you have 20V supplied with the MOSFET driving the motor, the total resistance will be (2 ohm + 0.2 ohm) = 2.2 ohms. So, current is 9.1A. Conduction loss in MOSFET is I*I*R -> 6*6*0.2 W = 7.2W.

Hope this helps.
Tahmid.
 
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please answer this also,
The motor is inductive load then how to turn on and turn off the mosfet safely.
 

That won't be much of a problem. Just connect the diode across the motor (as shown in post #6).

Connect a gate-to-source resistor, and also a gate current limiting resistor.

Hope this helps.
Tahmid.
 

how to calculate these values.

- - - Updated - - -

how to calculate these values.
 

Estimated values can be used. Accurate values aren't required.

What driver are you using?

A 22 ohm resistor for series current limiting may be used.

For gate-to-source resistor, a 2.2k or 1k ohm resistor can be used.

Hope this helps.
Tahmid.
 

can i drive directly from ic...for example 555 or mcu
 

You can. But you might want to add a simple driver.

Use a totem-pole driver from the 555 output. That should be enough.

For POWER MOSFETs, the gate should be driven with >8V. So, a driver should be used when driving from MCU. This should serve as a level shifter and driver.

Hope this helps.
Tahmid.
 
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thank you tahimd....
 

thank you goldsmith,
can you give some related idea or circuit diagram... i use microcontroller to produce PWM.......
Hi sorry i wasn't in my home for some days , hence i couldn't answer you , but i think Tahmid helped you as well !
A notice :

Hi Tahmid
of 6A at 12V. So, resistance is about 2 ohm
Resistance ? that is not resistance , that is impedance ( complex )
Conduction loss in MOSFET is I*I*R
It is for times that mosfet is on forever ! in fact when you are using PWM , loss power across the mosfet will given from 1/T integral over Rdson *Id^2 dt from zero up to ton . it means your dissipation will be lower .
Best Wishes
Goldsmith
 
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