In message <felovo$1667$1@opal.icpnet.pl>, DJ <DJ@DJ.net> writes
>
>> I have built many full bridges and single drivers with IRF3710 FETs.
>> Absolute MAX 100 Volts, 57 Amps. The biggest problem with the
>> optos is the turn off times are several microseconds which leaves the FETs
>> in the linear region long enough to generate heat. Use a heat sink!
>
>I am using BUX11 - pretty good and cheap. I am not using optos - never
>had any noise problems. Anyway I just slow down and speed up DC motor,
>not really regulate it's speed and most of the time FETs are either on
>or off instead of toggling and heatsink is not needed.
Umm, isn't the BUX11 an NPN bipolar?
> Otherwise they will probably generate o lot of heat.
--
Clint Sharp
Reply by karthikbalaguru●October 11, 20072007-10-11
On Oct 11, 12:03 am, Vicente <uc...@ono.com> wrote:
> Hi,
>
> I want to implement a speed controller for a motor (PWM). My problem
> is that the motor needs 12V/10A which is too much for connecting it
> directly to a PIC pin output.
>
> I was thinking about using a relay, but I am not sure if it will work
> due to the PWM high ON/OFF frecuency.
>
> =BFWhat can I use? =BFDo you know any commercial PWM controller to use
> with my PIC? =BFPrize?
>
A motor, A 12V supply and A PWM signal =3D solution.
Karthik Balaguru
Reply by DJ●October 11, 20072007-10-11
> I have built many full bridges and single drivers with IRF3710 FETs.
> Absolute MAX 100 Volts, 57 Amps. The biggest problem with the
> optos is the turn off times are several microseconds which leaves the FETs
> in the linear region long enough to generate heat. Use a heat sink!
I am using BUX11 - pretty good and cheap. I am not using optos - never
had any noise problems. Anyway I just slow down and speed up DC motor,
not really regulate it's speed and most of the time FETs are either on
or off instead of toggling and heatsink is not needed. Otherwise they
will probably generate o lot of heat.
Reply by Donald Harris●October 11, 20072007-10-11
"DJ" <DJ@DJ.net> wrote in message news:fekmek$a28$1@opal.icpnet.pl...
>
>>
>> Use the PIC output to drive the gate of a power FET. If the control
>> is in the high side, use an optoisolator to drive the gate.
>>
>
> I've done that recently using FET's full bridge (left-right). I can send
> schematic if you need a reference. Write me on: tomasz @ (remove-this)
> mikran pl
I have built many full bridges and single drivers with IRF3710 FETs.
Absolute MAX 100 Volts, 57 Amps. The biggest problem with the
optos is the turn off times are several microseconds which leaves the FETs
in the linear region long enough to generate heat. Use a heat sink!
Reply by DJ●October 11, 20072007-10-11
>
> Use the PIC output to drive the gate of a power FET. If the control
> is in the high side, use an optoisolator to drive the gate.
>
I've done that recently using FET's full bridge (left-right). I can send
schematic if you need a reference. Write me on: tomasz @ (remove-this)
mikran pl
Reply by ●October 10, 20072007-10-10
On Wed, 10 Oct 2007 12:03:21 -0700, Vicente <uchan@ono.com> wrote:
>Hi,
>
>I want to implement a speed controller for a motor (PWM). My problem
>is that the motor needs 12V/10A which is too much for connecting it
>directly to a PIC pin output.
>
>I was thinking about using a relay, but I am not sure if it will work
>due to the PWM high ON/OFF frecuency.
>
>�What can I use? �Do you know any commercial PWM controller to use
>with my PIC? �Prize?
>
>Thanks ins advance.
"Vicente" <uchan@ono.com> wrote in message
news:1192043001.152647.279620@57g2000hsv.googlegroups.com...
Hi,
I want to implement a speed controller for a motor (PWM). My problem
is that the motor needs 12V/10A which is too much for connecting it
directly to a PIC pin output.
I was thinking about using a relay, but I am not sure if it will work
due to the PWM high ON/OFF frecuency.
�What can I use? �Do you know any commercial PWM controller to use
with my PIC? �Prize?
Thanks ins advance.
Use the PIC output to drive the gate of a power FET. If the control
is in the high side, use an optoisolator to drive the gate.
Don
Reply by Vicente●October 10, 20072007-10-10
Hi,
I want to implement a speed controller for a motor (PWM). My problem
is that the motor needs 12V/10A which is too much for connecting it
directly to a PIC pin output.
I was thinking about using a relay, but I am not sure if it will work
due to the PWM high ON/OFF frecuency.
=BFWhat can I use? =BFDo you know any commercial PWM controller to use
with my PIC? =BFPrize?
Thanks ins advance.