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Sci.Electronics.Basics -> mosfet driver question
There are 4 messages in this thread.
You are currently looking at messages 1 to 4.
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I'm thinking of getting a TC1427 mosfet driver to power a motor by
parallel port. I'm about to place the order, then I thought of a few
questions:
Can I drive a 1A load directly from Pin 7 of the TC1427? Or is this a
bad idea?
For greater loads, the gate of a mosfet (say, IRF530) gets connected to
Pin 7, right?
Thanks,
Michael
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Author: ArletDate: 14:51 12-01-07
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mrdarr...@gmail.com wrote:
> I'm thinking of getting a TC1427 mosfet driver to power a motor by
> parallel port. I'm about to place the order, then I thought of a few
> questions:
>
> Can I drive a 1A load directly from Pin 7 of the TC1427? Or is this a
> bad idea?
In general, that's a bad idea. The mosfet driver is optimized for
providing a high peak current into a small capacitive load, such as the
gate of the mosfet. This high current is only sustained for a few ns,
until the gate charge has been moved.
Devices like these are not designed to provide sustained high currents.
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Arlet wrote:
> mrdarr...@gmail.com wrote:
>
> > I'm thinking of getting a TC1427 mosfet driver to power a motor by
> > parallel port. I'm about to place the order, then I thought of a few
> > questions:
> >
> > Can I drive a 1A load directly from Pin 7 of the TC1427? Or is this a
> > bad idea?
>
> In general, that's a bad idea. The mosfet driver is optimized for
> providing a high peak current into a small capacitive load, such as the
> gate of the mosfet. This high current is only sustained for a few ns,
> until the gate charge has been moved.
>
> Devices like these are not designed to provide sustained high currents.
Ok, thanks!
Michael
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Author: Robert WilsonDate: 16:23 14-01-07
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mrdarrett@gmail.com wrote:
> Arlet wrote:
>> mrdarr...@gmail.com wrote:
>>
>>> I'm thinking of getting a TC1427 mosfet driver to power a motor by
>>> parallel port. I'm about to place the order, then I thought of a few
>>> questions:
>>>
>>> Can I drive a 1A load directly from Pin 7 of the TC1427? Or is this a
>>> bad idea?
>> In general, that's a bad idea. The mosfet driver is optimized for
>> providing a high peak current into a small capacitive load, such as the
>> gate of the mosfet. This high current is only sustained for a few ns,
>> until the gate charge has been moved.
>>
>> Devices like these are not designed to provide sustained high currents.
>
>
> Ok, thanks!
>
> Michael
>
Although there is nothing wrong with using the chip to drive a MOSFET to
give you your sustained high current.
Rob.
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