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High side N channel MOSFET driver ?

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asrock70

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Can you recommend an integrated high side MOSFET driver for 48V power supply.
Alternatively Get a sample solution.
 

Why do you need it to be high side? What are your current and switching time requirements?

John
 

Load have in series thermocouple and must be grounded.
Current is 10A and switching time adequately small

- - - Updated - - -

Load must be grounded and without voltage when transistor is OFF.
Current is 10A, Drain voltage 25V and for driving have 48V.
Switching time adequately small
 

Nobody ?

For a better idea
Seeking something a driver in the picture, but
- faster R1 charging the gate slowly
- energy saving in OFF is current over R1 too large

D.png
 

Although this can drive 8.9A at 85'C ambient and 125'C Tj, you might get more current using 40'C max environment and a bigger heatsink on TO220 and have Tj<<125'C.

Astrid's design has the right approach with push pull drivers, and that IRF can handle +/- 20V Vgs.. However you only need to drive Vgs to 0V and +10V is OK.

You will likely want to add a diode clamp on the load for the negative spikes from inductive wire load.
 

Thanks to all
Use POWER HIGH SIDE SWITCH is interesting idea, but price and versatility still speaks for classical N-MOSFET.
IRF3205Z have 6,5mOhm and price about 0.8$
 

Check out this hight side driver
 

Unfortunately we are missing a full problem specification.

A bootstrap driver like the suggested circuit in post #8 will only work for a pulse application but not for a static switch. So we don't know if it's applicable. For a static switch, you either need an auxilarysupply voltage or DC/DC converter, e.g. a charge pump to generate it.
 

With discreet components, for DC and upto many KHz, suitable for use with microcontroller.
 

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