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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.
 

jpanhalt

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

John
 

asrock70

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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
 

asrock70

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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
 

SunnySkyguy

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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.
 

asrock70

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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$
 

jony130

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Check out this hight side driver
 

FvM

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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.
 

ALERTLINKS

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

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