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level shifter(5V gating signals to 12V)

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haydenlee87

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I am building an H-bridge circuit and I realzied my high side two p-channel will only start to switch on with my 5V duty cycle input.
To make the two p-channel MOSFET completely on, I need 12V gating signals for the two p-channel MOSFET(IRF 9530)

I have to step the amplitude from 5V to 12V. my Vcc to H-bridge is 12V.
frequency is 730hz, fixed.
duty cycle varies from 0% to 90%.

please help me figuring out the level shifter circuit!

Hayden
 

Dear haydenlee
Hi
Your frequency is low and it is simple to do that. for example with an opto coupler or with ICs like ICL7667 .
Best Wishes
Goldsmith
 
More info on goldsmith's ICL7667 comment: Other devices are tsc427 or max427 or TC427 or FAN3327 or similar part. 8 pin dip with 2 devices in it. 5V logic in, VCC up to 18V out.

Some of the manufacturers of these devices: Maxim, Fairchild, TI, Linear Technology, Micrel (the original builder of the parts), even Microchip.

The digikey search is " PMIC - MOSFET, Bridge Drivers - External Switch" // non inverting // 4.5V to 18V supply voltage // 2 outputs. The cheapest parts (TC4427 from microchip) are only $1 from digikey in single quantity.

These are much cheaper or simpler than an opto solution
 

Hi again
BTW : i forgot to say , the analog switches are suitable for this aim , too .
Good luck
Goldsmith
 

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