Mosfet Driver ! - Page 2 - Electronic Circuits Projects Diagrams Free

Blatman Bond · 17th June 2007, 04:13 PM

IR2111 is an Half Bridge driver not H-Bridge.
That kind of IC used for half-bridge power design (switching power supply), the others are, full-bridge, fly back, and forward converter.

Please look at the level shift stage (datasheet block diag), they need more higher voltage to operate normally. The bootstrap diode and caps isn't functional, if the low side mosfet not been activated (the caps charged through diode when output is low and will float higher to supply the high side mosfet Vgs when output is high).

For H-Bridge, you need more higher voltage to drive N-MOSFET (to supply the Vgs). But you may used P-MOSFET (IRF9540) for the high side driver without more voltage needed.

Gate resistor (ordinary 10-15ohm) used to prevent gate oscillation.

NewBie/Jarhead · 17th June 2007, 04:44 PM

You might consider a chip like the Intersil HIP4081, which has an oscillator for producing the voltage for the top MOSFET, and allows you to do 100% duty-cycle on the top MOSFET.

Hero999 · 17th June 2007, 08:12 PM

What are you using this h-bridge for?

If it's for PWM a bootstrap capacitor can be used to drive the high side MOSFETs.

If it's for DC then you need a higher voltage to drive the high side MOSFETs.

You can build a voltage doubler from a 555 timer to drive the high side MOSFETs from.

Inferno · 17th June 2007, 08:35 PM

i m using it to drive a 12v dc turbine from a 5 volts logical circuit...
i took a look on the HIP4081(http://pdf1.alldatasheet.com/datashe...datasheet.pdf)... it looks so easy to use and suitable to the case i have....i want to know something about it... i connect the mosfets directly to the ic outputs ?? without resistors ?
is it fully working with irf540 mosfets and 12v battery ??

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17th June 2007, 04:13 PM	(permalink)
Blatman Bond	IR2111 is an Half Bridge driver not H-Bridge. That kind of IC used for half-bridge power design (switching power supply), the others are, full-bridge, fly back, and forward converter. Please look at the level shift stage (datasheet block diag), they need more higher voltage to operate normally. The bootstrap diode and caps isn't functional, if the low side mosfet not been activated (the caps charged through diode when output is low and will float higher to supply the high side mosfet Vgs when output is high). For H-Bridge, you need more higher voltage to drive N-MOSFET (to supply the Vgs). But you may used P-MOSFET (IRF9540) for the high side driver without more voltage needed. Gate resistor (ordinary 10-15ohm) used to prevent gate oscillation.

17th June 2007, 04:44 PM	(permalink)
NewBie/Jarhead	You might consider a chip like the Intersil HIP4081, which has an oscillator for producing the voltage for the top MOSFET, and allows you to do 100% duty-cycle on the top MOSFET.

17th June 2007, 08:12 PM	(permalink)
Hero999	What are you using this h-bridge for? If it's for PWM a bootstrap capacitor can be used to drive the high side MOSFETs. If it's for DC then you need a higher voltage to drive the high side MOSFETs. You can build a voltage doubler from a 555 timer to drive the high side MOSFETs from. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez

17th June 2007, 08:35 PM	(permalink)
Inferno	i m using it to drive a 12v dc turbine from a 5 volts logical circuit... i took a look on the HIP4081(http://pdf1.alldatasheet.com/datashe...datasheet.pdf)... it looks so easy to use and suitable to the case i have....i want to know something about it... i connect the mosfets directly to the ic outputs ?? without resistors ? is it fully working with irf540 mosfets and 12v battery ??