Please about the min gate voltage when Vcc is 12V and 24V respectively for both MOSFET is there any need of pull ups resistance and how much max. current can i draw?..!!I assume you know ho to connect them, right? The two 9540 are the upper MOSFETs, the 540 the lower MOSFETs. At 24V bus voltage you can then not drive the 9540 directly pulling it's gate to ground, maximum Vgs is 20V.
But if Gate voltage increase from 15V it will burn out( i think)....The gate on the IRF9540 needs to be +24V to turn it off and be +12V to +14V to turn it on. A PIC cannot do this.
OK, you are correct the P MOS need supply voltage to turn off...Why can't you understand that the P-channel Mosfets need to have their gate voltages near the +24V supply voltage?
Why can't you understand that a voltage divider must feed the gates?
I will add that snuber circuit also but after complete of H briges...!!Very strange I thought I had this posted... ? Disappeared.
Is that what you had in mind?The 7406 and 7407 have open collector outputs so they need output resistors that make voltage dividers (the max allowed gate-source voltage for the Mosfets is 20V).
What snubber circuit??I will add that snuber circuit also but after complete of H briges...!!
I want to know according to this circuit i need 4 output from uC.....Also, can you please answer the question if you are planning to use high speed PWM? In that case the level shifter from the app note I posted is better suited.
The deadtime shouldn't be a problem in this circuit here but you may consider create an additional one inside the PIC (then you need 4 outputs) or before the 7407 gates.
Yes i think it will be on max speedif you are planning to use high speed PWM? In that case the level shifter from the app note I posted is better suited.
It was for testing purpose..What will you use as 12V switches that can be driven from the PIC?
You are right and now i am testing H-BRIDGES with this schematic....The Mosfets have a high gate-source capacitance and the high value of the 10k resistors will charge and discharge them too slowly for high speed PWM.
I am thinking to use any voltage amplifiers your opinion will be nice, now i want to use it for 24V supply ...What will you use as 12V switches that can be driven from the PIC?
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by Gary Elinoff