Originally posted by bbem
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Thanks you're right. I corrected the schematic.
2.
Pondering about the driver capabilities of NE555 - just another idea for driving FETs faster and cheap.
The 555 circuit can be used as voltage comparator / driver. The discharge pin can be used in order to add sink current. So we have 200mA source / 300mA sink. An additional pullup resistor can be used inorder to add source current. Value needs to be determined in order to get symmetrical switching at FET side.
You can play additionaly with a resistor (to GND) at pin 5 in order to adjust the threshold voltage.
sample schematic
Please note the different data:
NE555 / LM555
source 200mA / sink 200mA / discharge 100mA / 200ns switch time
vs.
CMOS TLC555 / LMC555
source 10mA / sink 100mA / discharge 100mA / 20nS switch time
The pullup is a MUST inorder to add current to the source driver!
I would recommend to add an individual 555 to every FET placed near to the gate pin.
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