I am driving two mosfet working in push pull mode(Electronic CFL ballast) directly from microchip microcontroller I/O output with 25mA source current. I have used a gate resistor of 22ohm and gate discharge resistor of 1K. The mosfet I have used is IRFZ44N the datasheet attached.
The problem is the CFL is not turning on with 1K gate discharge resistor.
When I increase the gate discharge resistor to 10K the CFL is working ok.
The switching frequency is 38Khz. Can please anyone tell me why this is happening.http://www.irf.com/product-info/datasheets/data/irfz44n.pdf
Q
g Total Gate Charge 63 nc
Qgs Gate-to-Source Charge 14 nC
Qgd Gate-to-Drain ("Miller") Charge 23 nc
td(on) Turn-On Delay Time 12ns
tr Rise Time 60 ns
td(off) Turn-Off Delay Time 44ns
tf Fall Time 45 ns.
Qgs Gate-to-Source Charge 14 nC
Qgd Gate-to-Drain ("Miller") Charge 23 nc
td(on) Turn-On Delay Time 12ns
tr Rise Time 60 ns
td(off) Turn-Off Delay Time 44ns
tf Fall Time 45 ns.
The problem is the CFL is not turning on with 1K gate discharge resistor.
When I increase the gate discharge resistor to 10K the CFL is working ok.
The switching frequency is 38Khz. Can please anyone tell me why this is happening.http://www.irf.com/product-info/datasheets/data/irfz44n.pdf