grizedale
Advanced Member level 3
Hello,
We would like to know what is the maximum switching frequency recomended for the complimentary pair BJT gate driver, driving a high side FET?
...and the BJTs being used are 2N3904
Here is the schematic of the buck LED driver using this drive method.....
(switching frequency ends up being about 160KHz, but actually depends on the capacitor ESR)
Spec of smps:-
Led driver (425mA in each LED)
Vin = 13v
2N3904 Datasheet:-
https://www.fairchildsemi.com/ds/2N/2N3904.pdf
(we can view the gain bandwidth product and switching times etc, but they are all at particular test conditions which arent too exactly relevant)
We would like to know what is the maximum switching frequency recomended for the complimentary pair BJT gate driver, driving a high side FET?
...and the BJTs being used are 2N3904
Here is the schematic of the buck LED driver using this drive method.....
(switching frequency ends up being about 160KHz, but actually depends on the capacitor ESR)
Spec of smps:-
Led driver (425mA in each LED)
Vin = 13v
2N3904 Datasheet:-
https://www.fairchildsemi.com/ds/2N/2N3904.pdf
(we can view the gain bandwidth product and switching times etc, but they are all at particular test conditions which arent too exactly relevant)