STE47N50 switching speed

Tekko · 4th August 2012, 09:01 PM

How fast do you think a IR2110 could switch a STE47N50 halfbridge without a external totem pole current booster ?

Myself i estimate 50kHz or less.

Pafi · 5th August 2012, 09:49 AM

50 kHz? So you are asking frequency, not speed. It is thermally limited basically. It depends on gate voltage (Vdd), gate resistance, ambient temperature, packaging (SMD or through hole device, maybe heat sink attached), PCB layout, and gate charge (and some other details). The total gate-drive power consumed is Pg=f*Qg*Vdd*2. It have to be dissipated by the IC, and the gate resistances. The higher the resistance the higher the portion it will dissipate. The IC internal resistance is about 10 ohms (at high temperature), so if the other gate resistances are 10 ohms too, then they will share the power equally. For example 50kHz*550nC*10V*2=0.55W, and max. allowed power dissipation is 1.6W for DIP package, so it is quite tolerable, even with 0 external gate resistance.

4th August 2012, 09:01 PM	#1
Tekko diyAudio Member Join Date: Jan 2005	STE47N50 switching speed How fast do you think a IR2110 could switch a STE47N50 halfbridge without a external totem pole current booster ? Myself i estimate 50kHz or less. __________________ The point of life is to build atleast one audio amplifier before you die.

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5th August 2012, 09:49 AM	#2
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	50 kHz? So you are asking frequency, not speed. It is thermally limited basically. It depends on gate voltage (Vdd), gate resistance, ambient temperature, packaging (SMD or through hole device, maybe heat sink attached), PCB layout, and gate charge (and some other details). The total gate-drive power consumed is Pg=fQgVdd2. It have to be dissipated by the IC, and the gate resistances. The higher the resistance the higher the portion it will dissipate. The IC internal resistance is about 10 ohms (at high temperature), so if the other gate resistances are 10 ohms too, then they will share the power equally. For example 50kHz550nC10V2=0.55W, and max. allowed power dissipation is 1.6W for DIP package, so it is quite tolerable, even with 0 external gate resistance.