tlp 250 circuit for driving an igbt

[vinu gopalakrishnan]

i need the circuit of tlp 250 to drive an igbt. its rating is 600v, 10A.
please explain what is the use of the resistors.

 

[Tahmid]

Which resistors are you talking about? Without a diagram of some sort, we don't know for sure what you are talking about. There's one resistor to limit current to the TLP250 LED. There's another for the gate of the IGBT.

Where in the circuit do you have problems? It's so simple! Drive the LED with the drive signal. Make sure you use a current-limiting resistor for the LED. Then, connect pin 8 (VCC) to +V of the drive power supply. Connect pin 5 (GND) to ground. Take the drive output from pin 6 (VO). Use a resistor between pin 6 (VO) and the gate of the IGBT being driven. Make sure you connect a 0.1uF decoupling capacitor across pins 8 and 5.

You should go through the TLP250 datasheet: www.datasheetcatalog.org/datasheet/toshiba/2109.pdf

Hope this helps.
Tahmid.

 

[vinu gopalakrishnan]

thankyou Tahmid...

 

[picgak]

TLP250 can be used only if the switching freq is below 20 Khz

 

[vinu gopalakrishnan]

Which resistors are you talking about? Without a diagram of some sort, we don't know for sure what you are talking about. There's one resistor to limit current to the TLP250 LED. There's another for the gate of the IGBT.

Where in the circuit do you have problems? It's so simple! Drive the LED with the drive signal. Make sure you use a current-limiting resistor for the LED. Then, connect pin 8 (VCC) to +V of the drive power supply. Connect pin 5 (GND) to ground. Take the drive output from pin 6 (VO). Use a resistor between pin 6 (VO) and the gate of the IGBT being driven. Make sure you connect a 0.1uF decoupling capacitor across pins 8 and 5.

You should go through the TLP250 datasheet: www.datasheetcatalog.org/datasheet/toshiba/2109.pdf

Hope this helps.
Tahmid.

I made the circuit using one tlp and one igbt [ie.. fga15n120 ] and could switch the igbt for a resistive load:razz:, but without the pull down resistor. Should i include a pull down resistor?:???:
this is the voltage waveform across the load resistor.

 

[Tahmid]

The gate-to-source resistor is a safety measure. Many have made circuits successfully without this resistor. Some (including me) have faced problems when this resistor was not used. Thus it is safe to just use the resistor.

Hope this helps.
Tahmid.