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Hi,
Change the 1N4007 to UF4007 or FR157.
Finally, i would suggest the remover of additional driver used (tip41 and tip42).
The tlp250 can drive the 3 mosfet.
Hi,
Change the 1N4007 to UF4007 or FR157.
Finally, i would suggest the remover of additional driver used (tip41 and tip42).
The tlp250 can drive the 3 mosfet.
Irfb4110 has gate charge of 210nC max and rise time of 67nS shouldn't my gate current be 210/67 = 3.13A. And my tlp250 can only source .5A and sink 1.5A .
Note, the current output of TLP250 as stated in the datasheet is 0.5A minimum to 1.5A maximum.
if I may ask! why did you use 67nS for the gate charge calculation?
What is the Frequency of your generated PWM or SPWM?
MOSFET is a voltage-driven device, So the magnitude of current you stated above (3.13A) is out of design.
The trick is that the higher the switching frequency, the higher the gate current to charge the gate.
Finally, i had use 6 x irfb4110 parallelled mosfet in an hbridge configuration using tlp250 as mosfet driver, running spwm frequency at 20khz.
Good luck.
Meanwhile, TLP350 is available with higher driving current above 2A. However, you circuit need modification. Eg Remove the diode connected to transistor. Take it supply from the tlp250.
Also, use transistors that is of 2A and high frequency ration like 2s2655(npn)
Note, the current output of TLP250 as stated in the datasheet is 0.5A minimum to 1.5A maximum.
if I may ask! why did you use 67nS for the gate charge calculation?
What is the Frequency of your generated PWM or SPWM?
MOSFET is a voltage-driven device, So the magnitude of current you stated above (3.13A) is out of design.
The trick is that the higher the switching frequency, the higher the gate current to charge the gate.
Finally, i had use 6 x irfb4110 parallelled mosfet in an hbridge configuration using tlp250 as mosfet driver, running spwm frequency at 20khz.
Good luck.
My pwm frequency is 16kHz. I have removed the second driver using tip 41&42 transistors but yet I still get 6.8-7.8VAC at my high side outputs but at my low sides I get BTW 10.4-11.2VAC which seems OK . by the way I am prototyping on veroboard .
Note, the current output of TLP250 as stated in the datasheet is 0.5A minimum to 1.5A maximum.
if I may ask! why did you use 67nS for the gate charge calculation?
What is the Frequency of your generated PWM or SPWM?
MOSFET is a voltage-driven device, So the magnitude of current you stated above (3.13A) is out of design.
The trick is that the higher the switching frequency, the higher the gate current to charge the gate.
Finally, i had use 6 x irfb4110 parallelled mosfet in an hbridge configuration using tlp250 as mosfet driver, running spwm frequency at 20khz.
Good luck.
Could it b an error in my connection of the high side because my low side seems ok with 10.4-11.2vat low side but at high side í still get a low voltage 6.7Vac to 7.8Vac . I am using veroboard to test could u show me the connection by redrawing the schematic please!
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