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Dear All members
we are making the 1000+1000w , 2 CHANNEL CLASS S AMplifier to run speckaer of 4ohm load. This is running ok,,,we are stuck one point
1) In case Mosfet ar short the DC voltage will reach to speakers and this can blow the speakers.
How to protect this situation.
In the Power supply line to amplifier (+ / - 70VDC) we have fuse .....can we have better solution to protect the speaker from having DC voltage in case Mosfet are Short
Solved! Go to Solution.
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Hello Yogesh,
I have double checked the function description (application notes) of IR2092S.
It already has the OCP function and you just need to follow the steps and calculate the value of the resistors.
It won't damage the IC. By the way, you have already added the fuse which add another protection in the circuit.
Best regards,
Kieran
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Hello yogeshks1,
1. You should know that IRS2092SPBF is the driver for 500W application. However, your design is 1000W+1000W. Overpower may cause the problem.
2. A DC blocking capacitor C3 should be connected in series with RIN to minimize DC offset in the output. You could try to change the block capacitor of the input to protect the circuit.
Best regards,
Kieran
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Thanks Kieran
Can u pl share document reference ..where i can check the location of C3 and RIN.?
we are using bridge mode to take 1000w
rgds
yogesh singhal
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Hello Yogesh,
1. The Link of product is:
https://www.infineon.com/cms/en/product/power/class-d-audio-amplifier-ic/discrete-class-d-audio-ampl...
2. Download the function description of it
3. See Figure 2
4. You could know more about from the link of 1
Best regards,
Kieran
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Thanks Kieran
We are having C3 in our circuit.
the concern is: If output mosfet is short, than DC supply voltage will come via RFB resistor to Input Pin of IR2092S..and this voltage can damage the device.
how to protect the device in this situation..when mosfet is short... ..
i hope i am able to define the problem
rgds
yogesh singhal
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Hello Yogesh,
1. The key point is that you should prevent the short circuit, so you need to set the right dead-time of two MOSFETS.
2. You may add TVS diode at the output of the circuit parallel with the speaker.
Best regards,
Kieran
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Hello Yogesh,
I have double checked the function description (application notes) of IR2092S.
It already has the OCP function and you just need to follow the steps and calculate the value of the resistors.
It won't damage the IC. By the way, you have already added the fuse which add another protection in the circuit.
Best regards,
Kieran