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Class D Switching Power Amplifiers and Power D/A conversion

First time with BSC320N20NS3 G on IRS2092
First time with BSC320N20NS3 G on IRS2092
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Old 1st January 2021, 04:22 PM   #1
chchyong89 is offline chchyong89  Malaysia
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Red face First time with BSC320N20NS3 G on IRS2092

This is a small class D project targeting :

1. BTL mode, 2 x IRS2092, driven by OPA1632.
2. Using BSC320N20NS3 G 200Vds, 32mOhm, 22nC Qg
3. Output power still unknown, not going to put heatsink, trying to maximize the copper area for better dissipation.
4. Fault protection by sensing the PWM at low side gate driver.
5. Typical iraump Low/over voltage protection.
6. Reserved resistors & capacitors footprint on PCB for Post filtering feedback attempt, no idea if it works, but would like to give it a try.

7. ACDC 100khz to 150kHz LLC
8. 24V battery backup DCDC 100khz to 150kHz LLC.
Attached Images
File Type: jpg irs2092.JPG (214.1 KB, 133 views)
File Type: jpg LLC.JPG (152.3 KB, 131 views)
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Old 3rd January 2021, 01:54 PM   #2
Baldin is offline Baldin  Denmark
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Nice .... looking forward to hearing your results.
Be aware that BSC320N20NS3 is very fast and that it is recommended to at least make place for a gate bead.
I have tried the TO220 versions, and had massive problems with ringing ... but might just be my pour PCB design

https://www.onsemi.com/pub/Collateral/AND9893-D.PDF

Massive ringing with IPP320N20N3
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Old 4th January 2021, 11:54 AM   #3
kipman725 is offline kipman725  United Kingdom
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Using the surface mount package and kelvin connection for the gate drive will help alot. Another trick is adding Cgs capacitance to increase dv/dt immunity for an increase in gate driver losses. Getting in to 'extreme' measures negative gate drive an be tried.
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Old 13th January 2021, 05:30 AM   #4
chchyong89 is offline chchyong89  Malaysia
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Here are some little update, just managed to powered up the ACDC(LLC) section, current sensing limited the output power to 500W. Because the smd mosfet are yet to arrive, i hook it up with to220 640 mos temporally and running them @ around 350kHz.

-Few things that I noticed are, it outputs solid stable square wave without spikes when using the correct way to measure.

-1W 5.1k VAA/VSS 5v6 zener diode resistors is running very hot, considering to change them into 3W thru hole type resistors.

-Low Side Mos is running very warm(~70c) without heatsink, but high side mos is completely fine without heatsink during freeload. (Aliexpress Red ferrite 22uH)

-once changed to aliexpress sagami clone 22uH, the high and low side Mosfet ran very very hot (>100c) , i am wondering why.

-The output Inductors ran hot after 5 minutes, its operating at 60C and still increasing slowly, might be due to high AC voltage in the core?
Attached Images
File Type: jpg HU.jpg (255.7 KB, 42 views)
File Type: jpg ACDC.jpg (251.7 KB, 42 views)
File Type: jpg IRS.jpg (408.1 KB, 43 views)
File Type: jpg IRSOUTPUT.jpg (272.9 KB, 33 views)
File Type: jpg correctwaytomeasure.jpg (150.9 KB, 23 views)
File Type: jpg Highside mos running Hot.jpg (179.7 KB, 20 views)
File Type: jpg Inductor runninghot.jpg (267.9 KB, 18 views)
File Type: jpg 5k1Reshot.jpg (183.7 KB, 17 views)
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Last edited by chchyong89; 13th January 2021 at 05:32 AM.
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Old 13th January 2021, 07:35 PM   #5
Baldin is offline Baldin  Denmark
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Hi chchyong89

Your edges seem way to soft on the scope.
What Gate resistors are you using?
On you voltmeters you have around +-80V, but your Vpp is only 151V ... where do you lose almost +-5V in idle mode .... something must be wrong, I think
If Aliexpress Red ferrite 22uH, means a true type 2 coil, it should not get more than lukewarm .... I would be a little carefull buying coils off Aliexpress, eBay etc ....

Maybe if you share the schematics ...


/Baldin
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Old 13th January 2021, 10:40 PM   #6
kipman725 is offline kipman725  United Kingdom
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I notice your probe is set to 1x mode, did you have it 10x mode for the measurement? in 1x mode its bandwidth is lower than 10x mode and will round the edges of waveforms.
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