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Class D Switching Power Amplifiers and Power D/A conversion

Class D amp with 300v mosfets
Class D amp with 300v mosfets
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Old 20th January 2018, 01:41 AM   #91
kASD is offline kASD
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Evita check this unfriendly version IRS2452AM, it has got +/-200V capability with symmetric current sensing.

Last edited by kASD; 20th January 2018 at 01:44 AM.
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Old 22nd January 2018, 01:26 PM   #92
Eva is offline Eva  Spain
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- Td-on is 385ns typ. Tdoff is 340ns typ. Slow chip. I got fast with IR2110 and opto.
- The current limiting of both channels is hardwired together regardless of BTL. There is a single CSD line. If ch.1 has a bad load, ch.2 does not produce sound. This is not good for 2ch rack amplifier, unless both channel are BTL.
- I suppose external comparator is tolerated by driving COMP pins with logic signal.
- PWM may not be mandatory, but there is no explanation of PWM mechanism.
- Pricing seems adequate.

In the end this is a magnified LF boombox chip. The high propagation delay prevents good amplifier performance at high frequencies. Imagine Behringer or the Chinese relasing an ultra-long excursion subwoofer with ultra high power amplifier, and using this chip and some 600V IGBTs or 300V FET. And maybe non-isolated PSU with speacial speaker driver.
I use to feel like the small child in The Emperor's New Clothes tale

Last edited by Eva; 22nd January 2018 at 01:29 PM.
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Old 25th May 2018, 02:03 AM   #93
endryc1 is offline endryc1
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Sorry, i can`t see the pictures. Please can you put in other site. Sorry for my english. Thanks a lot.
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Old 11th November 2018, 01:59 AM   #94
ViennaTom is offline ViennaTom
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Hello all, is the confusion about strange ROHM -4V abs max rating already solved?
I am trying to simulate a self oscillating class D full bridge using 350V bus voltage and SCT3030, UCC21521C plus bootstrapping hi supply.
I am trying to get some negative gate "for free" by zener diode plus cap in series to gate, maybe -1.5V at the gate, but dependent on duty cycle and no negative voltage at startup. Not sure if the -4V is a mandatory limit. But anyway, I think the ROHMS are good at ~-1V and plus 16 ... 19V (depending on load current).
(I built a simulation using LTSPICE incl. the models of driver and SIC, but no chance to get the simulator to show anything. Just convergence issues, "time step too small", def con... etc...)
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