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Class D Switching Power Amplifiers and Power D/A conversion

Supertex MD7120 200V Driver
Supertex MD7120 200V Driver
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Old 7th September 2008, 06:08 PM   #1
Vibeguy is offline Vibeguy  United States
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Default Supertex MD7120 200V Driver

This is a 200V(!) full H-bridge, class-D, audio
amplifier MOSFET driver.It was released on 6-24-08.
I spoke with Rex Caballero, the product specialist, who assured me that the part is in production.
Link to application note: http://www.supertex.com/pdf/app_notes/AN-H61.pdf. They say it will drive MOSFETS "to more than 1.0 MHz"
Of major interest to me would be the ability to power an amp directly offline(~165V) with appropriate opto-isolation, for low frequency applications.Tiny enclosure, BIG power.
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Old 8th September 2008, 12:16 PM   #2
Pafi is offline Pafi  Hungary
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"File not found!"

You mean: On-line.


Nice! Where can you buy it?
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Old 8th September 2008, 10:29 PM   #3
Vibeguy is offline Vibeguy  United States
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You can go to their store to order: http://www.supertex.com/contact_form/shopping.

When I checked, they had 97 in stock, at $6.66(interesting price,eh?).
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Old 9th September 2008, 07:50 AM   #4
luka is offline luka  Slovenia
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Location: in Slovenia :)
Supertex MD7120 200V Driver

Are you sure about price? I seems too low for this kind of IC. Only big diying problem would be the small case, problem for most people
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
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Old 9th September 2008, 09:35 AM   #5
Ouroboros is offline Ouroboros  England
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The price seems about right. After all, the part is little more than two IRS20124 parts in one package, but has the advantage that the drivers have 3A peak drive rather than the 1A of the IRS20124.
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Old 9th September 2008, 05:16 PM   #6
Tekko is offline Tekko
Join Date: Jan 2005
Seem like a nice one

I think i gonna see if they´ll send me a few samples.

Can this package be soldered w soldering iron or will i need soldering paste and oven bake it in place ?
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Old 10th October 2009, 03:14 PM   #7
janaf is offline janaf  Sweden
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Location: Stockholm
Default MD7120 vanished?


Anyone know what happned This chip does not seem to be available any more. No just obsolete, but vanished from the Supertex site. It looked like a really interesting solution so it would be a pity if its down the drain.
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Old 10th October 2009, 04:06 PM   #8
mr_macgee is offline mr_macgee  United States
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It looks like it indeed vanished and never made it past printed hype (Dog & Pony show). There's almost virtually no more info than it's introduction that never happened.

But it did sound interesting.

"The MD7120 can be connected directly to a 200V supply voltage and can drive over 100W output with 90% efficiency.

Its internal core consists of control logic, level translators, a bootstrap-powered high side gate driver and over-temperature, under-voltage and current protection circuits. The thresholds of the current protection for both the high and low sides are resistor-programmable.

The MD7120 has been optimized for parameters critical to Class-D audio performance such as high efficiency and low EMI," states Ahmed Masood, vice president of marketing for Supertex. "Additionally, this MOSFET driver provides up to a 3.0A peak driving current with matched output resistance and channel-to-channel propagation delay for lower total harmonic distortion and noise. The AN-H61 design uses a self-oscillating, second-order, sigma-delta modulator circuit to convert a small analog audio input signal into two, 200 to 800KHz complementary PWM logic signals. There are two diode-capacitor bootstraps to power the high-side MOSFET gate drives. The low-side gate drives are powered directly by the VDD2 voltage. The logic and internal voltage reference circuits are powered by the AVDD voltage supply. The VDD1 is the internal level translator power supply. AVDD and VDD1 are connected to the same voltage as the VDD2. This voltage rail on the demoboard is called VNF and is referenced to VNN. It should be between 9 and 12V. The voltage should be selected according to the size of the power MOSFETs, gate threshold, and PWM frequency of the class-D amplifier."
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