Data needed for an STK350-530 SIP IC - diyAudio
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Old 17th March 2007, 04:10 AM   #1
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Default Data needed for an STK350-530 SIP IC

Does anybody have the technical specs or datasheets for an STK350-530? It’s from a modern Sony amp, drives two channels from one 15-pin SIP device, runs on approximately +/- 55, is about 1" tall and 1.5" wide, and has a metal back, with a shiny black epoxy covering the front, and no mounting holes.

Thanks much.
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Old 17th March 2007, 04:56 AM   #2
singa is offline singa  Singapore
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http://www.datasheetcatalog.com/data...K350-030.shtml

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Old 17th March 2007, 05:27 AM   #3
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Default Not quite. . .

Oh, if only it were that easy. It is STK350-530, not 030. I checked – the pin-out for the Sanyo 030 isn’t even close to what I have. The STK350-530 device I have does not have an MFR logo on it and the part number is in gold/caps print. There is also an F5C31 date-code and a Pin-1 dot indicator.

I can reverse engineer the pin-out based on the power board the ICs are in, but I’d like to know the specs and see the internal schematic if a data-sheet is out there.

Thanks, though.
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Old 17th March 2007, 11:50 AM   #4
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Default Inside those chips, the series 350, you will have a bootstrapped nice amplifier

This series is not old...and using the beautifull bootstrapped, and old design...that sound great!

regards,

Carlos
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Old 17th March 2007, 01:54 PM   #5
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Default My mistake...is not this one, in special, that is bootstrapped.


I will search the one.

Sorry for that...a mistake.

regards,

Carlos
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Old 31st March 2007, 06:03 PM   #6
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Greetings,

I reverse engineered the STK350-530 schematic from the Sony amp and here’s the pin-out for the 15-pin SIP package:

1) + current-source feed (cap filtered resistor to –Vcc)
2) + V drive out 1
3) – V drive out 1
4) Ccomp 1
5) – Input 1
6) + input 1
7) Ground (substrate)
8) + input 2
9) – input 2
10) Ccomp 2
11) – V drive 2
12) + V drive 2
13) + Vcc
14) + Vcc
15) – Vcc

The output transistors are MN2488 (NPN) and MP1620 (PNP) Sanken TO-218 devices. They are Darlington, 150Vceo, 150W, 10A, 50MHz, and 5K to 30K hFE devices.

Overall topology looks very similar to most Sanyo voltage amp chips including 34dB of gain, inductors with parallel resistors on the outputs, very small values of compensation capacitors, and careful attention to grounding.

Again, any help in identifying more specifics on the STK350-530 device is much appreciated.
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Old 5th April 2007, 07:13 PM   #7
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Question STK350-530 = LM4702?

Another revelation regarding the STK350-530 devices I have. While perusing the audio knowledge universe, I came across the very interesting LM4702 high-voltage stereo driver IC. I then realized it has the exact same pin-out as my STK350-530 ICs that I’d like to experiment with.

So, is Sanyo making their own version of LM4702? Does National Semiconductor make a thick-film/metal substrate version of the LM4702 and package it for Sanyo with the in-house P/N STK350-530? I might post this information on National’s FAQ site and see if they respond (and hope I don’t start any copyright infringement battles between National and Sanyo).

It also turns out what I thought was a + current-source lead is most likely the mute pin. Based on the connection and resistor value, the Sony amp is using the R/C connection to the mute pin as a turn-on/mute delay circuit. Again, this assumes the devices are the same, but considering the devices’ use, specs, and pin-outs, it’s a pretty safe bet.

Attached is National’s drawing.

Again, any comments, inside information, or technical wisdom from the illustrious forum members is much appreciated.
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File Type: jpg 4702packagepins1d.jpg (15.9 KB, 145 views)
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Old 6th April 2007, 12:51 AM   #8
routhun is offline routhun  United States
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Default UPC2581 pin equivalent of LM4702

NEC's UPC2581 is exactly same pin-out of LM4702, and is found in many older sony stereo/ 5-channel receivers. These chips are older than LM4702. I guess national is following these ideas to create a chip that handles all the front-end of an high performance amplifier and leave the output devices to build different amplifier configurations. I know UPC4581 is pin-equivalent of LM4702 but not directly replaceable as it has different package type.
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