[Modification] We are taming the DELTA DPS-600QB 40A / 12V, 600W, pinout server

I decided to write here on the forum about my exploits. Maybe someone would need such power. Note: I do not take responsibility if something happens to you, the reader, while playing with used power adapters that I am writing about here. A week ago I found a 600W power supply from a good Delta company on Allegro: DPS-600QB for only PLN 49. I bought 2 pieces right away. The power supply at the output allows to "pull" up to 40A from the 12V line and up to 28A from the 5.1V line. The strange 16-pin terminal discouraged me from buying, but I decided to get to these pins, which in a moment. After short tests, it turned out that the 12V and 5.1V lines give the output 11.9V and 5.10V respectively. The power supply is for real very loud , I do not advise spending several hours in its vicinity.

I dismantled the whole thing and started to investigate what the pins from the 4x4 pin are for. Without going into details, I have determined that the pinout looks like this:

From the left, as in the picture below. The two copper terminals are 12V outputs, the next two are ground / GND / RTN, then we have a "mysterious" 4x4 header, the next two are ground / GND / RTN and 5.1V.

4x4 header:
A2, C2, D2, B3, C3, D3, C4 = GND / GROUND - are marked with the sign " * "in my drawing.
A1 = This pin raises my doubts. It is connected to two SMD resistors with a resultant resistance of 100 Ohm. In a word: the pin is of no use to us. The so-called pull down.
B1 = After connecting the power, this pin is high through a 10k pull up resistor connected to 5VSB inside.
C1 = Power_ON works the same as in the ATX power supply. To turn on the power supply, connect this pin to ground. This pin is connected to a 1k resistor inside, then the signal goes to transistor sot-23 and so on.
D1 = POWER_OK on the tested unit, the High signal appears here about 1.1 seconds after switching on with the Power_ON (c1) pin. It is probably an open collector output, watch out for this pin lest you burn the small sot23 transistor when fumbling with the meter ...
B2 = Analog input pin. Applies to the 12V line. After applying a current of 130..180uA to this pin, it causes a change of 12V output voltage linearly. The easiest way to describe it is: 0-130uA U_out_12V = 11.90V but when we give 180uA and more, the output appears about 12.15V. In a word: voltage regulation 12V. We don't have to use this pin, but the voltage will be 11.9V (that's exactly what I have).
A3 = Analog input pin. It applies to the 5.1V line. Same as above, but: current 10..40uA causes a change in the range of 5.10..5.23V. In a word: regulation of the 5.1V line.
The pins below are for the I2C memory soldered to one of the standing PCBs (specifically the larger PCB).
A4 = VSS of 24C02 chip
B4 = SCL
D4 = SDA
I haven't tested thoroughly if sometimes the uC STM7x also hangs on the I2C lines. Between pins B4, D4 and A4 there are 100 Ohm resistors between the chip, just in case. Note: A4 is not connected to GND / RTN ground.

To sum up: For proper operation of the power supply, it is enough to short PWR_ON with ground and hula. The rest are nice additions.
Below I present a photo:
Here is the complete power supply. Huge dimensions (LENGTH x WIDTH x HEIGHT) [CM]: 30.5x20.9x6.9. The folded handle / handle is included in the length.

Yes, Delta shows the parameters.

Inside, after unscrewing EIGHT screws (one under the RF-shield, glued with double-sided tape). We see two beautiful Delta 12V / 2.94A turbines (i.e. cooling takes 30W at maximum speed). We can see the construction here: main PCB and two vertical boards. The larger one contains the ST72264G2 microcontroller, several LM324, LM358 op-amps, LM339 comparator (s), local 5V so-8 stabilizers, ST 2402 series I2C memory (2kB), its E0-E2 pins are connected to VSS, so from what I understand, the chip has an unlocked write (correct if I'm wrong here) and an SO-8 chip type TL384xB or TL284xB (I don't have a photo, I'm looking at the downloaded datasheet).

Output terminals. I managed to notice that the radiator, second from the right, in the photo below heats up more than the others. Three heat sinks in the lower half of the photo below connected to GND / RTN.

Two tiles. The smaller one contains mosfet drivers and full analog op amps and comparators. You can see LM324, LM358, LM339, local regulators and drivers, e.g. MIC4426.

Bottom.

You can see a good PCB layout, where the descriptions did not fit, tables were inserted. On the right you can see 4 pieces of resistance wire connected in parallel and tracks coming directly from them in order to measure the output current. I do not want to lie, but the right side suggests that the 12 V line is implemented as a two-bar converter (because you can see 2 coils and transistors and all this in pairs, symmetrically).

PCB from uC by STM. By the way, the pins protruding upwards one after the other, as in the photo from the left:
1 16MHz sine,
2 I do not remember
3 ICCDATA (24th uC PIN)
4 ICCCLK (25PIN uC)
5 ICCSEL (26PIN uC)
6 VSS / GND / RTN
7 VDD (5V_SB)

Shunt resistor, the so-called "Shunt resistor" with a small value, so as not to disturb the operation of the power supply at several dozen amperes. Looking at the date-codes, the power supply is from mid-2008 (the casing also has a type code, e.g. 0842 (42nd week of 2008)).

I also found circuits on the PCB UCC3895 and active PFC (power factor) controller UC3854 from Texas.

That's enough for now. To sum up: good buy, good design, simple and reliable. But unfortunately very loud!

English:
BASIC way to make it work: just connect the C1 (pwr_on) with GND.

// UPDATE1:
NOTE: this is not a commercial action, I am writing to improve the quality of the forum, so that you can do yourself something useful if you have such a need. I anticipate the question: no, I do not sell these power supplies on Allegro, but I can see that many people have them on display, I also wish you fruitful hunting and trade negotiations //

// ludek //