Artesyn 3T12AP DC to DC regulator
Hello, a friend asked me to take a look at the DC-DC converter, it has no output power, he told me this is from crane control operations. It should convert from 48VDC to 24VDC, but the output is 0V., I checked the components like diode for a short, but they are all good. Does anybody know where to start? And my big question is should the board start working once i connect 48V automatically, or should there be some kind of "signal" .
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It looked like the output diode pin was not connected, but i see it is connected with the tab not the pin.
You may want to resolder the input, output and return connections, they do not look that good, I would check R9, I can't make out any value
I don't see any control signal, but it may need a load to workLast edited by R_J; 05-27-2025, 07:29 PM. -
Looks like there is an "inhibit" pin (E9) that needs to be grounded to turn it on if you didn't do so already?Last edited by eccerr0r; 05-28-2025, 12:16 AM.Comment
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it looks like shit,
clean it with IPA and then check none of the corrosion has opened any tracks.
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Check the LM723 and see what going on around there. Is the output dead dead, or you getting something like 0.1 or 0.2V?Last edited by CapLeaker; 05-28-2025, 04:43 AM.Comment
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I also found this resistor to look burned, it reads 0.6kOhm but from the color chart it shoud be like 60ohm not in kOhm, am i correctAttached Files...the quieter you become the more you are able to hear...Comment
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Concur. That thing is on the order of 25 tears old, and cleaning it will help see what is what. The PCB looks singed under 1 or more of those 2W resistors. Have you verified the 2N5038 is not shorted or open?
Judging by the model number and the BJT switch device (2N5038), that looks to be a 3T designed by Boschert Inc., ca 1980, when I worked there (Robert "Bob" Boschert was, then, VP Engineering), though not with that project. You may have to create your own schematic. Boschert was bought by Computer Products, which merged with (IIRC) Zytec to form Artesyn, which was bought by ...PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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Well i am cleaning peace by peace and under one transistor found broken trace. Also colector leg was broken, i will replace it and repair the trace, maybe this will do the trick.
2N5038 is fine, not open or shortedAttached Files...the quieter you become the more you are able to hear...Comment
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Hm… MPSA06… PNP transistor. Should be easy to replace. The 2n5038 is quite a hefty NPN transistor for this remote.Last edited by CapLeaker; 05-29-2025, 07:34 PM.Comment
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PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
****************************Comment
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...the quieter you become the more you are able to hear...Comment
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The 2n5038 is a very common 140v NPN type of transistor it crosses over to a lot of other transistor numbers even “modern” TO3 numbers. No problem.Comment
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a BU208A or BU508A is very common here, used in tv flyback circuits.
it may work
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Well i replace MPSA06 and i repair broken trace but still nothing, i check for other broken trace but all seams fine. I have check the NPN 2N5038 and i only have voltage on case of transistor, the pins are 0VLast edited by rtstorm; 06-04-2025, 11:53 AM....the quieter you become the more you are able to hear...Comment
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One of the transistor pins, the emitter, may be connected to Return, so it should have 0V. So the problem is "upstream" from the base, possibly in the LM723 circuit as CapLeaker suggested. I suggest tracing the circuit back to that IC, possibly starting with whether the IC has Vcc.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
****************************
To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
****************************Comment
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Did you replace the MPSA06 with the same NPN or did you use a sub?Comment
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hello,
i have a hp display 2311 to repair, totaly dead
on the board, il have 2 capacitor 470µf that are dead and the 3.3v regulator : ax6630-33
i have no such regulator, can i replace this one with a mic5209-33 (3.3v outpout regulator too) ?
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Hello everyone,
I want to find a replacement for uP0109 8pins, and i found this parts:
uP0109 is "2A Ultra Low Dropout Linear Regulator"
RT9199 is "Cost-Effective, 2A Peak Sink/Source Bus Termination Regulator"
FP6137C is "2A BUS TERMINATION REGULATOR"
can replace uP0109 by RT9199 or FP6137C ? -
Hi everyone,
I’m trying to identify a step-down regulator marked AMCH073. It’s used on the PEX power rail of a graphics card. I can’t find any datasheet or info online.
Here’s what I’ve observed:
• It has a QFN-16 footprint, similar to NB670.
• Pins 1, 2, 15, 16 are connected together and go to the inductor, so likely SW (switch node).
• Pin 9 is connected to GND, which doesn’t match NB670 (where pin 9 is SW).
• Pin 8 also seems to be tied to the same GND plane.
• The chip only says AMCH073, no manufacturer logo or other markings.... -
hello ,for diy voltage injector for short killer/finder -- is it possible to use something like this - LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable
and ampere controller along (to make it zero amps ) with some addons(transistors diodes etc.) for it -- and use some 5v adaptor or 3.3v volt rail of my smps power supply as input and finally get 1v and zero amps for injecting voltage to find out short circuit component ? ..
for source input -- can we use 3.3 -4 volt 18550 battery ?( i have some of those ) and then adding ampere regulator... -
3+1 Voltage Regulator for IMVP-7/VR12 CPUs
Compliant with IMVP-7/VR12, the ISL95831 provides a complete solution for microprocessor and graphic processor
core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers. The first VR can be
configured as 3-, 2- or 1-phase VR while the second output is 1- phase VR, providing maximum flexibility. The two VRs share the
serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two chip approach.
Based on Intersil's Robust Ripple Regulator...11-05-2024, 03:24 PM
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