2SC datasheet, 2SC circuit, 2SC data sheet: MOSPEC – POWER TRANSISTORS(10A,V,W),alldatasheet, datasheet, Datasheet search. 2SC datasheet, 2SC circuit, 2SC data sheet: TOSHIBA – NPN TRIPLE DIFFUSED TYPE (SWITCHING REGULATOR AND HIGH VOLTAGE. 2SC SILICON POWER TRANSISTOR Components datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated .
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Oct 17, 1.
2SC3306 Datasheet, Equivalent, Cross Reference Search
Dec 26, 7 0. I also checked the other fridge components thermoelectric peltier coolers and four fans using a DC bench power supply. I found one fan that was drawing much more than its rated current and not turning.
I figured this is what blew the power supply. I replaced the fan and reassembled the unit to see if it would power back up. I disconnected the peltier coolers and everything comes to life. Once I disconnect them the power supply comes to life. Once the power supply is up and running, I can plug the coolers back in and the unit cools perfectly. It shows about 1. I also noticed that, once up and running, one of the heat sinked power transistors and its associated V uF input cap is getting very hot.
I checked both input capacitors ESR and found them to be at the datasheet max limit. Not obviously bad, but certainly not good. Could this be causing the problem?
Anything else I should look at? Can anyone tell me what type of SMPS this is? Oct 17, 2. Sep 7, 2, Electrolytic caps are BY FAR the 1 component failure in cheap switcher power supplies because they have high peak currents rushing in and out at high frequency. It’s also where manufacturers pinch pennies and buy cheap. AS to the cooking switch transistor: I also look for resistors that are darkened from heat, don’t see any in your picture.
The other parts that get stressed are the snubber R-C components, hard to pick out without a schematic. Oct 17, 3.
Jun 22, 7, 1, Oct 18, 4. As soon as I get the lager caps in I’ll change them all just dataasheet case. Also, I can’t seem to find the datasheet for these caps anymore. I’d like to check the ESR again since the overheat. Dodgydave – Yes, it is a 12V output supply. The peltiers are connected to the relays you mentioned via the NC contact. The relays are energized to remove power from the peltiers as necessary for proper cooling.
The fans are wired to run all the time. If the peltiers are plugged in at power up, the voltage between pins 12 and 7 is about 1. As soon as the peltiers are disconnected the voltage jumps to 12V and the rest of the unit powers up fans, LCD, etc After that I can plug the peltiers in and the unit continues to run fine and cools quite well.
I just can’t get the power supply to fully power up without manually disconnecting the peltiers then plugging them back in. Is this a common problem with a SMPS? Oct 18, 5. Datashee 18, 6. Clearly didn’t know that. My ESR meter operates at kHz, if I find a cap with a published ESR for that freq on the datasheet is that a switchmode cap or is there another key attribute I’m looking for?
I keep seeing alot if info regarding ripple current, but not ESR. Are these related somehow? Oct 18, 7. Usually with this type of psu, there will be a delay to get the 12v up working, then it will power the peltiers, there must be a slave smpu on the board to give the ic its 12v. Oct 18, 8. Oct 18, 9. Dec 4, It could be that the soft start circuit is not ok.
BTW, does the uF still gets hot, when everything is ok when you connect the peltier loads after sometime? Oct 18, The TL usally has a slave start up oscillator oscthat produces its voltage, then the the ic takes over and feeds the start up osc with sync pulses to produce the desired regulated voltage,so your circuit will be similar to this design ,without the op amp chip.
Output pulses on pins 8,11 feed the slave osc transistors 2sc, they self oscillate at first pulsing the transformer on the right, which feeds the 12 dc supply back to the ic on pin 12 to take over.
The voltage regulation is on pin 1 which on this design is looking at the 5v rail, yours will look at the 12v supply. You can force the ic to kick up by connecting pin 4 to pin 7 ground but as your not getting the 12 supply to start withi would say there is an heavy load datasgeet the slave osc down. Oct 21, Ok, sorry it took me a few days to get this check done. It seems to be getting worse. The ESR of the big caps is climbing with every troubleshooting attempt. I do have a low budget scope, so I checked out pin 4.
Does this make sense to anyone? Same result with another 1uF cap in paralell.
(PDF) 2SC Datasheet PDF Download – A A A POWER TRANSISTORS(10A/V/W)
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