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As soon as I get the lager caps in I’ll change them all just in case. I also checked the other fridge components thermoelectric peltier coolers and four fans using a DC bench power supply. Usually with this type of psu, there will be a delay to get datasheett 12v up working, then it will power the peltiers, there must be a slave smpu on the board to give the ic its 12v.

(PDF) 2SC3306 Datasheet download

Could this be causing the problem? The voltage regulation is on pin 1 which on this design is looking at the 5v rail, yours will look at the 12v supply. It shows about 1. Dec 26, 7 0.

Do you already have an account? It’s also where manufacturers pinch pennies and buy cheap. Oct 18, 9. 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? Switch Mode Power Supply Posted by zulkifli in forum: Is this a common problem with a SMPS? Oct 17, 1. Oct 17, 3. Oct ddatasheet, I’d like to check the ESR again since the overheat. I disconnected the peltier coolers and everything comes to life.


Oct 18, 4. The peltiers are connected to the relays you mentioned via the NC contact. The fans are wired to run all the time. Anything else I should look at?

transistor+2SC+ datasheet & applicatoin notes – Datasheet Archive

If the peltiers are plugged in at power up, the voltage between pins 12 and 7 is about 1. Sep 7, 2, 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.

Jun 22, 7, 1, Oct 17, 2. Same result with another 1uF cap in paralell. It seems to be getting worse. It could be that the soft start circuit is not ok.

I found one fan that was drawing much more than its rated current and not turning. Oct 18, The ESR of the big caps is climbing with every troubleshooting attempt.

Datasheey soon as the peltiers are disconnected the voltage jumps to 12V and the rest of the unit powers up fans, LCD, etc In this Teardown Tuesday, we are going to take a look at the inner workings of a radar gun! Once I disconnect them the power supply comes to life. I replaced the fan and reassembled the unit to see if it would power back up. After that I can plug the peltiers in and the unit continues to run fine and cools quite well. Dodgydave – Yes, it is a 12V output supply.


Ok, sorry it took me a 2sc330 days to get this check done. Your name or email address: Oct 18, 7.

I also noticed that, once up and running, one of the heat datasheeg 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. Radar Gun If you’re a speeder or sports player you may have experience with one of these! Quote of the day.

2SC3306 Datasheet

Are these related somehow? Can anyone tell me what type of SMPS this is? I figured this is what blew the power supply. Also, I can’t seem to find the datasheet for these caps anymore.

You May Also Like: Once the power supply is up and running, I can plug the coolers back in and the unit cools perfectly. The relays are energized to remove power from the peltiers 2sc3360 necessary for proper cooling. BTW, does the uF still gets hot, when everything is ok when you connect the peltier loads after sometime?