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Repair guides and information for air fryers.

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Calling SMPS gurus to help

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I am attempting to repair the power supply of my air fryer. It comes on for a moment and then dies. I have traced the circuit (hopefully correct!). I have checked all the diodes, capacitors and resistors. I have not been able to find out the identity of the 8-pin controller. It looks a bit like the Viper12A but the pins do not match. Can anyone identify it please? Greetings from Western Australia, William

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It is impossible to see the markings on the IC with the naked eye. I have taken a photograph of the IC through my microscope and applied filters to get the best image. It appears to have two sets of numbers - PN6013 and L43A2A12. How does one distinguish between the part number and the production number?

I would be gratefulif anyone can shed some light on this - I need to know what type of controller IC it is.

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Update (05/30/24)

Hello again SMPS Gurus! I have now replaced the PN6013 after replacing all the low ESR electrolytics but still the problem persists!

The voltage across the 4.7mfd capacitor on the high voltage section is stable at 340v (Our mains is 240v)

Upon switch-on the 5v secondary output across the 1000mfd capacitor on the low voltage section reads 5v for a second and then drops off towards zero. A few seconds later it comes back for a second and then drops off to zero, this then repeats.

The sawtooth waveform at the SW connection of the PN6013 does the same thing, goes to full swing and then dies down repeatedly. The voltage across the 220mfd does the same thing, rises to a steady level and then dies down repeatedly.

Any jewels of wisdom?

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Hi @madaboutears

What's the frequency of the 5V output?

To me you are describing a "pulsing" 5V AC output or if you like if the frequency is high enough it is effectively a 5V DC output with a small ripple - bad example maybe but see first waveform diagrams in link

Is this the voltage that is required on the output?

さんによる

Hi jayeff, thanks for your interest.

The whole purpose of this simple little power supply is to deliver 5v 300mA DC from 90 to 240v AC mains. Just like other USB power-source-from-the-mains units. It does that at the moment but only in short bursts about 45 times a minute. A very weird fault.

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@madaboutears

I think that you would need to increase the frequency by altering the IC on/off timing.

At the moment the output is about .75Hz i.e. 60 seconds ÷ 45 so not exactly replicating DC. Usually smps frequency is in the KHz range but it may depend on the design of the circuit and the IC being used

Without seeing the datasheet for the IC I would imagine that the on/off timing would be determined by the 22K Ohm / 1.5 Ohm resistor divider network and the 4.3K ohm resistor + capacitor across the input side.

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Hi @madaboutears

Don't know what type of IC it is. When searching for the p/n all I get is links to datasheets for engines.

However I did find a supplier of the IC.

If you check the image in the link the part has the same information on it as the one you have. Shipping costs far outweigh the cost of the part however.

I found it by searching for PN6013 L43A2A12 and it showed up in the image results at the top of the page.

You may have better luck searching for other suppliers.

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Thank you! It is the right item but no longer available at AliExpress - what a shame!

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@madaboutears it's a MOSFET but still not an easy find. You can try TaoBao or Alibaba (not AliExpress). Here is what I got:

PN6013 Integrated standby power consumption quasi-resonant primary-side controller and high avalanche

Capability Intelligent PowerMOSFET, used for high-performance, peripheral components

Streamlined charger, adapter and built-in power supply. PN6013for

Primary side feedback working mode, optocoupler andTL431. Built-in high

The voltage start circuit can realize the no-load loss of the chip (230VAC)Small

At50mW. In constant voltage mode, using quasi-resonant and multi-mode technology

Remove audio noise so that the system satisfies6level energy efficiency standard, adjustable

The output line compensation function can enable the system to obtain better load regulation;

In constant current mode, the output current and power can be passedCSpin resistance

Make adjustments. The chip provides intelligent protection features, including week-by-week over-current protection, over-voltage protection, open-loop protection, over-temperature protection, output out short circuit protection andCSOpen/short circuit protection, etc

built-in700VHigh Avalanche Capability Smart PowerMOSFET--PN6013

Recommended Products

I. Overview

PN6013Integrated standby power consumption quasi-resonant primary-side controller and high avalanche capability smart powerMOSFET, for high-performance chargers, adapters and built-in power supplies with reduced peripheral components.PN6013 It is the primary side feedback working mode, and the optocoupler andTL431. Built-in startup circuit can realize chip no-load loss (230VAC) is less than50mW. In constant voltage mode, quasiresonance and multi-mode technology are used to remove audio noise, making the system meet6Class energy efficiency standards, the adjustable output line compensation function allows the system to obtain better load regulation; in constant current mode, the output current and power can beCSThe resistance of the pin is adjusted. The chip provides intelligent protection functions, including cycle-by-cycle over-current protection, over-voltage protection, open-loop protection, over-temperature protection, output short-circuit protection andCSOpen/short circuit protection, etc.

POWER MOSFET--

Two characteristics

built-in700VHigh Avalanche Capability Smart PowerMOSFET Built-in starting circuit, less than50mWLoad loss(230VAC) adopts quasi-resonance and multimode technology to meet6level energy efficiency standards

Full voltage input range±5%ofCC/CVAccurate primary side feedback can save optocoupler andTL431

Constant voltage, constant current, and output line compensation are externally adjustable

No additional compensation capacitor required

No audio noise

Intelligent protection function

Over temperature protection (OTP)

VDDUndervoltage & overvoltage protection (UVLO&OVP)

Cycle-by-cycle overcurrent protection (OCP)

CSOpen/short circuit protection (CS O/SP) Open

loop protection (OLP)

Applications

switching power adapter

battery charger

Set top box power supply

Standby power consumption primary side feedback AC to DC conversion

Quad package

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You may get a good answer on Reddit but if you don't I would check with Digikey.com or Mouser.com. Use whatever little data is here to see if you can find an equivalent. Digikey has a good forum that deals a lot with identifying and cross-referencing components.

If you are creative and don't mind changing some of the circuitry, you could try a DK910 (same package, different pinout) or you can again use the data from that and check with the before mentioned places and hunt for an equivalent.

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Thanks again, I have all the data now! Will hunt around to see if I can buy some PN6013s. Will let you know.

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@madaboutears great. Let us know how you are making out with it. If you can't find the PN6013 it is okay sot substitute with equivalent components

さんによる

@ruggb "Sorry, this item is no longer available!"

さんによる

I have just ordered 10 x PN6013 fron a seller on eBay. Should arrive in Western Australia by the middle of next month. Will follow up once I have received and tried. Thank you all for your help and encoragement! William

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Hello Bill and All,

I am reporting back to reveal what the problem turned out to be.

It was the diode RS1M (1N4442) that was intermittent. It provides the VCC for the Smart MOSFET chip.

One tends to measure these diodes last because it requires the disconnection of the transformer winding!

I did not have an SMD replacement but there was enough space for an axial diode of the fast recovery type.

I hope this inspires others to keep going until the job is done!

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You have replaced all the large caps, checked all the diodes and resistor and replaced the controller. The input voltage is stable. All the measured voltages across capacitors rises then slowly decrease. That would be expected if the input voltage to them stopped. Therefore, something must be breaking down and shutting down the controller. Could be a resistor, diode, small cap, transformer or EVEN a dirty PCB. I had a PCB that had a burn on it and the resistance of the carbon shut down the circuit. Grease and/or dirt might do the same thing.

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William さん、ありがとうございました!
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