PN8126F internal provides a complete intelligent protection function, overcurrent protection, overvoltage protection, overload protection, undervoltage protection, overtemperature protection, etc., suitable for small power non-isolated switching power supply.
The power management chip is good or bad only by measuring each pin and its peripheral voltage in the road.
Using the original model instead will compareBetter, if you use other chips instead, the function may not be so perfect.
watts. PN8124F chip integrated pulse width modulation controller and high avalanche capacity power MOSFET, suitable for small power non-isolated switching power supply, power management chip PN8124F provides a complete intelligent protection function, including overcurrent protection, overvoltage protection, overload protection, undervoltage protection, overtemperature protection.
LNK364PN is a low-power high-efficiency off-line switching IC, often used as a power management chip for induction stoves, with high circuit efficiency. The chip can be directly replaced with LNK564PN, or replaced with TNY266, and the first pin is suspended with 0.1UF/63V capacitor to the ground.
lnk362gn pin function is self-power supply, switch control, hysteresis overtemperature protection, power limit, also provides low power AC, DC power conversion.
Power pins: Some of these pins may be used in the chip's power supply, providing positive power (VCC) and ground (GND) connections. Lose,Because. The reasons are as follows: Capacitor damage: The capacitor will be aging or damaged during use, resulting in the furnace can not start or run normally, thus affecting the work of LNK364PN.
Check whether there is 300V voltage in pin 5, whether the coil of the 3 groups of switching transformer is broken, and whether the output load is short-circuited. If all are normal, there should be output voltage. Unless the chip breaks down again.
Replace the new LNK364PN still does not work, the display does not show, open the door working light bulb is not bright, it proves that there is a problem with the circuit or voltage, not the chip, please check the input voltageWhether it is correct, whether there is a short circuit on the secondary side of the power supply, and whether the reverse peak absorption circuit on the primary side is normal.
The microwave oven just snapped, how to change? Open the back cover, change the power safety tube (10A, 1 yuan 1), maybe right away. Can not be asked.
Use VIPER22A, 5678 switch transformer 300V output, 12-pin grounding; Pin 3 is connected to 18V output terminal (3P, 18V-) through 18V regulator diode, and is connected to ground with a 0.01UF magnetic capacitance; Pin 4 is connected to the 18V output through diode 4148 (4P-, 18V), 4 pins and ground to connect a 7-10uF electrolytic capacitor.