source:Industry News Popular:adapter release time:2021-07-02 10:42:10 Article author:sznbone
When the power adapter UC3842 chip is working normally, it is only controlled by the output of the error amplifier and the current detection feedback signal. When the timing capacitor of the oscillator is in the charging state, the oscillator outputs a low potential, which does not control the OR gate. At this time or The output state of the gate depends only on the output of the PWM latch. The output of the PwM latch is compared with the output voltage of the error amplifier and the current feedback voltage through the current comparator and sent to the R terminal of the PwM latch. In this way, the current The output of the detection comparator determines the output state of the UC3842. When the current feedback voltage is lower than the voltage of the error amplifier to the inverting terminal of the current comparator, the current detection comparator outputs a low potential, and the UC3842 outputs a high potential to drive the switch tube to turn on. This indicates The energy transmitted by the converter is not enough, and the transmitted energy must be increased through the conduction of the switch tube; first, when the current feedback voltage is higher than the voltage of the error amplifier to the inverting terminal of the current comparator, the current detection comparator outputs a high potential , UC3842 outputs a high potential to drive the switching tube to turn off. This indicates that the energy transmitted by the converter has reached the requirement in this switching cycle, and there is no need to increase the transmitted energy.
When the error amplifier outputs the highest voltage, the inverting input of the current detection comparator is the highest voltage, which is clamped at 1V. When the current feedback voltage reaches and starts to be greater than 1V, the output of the current detection comparator changes from low voltage to high voltage. Force the UC3842 to output a low potential and turn off the switching tube. In this way, the maximum current of the converter is limited, that is, the maximum input current limit. No matter the output of the converter is working normally or "overcurrent" or short circuit, the current flowing through the switching tube is limited in:
Read recommendations:
S series S450 energy storage mobile power supply
AC-DC output1: 54V/6.1A bare circuit output 2: 12V/3A dual switching power supply
How to choose a power adapter according to your own needs!ac dc power adapter
The latest article
S series S1000 energy storage mobile power supply
2021-03-18S series S900 energy storage mobile power supply
2021-03-18New ABS Fire Shell Gigabit ESD Protection POE Powered Adapter Power Supply 90W POE Injector
2021-03-18ShenZhen Factory OEM ODM AC DC Open Frame Switching Power Supply Manufacturer
2021-03-18130W bare board power supply
2021-03-1880W bare board power supply
2021-03-1872W bare board power supply
2021-03-1872W bare board power supply
2021-03-1860W bare board power supply (54V)
2021-03-1836W Open Frame Power Supply
2021-03-1836W Open Frame Power Supply
2021-03-1830W Open Frame Power Supply
2021-03-1810W Open Frame Power Supply
2021-03-187W Open Frame Power Supply
2021-03-187W Open Frame Power Supply
2021-03-18Amplifier + power supply
2021-03-1060W single power supply
2021-03-10Amplifier + power supply
2021-03-1027W single power supply
2021-03-10Amplifier + power supply
2021-03-1030W power amplifier power supply
2021-03-10144W power amplifier power supply
2021-03-1048W desktop
2021-03-1048W desktop
2021-03-1024W U.S. regulations
2021-03-1018W U.S. regulations 18W Wall-Mounted Power Adapter
2021-03-1018W U.S. regulations18W Wall-Mounted Power Adapter
2021-03-1018W European standard Power Adapter
2021-03-1018W European standard Power Adapter
2021-03-1018W U.S. regulations18W Wall-Mounted Power Adapter
2021-03-10The latest article
What are the types of mobile phone chargers and their functions?
2022-05-21Advantages of switching power adapters
2022-05-21Five core functions that the power adapter can achieve.adapter manufacture
2022-05-20Analysis of the importance of power adapters for notebooks.adapter Processor
2022-05-20Details of switching power supply in maintenance
2022-05-19Understand the precautions of the power adapter and be an expert in electricity safety
2022-05-19This is how the EMC interference of the switching power supply is generated.adapter wholesaler
2022-05-18The relationship between the nominal voltage and current of the power adapter.power adapter price
2022-05-18Five basic functions of notebook power adapters.adapter wholesaler
2022-05-17Lightning surge immunity test method.power adapter price
2022-05-17Switching power supply ripple source and control
2022-05-16Level 6 energy efficiency standard power adapter T series
2022-05-16Children sleeping with pacifiers are prone to tooth decay
2022-05-16Six methods to deal with the heating problem of switching power supply transformer
2022-05-14The principle of flyback switching power supply
2022-05-14Types of thermal protection for power adapters.adjustable power adapter
2022-05-13Summary of common faults of LED switching power supply
2022-05-13The power transistor should be used like this in the power adapter
2022-05-124 modulation methods of switching power supply
2022-05-12Some little knowledge about switching power supply
2022-05-11Laptop Power Adapter Troubleshooting Steps
2022-05-119 classification methods of switching power supply
2022-05-10Advantages and disadvantages of switching power supply current mode
2022-05-10Advantages and disadvantages of switching power supply current mode
2022-05-099 classification methods of switching power supply
2022-05-09Characteristics and working methods of PFC regulated switching power supply
2022-05-07Six maintenance rules for drone lithium batteries.manual charger power adapter
2022-05-07Reasons for Inrush Current in Switching Power Supply Design.adjustable power adapter
2022-05-06The optimal solution of drone power management solution!12w acdc power adapter
2022-05-06Characteristics of Switching Power Adapter Transient Loads
2022-05-05About
Product
Process
News
Recruitment
中文
Online consultation
Online map
中
