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Switching power adapter circuit technology introduction

source:power adapter     Popular:adapter     release time:2021-04-13 09:23:18     Article author:sznbone    

  Switching power supply has obvious advantages such as low power consumption, high efficiency, and small size. It is widely used in electrical products and electronic equipment. According to the output voltage regulation control method of the circuit, the switching power supply can be divided into pulse width modulation (PWM) and pulse frequency modulation. (PFM), there are three types of wide pulse modulation rate modulation, which are divided into self-excited and other-excited according to the trigger mode. The switching power adapter explained in this article is pulse-width modulation (PWM), which is an external-excited switching power supply. 12V DC regulated voltage for electrical products and electronic equipment, with a rated output current of 6A, suitable for DC input power supply for LCD TVs with a size less than 32 inches.

Switching power adapter circuit technology introduction(图1)

  Second, the driving circuit technology of the switching power supply adapter is explained;

  The driver chip OB2269 used in the switching power supply explained in this article adopts a unique design scheme. The power system has a higher cost performance and can meet the requirements of the masses.

  OB2269 adopts traditional current mode design and has the following characteristics;bag in box custom

  ▲Low standby power consumption: The low power consumption intermittent working mode design not only allows the entire system to easily implement the latest recommended standards of the International Energy Agency under no-load conditions.

  ▲Noise-free work: no audio noise will appear under light load and full load. The optimized system design can make the system work quietly in any working state.

  ▲Lower startup current: VIN/VDD startup current is as low as 4uA, which can effectively reduce the loss of the system startup circuit and shorten the system startup time.

  ▲Lower working current: The working current is about 2.3mA, which can effectively reduce the loss of the system and improve the efficiency of the system.

  ▲Built-in OCP compensation: The built-in OCP compensation function makes it easy for the system to flatten the OCP curve of the system in the full voltage range without increasing the cost, and improve the cost-effectiveness of the system.

  ▲Sound protection function: It has over voltage protection function (OVP), over temperature protection function (OTP), under voltage protection function (UVLO), output overload protection function (OLP), combined with sound protection function.

  ▲MOSFET soft drive: It can effectively improve the EMI of the system.

  ▲Excellent EMI characteristics of OB2269: The built-in frequency jitter design of OB2269 can effectively improve the EMI characteristics of the system and at the same time reduce the EMI cost of the system.


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