In recent years, with the popularization of digital technology and the continuous expansion of application scenarios, the semiconductor industry is facing tremendous pressure. Especially against the backdrop of chip shortages, semiconductor companies not only need to produce products with the highest possible quality and minimal defects, but also need to quickly launch innovative products to meet market demand. However, this pressure has also brought new opportunities to the entire industry. In the current environment of domestic substitution, the Chinese semiconductor industry is at a crucial historical period. Shenzhen SLKOR Micro Semicon Co., Ltd. in aspires to become a "leader in domestic semiconductors". SLKOR is continuously striving in technology research and market development, actively promoting the development of the Chinese semiconductor industry. At the same time, SLKOR is also actively promoting semiconductor standardization work, aiming to eliminate technical risks, improve product quality, and ensure a fair competitive environment by establishing unified standards.

With the continuous development of technology, the demand for power supply technology is increasing. PWM (Pulse Width Modulation) switching regulators, as efficient, stable, and reliable power regulators, have been widely used. The SL494CN from Sakemi Semiconductor, as a control circuit commonly used in PWM switching regulators, has unique advantages.

Description

The SL494CN is used for the control circuit of the PWM switching regulator.The SL494CN consists of 5V reference voltage circuit,two error amplifiers,a flip flop,an output control circuit,a PWM comparator,a dead time comparator and an oscillator.This device can be operated in the switching frequency of lkHz to 300kHz.

Features

●Internal Regulator Providesa Stable 5V Reference Supply Trimmed to 5%

●Uncommitted Output TR for 200mA Sink or Source Current

●Output Control For Push-Pull or Single Ended Operation

●Variable Duty Cycle By Dead Time Control (Pin 4) Complete PWM Control Circuit

●On-Chip Oscillator With Master or Slave Operation

●Internal Circuit Prohibits Double Pulse at Either Output

First of all, SL494CN is composed of multiple functional modules. The 5V reference voltage circuit provides a stable 5V reference voltage. The two error amplifiers are used to amplify and compare the input signal and the reference voltage to generate an error signal. The flip-flop is used to receive the error signal and convert it into a PWM modulation signal. The output control circuit controls the output of the switching power supply according to the PWM modulation signal. The PWM comparator is used to compare the PWM modulation signal with the reference voltage and generate the corresponding output signal. The dead time comparator is used to control the dead time of the PWM signal to ensure In the normal operation of the switching power supply, the oscillator generates high-frequency pulse signals, which are used to drive the generation of PWM modulation signals. The above modules work together to realize the control of the PWM regulator.

Secondly, the SL494CN has a wide range of switching frequencies. It can work in the range of 1kHz to 300kHz and can meet the needs of different application scenarios. In addition, SL494CN also has an adjustable dead time. The dead time of the PWM signal can be adjusted through the dead time comparator module to improve the stability and efficiency of the system. The parameters of SL494CN are as follows: VC(V): 40V, Io(mA): 250mA, TSTG(℃): -50~150℃, Package: DIP-16.

Finally, SL494CN has a wide range of adaptability. It is suitable for various PWM regulator applications such as switching power supplies, motor drives and power inverters. Therefore, SL494CN has a wide range of application prospects, whether in home appliances, industrial equipment or aerospace fields.

To sum up, SL494CN, as a control circuit commonly used in PWM switching regulators, has many advantages. In the future, with the continuous development of power supply technology, SL494CN is expected to play an important role in more fields and promote the innovation and progress of PWM regulators.

About SLKOR

With an elite team from prestigious Chinese Tsinghua University and Korean Seoul Yonsei University, Shenzhen Slkor Micro Semicon Co., Ltd. is dedicated to the third generation semiconductor SiC power devices and conventional semiconductor devices. We are strong on the relevant methodologies, new materials, new technologies and new products. Our products cover discrete devices and ICs,  diodes, transistors, power devices, power management chips, and analogue chips etc. Under the strong leadership of Mr. Song Shiqiang, the CEO of Slkor, starts from an IP design house, Slkor is now a national high-tech enterprise covering the R&D, production and sales service of semiconductor devices. Slkor provides quality domestic equivalents of semiconductor from major international players. For prompt services, Slkor has two flagship stores in the world famous hardware valley Shenzhen Huaqiangbei.

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