CHL8325A-35CRT

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CHL8325A-35CRT Application Field and Working Principle

CHL8325A-35CRT is a DC-DC switching controller, which is mainly used in a variety of heavy-duty applications, particularly the power supplies used in servers, networking equipment, and data centers. It is a high-performance controller with a wide input voltage range and low-emission. This switching controller also has some unique features including efficiency optimization, protection, and load-line transients. In this article, we are going to discuss the application field and working principle of CHL8325A-35CRT DC-DC switching controller.

Application Field of CHL8325A-35CRT

The CHL8325A-35CRT is a high-performance switching controller that is capable of operating in a wide variety of applications. It is designed to provide high efficiency, low-noise output, and an accuracy of up to 0.5% to achieve the best maximum load stability and safety. This controller is suitable for 12V to 48V input voltage range, and provides the excellent power solution for datacenter, server, and networking equipment supply.

The main features of CHL8325A-35CRT include power accuracy and wide input voltage range. It has a high frequency maximum of up to 3MHz and excellent transient response to 30V/us and load step response of 0.5%. It enables a wide load current range from 15mA to 30A with programmable external current consumption up to 6A. Also, it has an adjustable voltage output range of 0.9V to 4.95V with up to 0.5% accuracy and bulk voltage up to 8V.

In addition, the CHL8325A-35CRT has an on/off controlled voltage output with maximum 50V/us slew rate during soft-start and an adjustable soft-start window. It also provides an adjustable frequency (30kHz~275kHz) with an external synchronization capability up to 1MHz and forced pulse-by-pulse current limiting up to 1A. It is equipped with a power factor correction (PFC) circuit which enhances the system energy efficiency, and a 36V under voltage lockout which improves the system’s over-voltage protection capability.

Overall, the CHL8325A-35CRT provides excellent power conversion performance and comprehensive solution for high power applications such as monitors and medical devices requiring high reliability.

Working Principle of CHL8325A-35CRT

The CHL8325A-35CRT follows a buck converter topology and works according to a switched-mode power supply principle. In the buck topology, the switching device is operated in a saturated or cut-off state and is controlled by a Pulse Width Modulation (PWM) oscillator. The PWM oscillator is used to vary the width of the pulses while the duty cycle is adjusted with a clock signal. The oscillator generates switching signals which control the switching device to switch between the on and off states.

In the buck mode converter, current flows through the switching device (usually a MOSFET) during the pulse width and the inductor is then charged. After the pulse is finished, the device switches off, allowing the energy stored in the inductor to be transferred to the output circuit. The PWM clock oscillator frequency determines the switching frequency and the duty cycle of the pulse determines the conduction interval between the charging and discharging of the inductor, thus controlling the output voltage.

The CHL8325A-35CRT also includes a voltage feedback circuit to regulate the output voltage. The feedback loop compares the input voltage with the output voltage. If the output voltage is too low, the controller switches on the switching device for a longer duration which increases the output voltage. If the voltage is too high, the controller switches the device off for a longer duration to reduce the output voltage.

In addition, the controller also has a current limiting circuit which limits the peak current taken by the switching device. This prevents the device from being overloaded and also protects the system. It also has a wide range of protections such as over-temperature protection, over-voltage protection, under-voltage protection, and over-current protection.

Conclusion

Overall, The CHL8325A-35CRT is a high-performance DC-DC switching controller which is suitable for a wide range of applications and provides excellent power conversion performance. It has a wide input voltage range, high frequency capability and features such as efficiency optimization, protection, and load-line transients. The CHL8325A-35CRT follows a buck converter topology and follows a switched-mode power supply principle. The PWM oscillator is used to generate the switching signals which control the switching device to switch between the on and off states in order to regulate the output voltage.

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