CHL8328-28CRT

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Part Status:	Last Time Buy

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Introduction

CHL8328-28CRT is a special purpose voltage regulator which is composed of integrated circuit (IC) and supporting components for DC-DC applications. It features a unique architecture that provides higher efficiency, better transient response and higher dynamic range than most of other voltage regulators. It is widely used in applications such as industrial laptops, portable medical devices, and automotive down converters. This article will discuss the application field and working principle of CHL8328-28CRT.

Application Field of CHL8328-28CRT

CHL8328-28CRT voltage regulator offers a high precision voltage regulation circuit and a wide operating range with the advantage of high output current capability. This makes it suitable for a broad range of applications. It has been adopted in various industrial laptops, portable medical devices, and automotive down converters.For industrial laptops, CHL8328-28CRT regulates power delivered to the processor, memory and peripheral devices in a very precise manner. It is available in different forms, such as a step-down (buck) regulator and a pulse-width modulation (PWM) regulator, providing a specific solution to every type of application.Similarly, CHL8328-28CRT can be used in portable medical devices. Its high current accuracy ensures reliable operation and long-term stability demanded in sensitive medical devices. It is often used in medical imaging equipment, powered patient beds and portable therapy and vital-sign monitoring devices.Additionally, CHL8328-28CRT can also be used in automotive down converters. It is often utilized for regulated 12V to 10V or 5V conversion or for generating a precision low voltage for on-board communication interface. Due to its very high operating temperature range, CHL8328-28CRT is able to keep the automotive power system running within normal parameters even under severe operating conditions.

Working Principle of CHL8328-28CRT

CHL8328-28CRT voltage regulator uses a three-transistor forward converter structure to achieve a high output current capability and a wide operating range. It uses an input voltage range from 4.5V to 18V and a regulated output voltage range from 0.8V to 3.3V to support a sweep of load conditions.The IC is composed of a bi-directional error amplifier, a voltage reference, a N-channel MOSFET and two Schottky diodes. The three-transistor forward converter uses the N-channel MOSFET to control power flow. The MOSFET is enabled/disabled by a control signal generated on-chip, which controls the current through the inductor. When the MOSFET is enabled, stored energy in the primary winding current charges the output capacitor, generating the regulated output voltage. When the MOSFET is disabled, the stored energy in the inductor is released, which is then converted to output current.The operation of the CHL8328-28CRT is monitored and adjusted by an internal feedback loop. The error signal is generated by the differential amplifier, which compares the internal reference voltage (1.212V) to the output voltage and produces an error signal based on the difference between the two. If the output voltage is different from the internal reference voltage then it causes the error. The error signal is then used to control the duty cycle to regulate the output voltage. The duty cycle is calculated by the controller using voltage information from the load and the feedback.

Conclusion

This article has introduced application field and working principle of CHL8328-28CRT voltage regulator. CHL8328-28CRT has a wide operating range and high output current capability. It is widely adopted in different application such as industrial laptops, portable medical devices and automotive down converters. It uses a three-transistor forward converter structure with N-channel MOSFET to control power flow. The internal feedback loop adjusts the duty cycle to regulate the output voltage.

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