CHL8214-03CRT

Series:	*
Part Status:	Obsolete

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CHL8214-03CRT Application Field and Working Principle

Introduction

CHL8214-03CRT is a synchronous rectified controller that realizes the conversion of the high-efficiency step-down voltage. It is mainly used for set-top box, LED lighting and other USB PD applications, DC / DC power supplies. The power supply is a synchronous rectified controller. It is suitable for high-efficiency step-down topology such as buck boost, and is mainly used for fields such as set-top box, LED lighting and other USB PD applications.The CHL8214-03CRT is part of the PMIC – Voltage Regulators – DC DC Switching Controllers lineup of products. It is designed with a high-voltage technology and provides various functions such as current balancing, hysteresis control, self-starting protection and soft-start. It has excellent system performance and overload protection. Its power stage is low-noise and high-efficiency, with high switching frequency and low EMI, allowing the system to run at the lowest power consumption level.

Features

The CHL8214-03CRT is a high-performance switching mode power supply controller that combines a low-side MOSFET with a PWM control unit and a current sense amplifier. Its main features include:1. High-Efficiency Power Stage: The power stage is low-noise, high-efficiency, and has high switching frequency and low EMI, allowing the system to run at the lowest power consumption level. 2. Current Balancing: Its PMOS shunts current to the MOSFET drains and the current sense amplifiers create a path with one MOSFET, allowing current sharing between multiple MOSFETs. 3. Synchronous Rectified Control: The CHL8214-03CRT implements a synchronous-rectified control strategy for high efficiency and minimized switching losses. 4. Overload Protection: The CHL8214-03CRT provides an overload protection circuit which prevents excessive load current from damaging the power supply. 5. Hysteresis Control: The CHL8214-03CRT features hysteresis control for improved stability and line transient response. 6. Self-starting Protection: The CHL8214-03CRT provides protection against self-start conditions and a soft-start circuit for the converter output voltage. 7. Low EMI: The CHL8214-03CRT has an integrated EMI filter to reduce electromagnetic radiation emission. 8. Power Supply Monitoring: The CHL8214-03CRT can monitor the power supply output to ensure its stability.

Applications

The CHL8214-03CRT is designed specifically for power supplies. It is suitable for DC/DC converters, set-top box, LED lighting and other USB PD applications that require high efficiency and low EMI operation.

Working Principle

The CHL8214-03CRT controller is based on the pulse-width modulation (PWM) control technique to produce a low-noise, high-efficiency, high-voltage synchronous rectified power stage. This controller has a integrated current sense amplifier, which allows for current sharing between mosfets. When a certain load current is applied, the controller draws a certain amount of load current from each MOSFET, allowing for better current distribution and improved efficiency. It uses a hysteresis control technique to achieve improved line transient response and stability.The CHL8214-03CRT features an overload protection circuit that prevents excessive load current from damaging the power supply and a self-startup protection which prevents self-starting of the converter. The controller also contains a soft-start circuit to minimize output voltage overshoots. Finally, the CHL8214-03CRT is also equipped with an EMI filter to reduce electromagnetic radiation emission. All these features enable this controller to provide a high-efficiency, low-noise synchronous rectified power stage and make it suitable for set-top box, LED lighting and other USB PD applications.

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