LT3798HMSE#TRPBF

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The LT3798HMSE#TRPBF is a high performance Control Mode PFC power supply. It is designed to provide 10A output current from a wide range of input sources, such as regulated and unregulated AC/DC plug-in power supplies or unregulated DC batteries. The LT3798HMSE#TRPBF has a wide range of applications in the Power Management, Industrial, and Automotive domain. It has a high power efficiency, wide range of operating temperatures, and integrated smart diagnostics system.

Application field

The LT3798HMSE#TRPBF is a high-performance integrated Control Mode PFC power supply. It has a wide range of applications in all types of AC/DC converters, ranging from DC/DC converters, AC/DC converters, linear and offline switchers. It supports the reduction of power losses and standby power consumption thanks to its adaptive frequency, low-ripple current mode reach, as well as its robust soft-start features. The LT3798HMSE#TRPBF has advanced features such as programmable input voltage, current and frequency, power factor correction, line feed control, and fault protection. Its built-in soft start function makes it ideal for applications requiring a smooth turn-on and to reduce inrush current.

The LT3798HMSE#TRPBF is suited for a variety of applications, including automotive, data centers, security systems, industrial, and medical equipment. It provides up to 98.5 % efficiency over line and load conditions. Furthermore, its comprehensive protection including undervoltage lockout, short circuit protection, overcurrent limitation, overvoltage protection, as well as over temperature protection make it suitable for harsh and transient conditions. Finally, its wide temperature range of -40° C to +125° C and an integrated smart diagnostics system make it especially suited for industrial and automotive applications.

Working principle

The LT3798HMSE#TRPBF is a high-performance integrated Control Mode PFC (Power Factor Correction) power supply. It utilizes a buck topology to convert input sources into a specific output. The buck topology modulates the input voltage, enabling higher output voltage and power control. The power conversion is accomplished by a control scheme which modulates pulse widths of the main switch which controls current in the power stages of the power supply. The base frequency is determined by the compensation components, while the secondary loop adjusts the current to higher level resolution and adjusts the peak current. This power supply uses Pulse Width Modulation (PWM) to control the desired output voltage and current.

The PWM Control Loop constantly adjusts the switching frequency to maintain unity power factor for improvements in efficiency and low-ripple current mode reach. The PWM control loop uses the input voltage and the output current as feedback to regulate the switching. The peak current is adjustable via a resistive divider, allowing for accurate current control. Furthermore, the current limits are programmable to prevent the supply from exceeding absolute peak current. The output voltage can be adjusted via an external potentiometer to compensate for the tolerances and temperature drifts in the downstream circuits.

The LT3798HMSE#TRPBF also includes an innovative soft start feature. This feature allows the output voltage to gently ramp up over time, avoiding inrush currents which could overload the input source. It also provides more consistent output power across a broad operating temperature range. This feature is essential for applications which require good output regulation and low start-up stress.

In conclusion, the LT3798HMSE#TRPBF is a high-performance integrated Control Mode PFC power supply. It is designed for a wide range of AC/DC applications, including automotive, data centers, security systems, industrial, and medical equipment. It provides up to 98.5 % efficiency over line and load conditions, making it suitable for harsh and transient conditions. Furthermore, its comprehensive protection and integrated smart diagnostics system make it ideal for industrial and automotive applications. Finally, its innovative soft start feature ensures a smooth turn-on, reducing start-up stress and inrush current.

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