LM2575HVT-ADJ/LF03 Application Field and Working Principle

LM2575HVT-ADJ/LF03 is a wide-input, monolithic integrated circuit which is specifically designed to provide a feedback control system to effectively regulate low power DC to DC conversions under extreme conditions. It can be used in most applications that require efficient switching in the 12V to 35V operating range. This integrated circuit is a positive voltage independent type, where the input voltage is divided between a voltage feedback monitor (VFB) and the output voltage to regulate it.

This DC to DC switching regulator features a low-power MOSFET-based PFM/PWM controller, adjustable switching frequency, and protection against under-voltage, current limiting, short-circuit shutdown, over-temperature and over-voltage protection. The power management IC is well-suited for low-power applications such as personal computers, laptop charging, and portable instrumentation.

Application Field

The LM2575HVT-ADJ/LF03 switching regulator can be used for a variety of applications, including:

• Robotics and Automation
• Power Supplies
• Telecommunications Systems
• Industrial Control
• Lighting Controllers
• Medical Equipment
• Computer Equipment
• Consumer Electronics

Working Principle

LM2575HVT-ADJ/LF03 employs a low-power MOSFET-based PFM/PWM controller to regulate the input power for the highest efficiency and the lowest power consumption. It monitors the output voltage and adjusts the switching frequency to deliver the desired voltage. The controller provides an adjustable output voltage of 1.235V to 35V.

Under light load conditions, the controller operates as a Pulse Frequency Modulation (PFM) switch to reduce the frequency while providing near full-load efficiency. As the load increases, the controller transitions to a pulse-width modulation (PWM) state to provide regulated voltage under higher load conditions.

The LM2575HVT-ADJ/LF03 integrated circuit also features an under-voltage protection that prevents excessive current or voltage from causing over-temperature or over-voltage conditions. It also has an over-voltage protection function that reduces the duty cycle by 12.5% each time the output voltage reaches its upper limit, preventing it from being driven to risky levels.

The power management IC offers adjustable soft-start, allowing the user to select from a range of soft start times. The regulator also includes under-voltage and current limiting protection, providing quality power and system safety.

Conclusion

The LM2575HVT-ADJ/LF03 DC to DC switching regulator provides efficient, stable and robust management for low power applications in the 12V to 35V operating range. It features a low-power MOSFET-based PFM/PWM controller, adjustable switching frequency, and under-voltage, current limiting, short-circuit, over-temperature, and over-voltage protection. This power management IC is optimized for use in a wide range of applications such as robotics and automation, power supplies, telecommunications, industrial control, lighting controllers, medical equipment, computer equipment, and consumer electronics.