MAXREFDES1034: High-efficiency TV power supply with MAX17506

The MAXREFDES1034 is an auxiliary power supply for TV applications. This design provides a 5V output and up to 5A of load current for system power of auxiliary functions such as monitoring and control. A wide operating range from 11.5V to 28V allows system designers to adapt this design to their input voltage needs. As with most modern TVs, flat panel screens limit the available area for the converter. This power supply is a low-profile design, which considers modern TV sizes and available space. This design focuses on providing high efficiency while limiting the total height to 6mm.

This design is centered around the MAX17506 peak current- mode controller. The design is tested at 12V and 24V, which are common TV system voltages.

Key Features

• Low-Profile Design (6mm Height)
• 5V/5A Output
• Built-In Soft-Start
• 300kHz Switching Frequency
• PWM Mode
• Bootstrap LDO for Improved Efficiency at High VIN
• Built-In Soft-Start
• Internally Compensated

This board is not available for purchase.

In this document a step-down DC-DC converter using the MAX17506 is demonstrated for a 5V output application. The power supply delivers up to 5A at 5V.

Designed, Built, Tested

This document describes the hardware shown in Figure 1. It provides a detailed systematic technical guide to designing a step-down (buck) DC-DC converter using Maxim’s MAX17506 current-mode controller. The power supply has been built and tested. Design details follow later in this document.

Design Resources