Maxim MAX5974EETE+T

Неизолированный7 В ~ 26 В

Overview

The MAX5974E/MAX5974F provide control for wide-input-voltage, current-mode PWM, nonisolated, synchronous flyback converters in Power-over-Ethernet (PoE) powered device (PD) applications. The MAX5974EETE+ is well-suited for universal or telecom input range, while the MAX5974F also accommodates low input voltage down to 8.4V. The devices include several features to enhance supply efficiency, including a synchronous MOSFET driver output. The AUX driver drives an output synchronous rectifier to lower conduction losses. Programmable dead time between the AUX and main driver allows for zero-voltage switching (ZVS). Under light load conditions, the devices reduce the switching frequency (frequency foldback) to reduce switching losses. An internal error amplifier with a 1% reference eliminates the need for an external shunt regulator and optocoupler. The programmable frequency dithering feature provides low-EMI, spread-spectrum operation. The MAX5974E/MAX5974F are available in 16-pin TQFN-EP packages and are rated for operation over the -40°C to +85°C temperature range.

Features

Applications

• AC/DC Adaptors/Chargers for E-books
• Adaptors for Portable Media Player
• Adaptors for DSCs
• Set-top boxes
• DVD players
• Records
• Linear Adapter Replacements
• Chargers for cell/cordless phones
• PDAs
• MP3