Maxim MAX5074, a pulse-width-modulation (PWM) power IC with integrated power MOSFETs, is targeted at isolated power supplies for IEEE 802.3af-compliant, power-over-Ethernet (POE), powered devices such as IP phones, WLAN access points, and IP cameras. The MAX5074 is also ideal for converting -48 V to +3,3 V in power-sourcing equipment (POE), which includes switch/routers and midspans. The device can be used in both flyback- and forward-converter isolated power supplies with a wide ±11 V to ±76 V input-voltage range and up to 15 W output power.
The MAX5074 provides a 'look ahead' signal for driving secondary-side synchronous rectifiers, thus allowing greater than 90% efficiency without resorting to complicated drive schemes and additional discrete components. It includes thermal shutdown. It provides continuous short-circuit protection with hiccup-mode current limit, which reduces power dissipation under persistent overload conditions. The switching frequency is resistor-/capacitor-programmable up to 500 kHz, thus allowing the use of smaller external magnetics and capacitors. These features, together with the integrated MOSFETs, reduce power-supply size and cost for POE applications.
For more information contact CST Electronics, 011 452 0706 or Electrocomp (Value Added Reseller), 011 458 9000.
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