Analog Devices MAX5974C/MAX5969B | Demoboard MAXREFDES1273

Beschreibung

The MAXREFDES1273 is a Power-over-Ethernet (PoE) powered device (PD) and an active clamp forward DC-DC converter (ACFC) that delivers up to 850mA at 48V from 39V to 57V supply voltage. It is designed for the PD system to comply with the IEEE® 802.3af/at standard in a PoE system.

Eigenschaften

• Programmable switching frequency from 100kHz to 600kHz
• Programmable frequency dithering for low-EMI, spread-spectrum operation
• Programmable dead time, PWM soft-start, current slope compensation
• Programmable feed-forward maximum duty-cycle clamp, 80% maximum limit
• Frequency foldback for high-efficiency light-load operation
• Internal bootstrap UVLO with large hysteresis
• 100μA (typ) startup supply current
• Fast cycle-by-cycle peak current-limit, 35ns typical propagation delay
• 115ns current-sense internal leading-edge blanking
• Output short-circuit protection with hiccup mode
• Reverse current limit to prevent transformer saturation due to reverse current

Typische Anwendungen

• PoE IEEE® 802.3af/at Powered Devices, IP Phones, Wireless Access Nodes, Security Cameras
• High-Power PD (Beyond the 802.3af/at Standard), Active-Clamped Forward DC-DC Converters

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers