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Maxim Integrated MAX5974C/MAX5969B | Demoboard MAXREFDES1273
PoE Powered Device and 48V 850mA Active Clamp Forward DC DC Converter Using the MAX5974C and MAX5969B
Overview
| Topology | Forward Converter |
| Input voltage | 39-57 V |
| Switching frequency | 100-600 kHz |
| Output 1 | 48.48 V / 0.85 A |
Description
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.
Features
- 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
Typical applications
- High-Power PD (Beyond the 802.3af/at Standard), Active-Clamped Forward DC-DC Converters
- PoE IEEE® 802.3af/at Powered Devices, IP Phones, Wireless Access Nodes, Security Cameras