Power over Ethernet - PD converter with 5 V 2 A output, standard IEEE 802.3af compliant
This reference design for a simple, low cost 5 V 2 A flyback converter based on the PM8800A device. The PM8800A is a highly integrated device embedding an IEEE 802.3af compliant “Powered Device” (PD) interface together with a PWM controller.It can be successfully used in all low power, low cost PoE applications.
The PM8800A integrates a standard power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices.The PoE interface incorporates all the functions required by the IEEE 802.3af including detection, classification, under-voltage lockout (UVLO) and in-rush current limitation.
PM8800A specifically targets PD with extended power requirement with respect to the limit imposed by the 802.3af standard, embedding a hot-swap MOSFET capable of sustaining twice the current of the 802.3af standard with a programmable DC current limit.
Applications:
- VoIP phones, WLAN access points
- Security cameras
- PoE powered device appliances
- High power (>12.95 W) powered devices
Features
- IEEE 802.3af compliant PD interface
- Works with power supplied from Ethernet LAN cables or from local auxiliary sources
- Line input voltage range: 40 Vdc to 60 Vdc output voltage: 5 Vdc ± 5%
- Output current: 2 A
- Peak-to-peak output ripple: 30 mV
- Efficiency DC-DC full-load: > 86%
- Efficiency overall peak: > 84%
- Transient response ΔVoutpk-pkto 50% load step: < 300m Vpp
- ΔV in load line case: < 0.5%
Ships With
- Reference Design Board