1.Product characteristics

• Compliance with IEEE802.3af & IEEE802.3at standard.
• 42V~57V wide operating voltage range.
• Maximum output power up to 20W; Rated output: 5V/4A.
• The output ripple is less than 150 mV.
• Conversion efficiency can be as high as 87% (input: 48V output)5V@4A).
• Withovercurrent, short circuit, under voltage, surge andother excellent reliability and circuit protection.
• PCBA standard size: 53.5mm*14mm*15mm
• Input/Output: isolate 1500Vdc.
• High reliability: The design meets the 5 million hour average failure interval.

2.Scope of application

• Thin client
• POS system
• Digital signage
• Health care
• Lighting

3.Describe

The module is designed to extract power from conventional Class 5 to Class 6 Ethernet cable twisted pairs and meets the IEEE 802.3at Power-Ethernet (PoE) standard.At the same time, the module allows the power supply category to select "Intermediate Overlap" and "End Overlap" power supply without distinguishing polarity.

Based on the IEEE 802.3at standard, this paper establishes information connection about the connection status, device type, power consumption level of the receiving device PD, and then applies 25W power supply to port compatible devices based on PSE to power the PD through ethernet.

This module DC/DC converter works in a wide input voltage range and low ripple low noise output.The DC/DC converter also has built-in output overload, output short circuit and overtemperature protection, and provides a 1500Vdc (input/output) electrical isolation.

4.Pin definition

Pin	Name	Describe
1	VIN+	If "Intermediate Overlap Method (4, 5, 7, 8,)" is used for power supply, 4, 5 cores are required to connect this pin.If you use "end-to-end crossover (1, 2, 3, 4,)" power supply, 1, 2 cores are required to connect this pin.
2	VIN-	If "Intermediate Overlap Method (4, 5, 7, 8,)" is used for power supply, 7, 8 cores are required to connect this pin.If you use "end-to-end crossover (1, 2, 3, 4,)" power supply, 3, 6 cores are required to connect this pin.
3	NC	Fixed pin.
4	Vout-	4,5 is the negative output of the PD.
5
6	Vout+	6,7 is the positive output of the PD.
7

5. Electrical characteristics

5.1 Absolute maximum rating parameter

No	Parameter	Symbol	MIN	MAX	Units
1	DC Voltage	VCC	42	57	V
2	DC Voltage Surge 1ms	VSURGE	-0.6	80	V
3	Working temperature	TS	-40	80	℃

*Exceeding the above rating may cause permanent damage to the product.Functional operations under these conditions are not recommended.

5.2 Recommended working conditions

5.3 DC Characteristic

No	Parameter	Symbol	MIN	TYP	MAX	Units	Test Opinions
1	Standard Output Voltage	VDC	4.7	5	5.3	V	VIN=48V
2	Output Current（VIN=48V）	PWR	-	4	4.5	A	Wide voltage input 42-57V
3	Power adjustment rate	VLINE	-	0.1	-	%	@50% Load
4	Load Adjustment Rate	VLOAD	-	1	-	%	@VIN=48V
5	Ripple Output Noise	VRN	-	150	250		@Maximum Load
6	Minimum Load	RLOAD	10	-	-
7	Short circuit duration	TSC	-	-	∞	sec
8	Efficiency (load 80%)	EFF	82	87	-	%
9	Isolation Voltage (I/O)	VISO	-	-	1500	VPK
10	Temperature coefficient	Tc	-	0.02	-	%	Per ℃
11	Response	Tr	-	100	200	ms	VIN=48V VOUT=max

1: Typical number is 25 C, nominal voltage is 48V, for auxiliary design only.

2: Output ripple and noise can be reduced by an external filter, see the application instructions.

3: If operated under the specified minimum load, the module emits audible noise and may cause PSE malfunction.

6 Power Classification

WC-PD20C050 uses IEEE802.3at standard and runs with Class 4 (20W) power rating by default.

Define criteria	Cable requirements	Grading parameters	Power Supply Characteristics
IEEE802.3at （PoE Plus）	CAT5 cable or CAT6 cable	Maximum power required for Class4 devices is 13W~25.5W	The DC voltage ranges from 42 to 57V, with a typical value of 48V. Typical operating current is 10~600mA; typical output power: 30W; Class4 rating supported by electrical equipment
IEEE802.3af （PoE）	CAT5 cable or CAT6 cable	Maximum power required for Class5 devices is 40W	The DC voltage ranges from 48 to 57V, with a typical value of 52V. Typical operating current is 10~1300mA; typical output power: 62W
		The maximum power required for Class6 devices is 51W
		The maximum power required for Class7 devices is 62W
		The maximum power required for Class8 devices is 71W