1.Product characteristics

• Compliance with IEEE802.3af standard.
• 42V~57V wide operating voltage range.
• Maximum output power up to 25W; Rated output: 12V/2A.
• The output ripple is less than 150 mV.
• Conversion efficiency can be as high as 87% (input: 48V output)12V@2A).
• Withovercurrent, short circuit, under voltage, surge andother excellent reliability and circuit protection.
• PCBA standard size: 53mm*14mm*15mm
• Input/Output: isolate 1500Vdc.
• High reliability: The design meets the 5 million hour average failure interval.

2.Scope of application

• Video and VoIP Phone
• RFID Reader
• Multiband Access Point
• Surveillance camera 

3.Describe

The module is designed to extract power from traditional class 5 Ethernet cable twisted pair, and meets IEEE 802.3at power Ethernet (POE) standard.

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 and 7 are output negative pole.
5	Vout+	This pin is the output positive pole.
6	NC	Fixed pin.
7	Vuot-	4 and 7 are output negative pole.

 *Since there is no bridge stack access at the power supply input terminal, pay attention to the positive and negative polarity!            

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	11.5	12.0	12.2	V	VIN=48V
2	Output Current（VIN=48V）	PWR	-	2	2.5	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	200	mVp-p	@Maximum Load
6	Minimum Load	RLOAD	10	-	-	mA
7	Short circuit duration	TSC	-	-	∞	sec
8	Efficiency (load 80%)	EFF	85	89	-	%
9	Isolation Voltage (I/O)	VISO	-	-	1500	VPK
10	Temperature coefficient	Tc	-	0.02	-	%	Per ℃
11	Efficiency	Tr	-	150	250	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-PD25C012J uses IEEE802.3at standard and runs with Class 4 (25W) 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	Maximum power required for Class0 devices is 0~12.95W	The DC voltage ranges from 38 to 57V, with a typical value of 48V. Typical operating current is 10~350mA; typical output power: 15.4W； The overload detection current is 350~500mA. Provide 4 Class Power Requests for PD Devices ranging from 3.84 to 12.95W
		The maximum power required for Class1 devices is 0~3.84W
		The maximum power required for Class2 devices is 3.85W~6.49W
		The maximum power required for Class3 devices is 6.5W~12.95W