1.Product characteristics

• Compliant with IEEE802.3af standard
• 38V~57V wide operating voltage range.
• Maximum output power up to 10W；Rated output：3.3V/3A.
• The output ripple is less than 150 mV.
• Conversion efficiency can be as high as 87% (input: 48V output)3.3V@3A).
• With over current short circuit under voltage surge and other excellent reliability and circuit protection. 
• PCBA standard size: 56mm*14.3mm*16mm
• 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 conventional Class 5 Ethernet cable twisted pairs and meets the IEEE 802.3af 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 802.3af standard, this paper establishes information connection about the connection status, device type, power consumption level of the receiving device PD, and then applies 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	VA1	This input pin is used in conjunction with VA1 and connects to the centre tap of the transformer connected to pins 1& 2 of the RJ45 connector (RX) - it is not polarity sensitive.
2	VA2	This input pin is used in conjunction with VA2 and connects to the centre tap of the transformer connected to pins 3& 6 of the RJ45 connector (TX) - it is not polarity sensitive.
3	VB1	This input pin is used in conjunction with VB1 and connects to pin 4 & 5 of the RJ45 connector - it is not polarity  sensitive.
4	VB2	This input pin is used in conjunction with VB2 and connects to pin 7 & 8 of the RJ45 connector - it is not polarity  sensitive.
5	AUX	External DC 24V ~ 57V input.
6	AUX
7	Vout-	Is the negative output of the PD.
8	Vout+	Is the positive output of the PD.
9,10	NC	Reserved fixed pin.

5. Electrical characteristics

5.1 Absolute maximum rating parameter

No	Parameter	Symbol	MIN	MAX	Units
1	DC Voltage	VCC	38	57	V
2	DC Voltage Surge 1ms	VSURGE	-0.6	80	V
3	Ambient 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

No	Parameter	Symbol	MIN	TYP	MAX	Units
1	Input voltage	VIN	38	48	57	V
2	Low Voltage Lock	VLOCK	-	-	35	V
3	Working temperature	TOP	-40	25	80	℃

*Applicable only to WC-PD13C033I maximum operating temperature.

5.3 DC characteristic

No	Parameter	Symbol	MIN	TYP	MAX	Units	Test Opinions
1	Standard Output Voltage	VDC	3.2	3.3	3.4	V	VIN=48v
2	Output Current (VIN=48V)	PWR	-	3	3.5	A	Wide voltage input 38-57V
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	82	87	-	%
9	Isolation Voltage (I/O)	VISO	-	-	1500	VPK
10	Temperature coefficient	TC	-	0.02		%	Per ℃
11	Dynamic response	TS	-	60	100	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.