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
| No | Parameter | Symbol | MIN | TYP | MAX | Units |
| 1 | Input voltage | VIN | 32 | 48 | 57 | V |
| 2 | Low Voltage Lock | VLOCK | 37 | — | — | V |
| 3 | Working temperature | TOP | -40 | 25 | 80 | ℃ |
*Applicable only to WC-PD25C012J maximum operating temperature.
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 |
