1.Product characteristics
- Compliance with IEEE802.3 bt&at standard.
- 48V~57V wide operating voltage range.
- Maximum output power up to 72W; Rated output: 12V/6A.
- The output ripple is less than 200 mV.
- Conversion efficiency can be as high as 92% (input: 48V output)12V@6A).
- Withovercurrent, short circuit, under voltage, surge andother excellent reliability and circuit protection.
- Crusts standard size: 93mm*70mm*25mm
- 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 802.3bt Power-Ethernet (PoE) standard.bt 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 802.3bt 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. Mechanical dimensions
Company（mm）
All the above dimensional errors:（±0.3）
5.Pin definition
| Pin | Name | describe | |
| 1 | PoE VIN | The Ethernet transmission cable can transmit data and electric power at the same time. The input end supports the end and the middle jumper, and supports 100 / 1000M |
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| 2 | DATA VOUT | 100 / 1000M Network signal output | |
| 3 | VOUT LED | Output indicator | |
| 4 | DC VOUT | DC head output port | |
| 5 | DC VOUT | Pin output port | |
6. Electrical characteristics
6.1 Absolute maximum rating parameter
| No | Parameter | Symbol | MIN | MAX | Units |
| 1 | DC Voltage | VCC | 48 | 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.
6.2 Recommended working conditions
| No | Parameter | Symbol | MIN | TYP | MAX | Units |
| 1 | Input voltage | VIN | 42 | 48 | 57 | V |
| 2 | Low Voltage Lock | VLOCK | 37 | — | — | V |
| 3 | Working temperature | TOP | -40 | 25 | 80 | ℃ |
*Applicable only to PS72-5712G maximum operating temperature.
6.3 DC Characteristic
| No | Parameter | Symbol | MIN | TYP | MAX | Units | Test Opinions |
| 1 | Standard Output Voltage | VDC | 11.5 | 12.2 | 12.2 | V | VIN=48V |
| 2 | Output Current（VIN=48V） | PWR | — | 6 | — | A | Wide voltage input 48-57V |
| 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 | 88 | 93 | — | % | |
| 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.
7 Functional Description
7.1 input
PS72-5712G input end with bridge stack ensures input polarity protection, user can choose the connection mode as needed.
7.2 PD Signature
When the module is connected to the cable, it will automatically provide the Power Device (PD) signature to the PSE when needed.The PSE recognizes that the PD is connected to that line and provides power
7.3 Power Classification
PS72-5712G uses IEEE802.3bt standard and runs with Class 8 (71W) 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++） | 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; |
8. PoE Product naming rules
9. Typical applications
This module is used in PSE network cable to convert electric energy to DC-DC to the required voltage of equipment without affecting data signal transmission. It conforms to ieee802.3bt standard and is used by all equipment terminals
10. Test waveform diagram
Typical features：Vout=12
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| Efficiency (Vout = 12 V) | Output voltage (input 48V) |
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| Maximum temperature of components Conditions (ambient temperature: 25℃; Output power: 12V / 6A; frequency: 3H) |
Input voltage & output voltage |
 Noise (VIN = 48V, IO = 6A, 5 ~ 20MHz bandwidth) |
 Power supply agreement |
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 PWM waverform |
 Power Down |
 Switch Waveform |
