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参数资料
| 型号： | NCP1081SPCGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 1/2页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1081SPCG |
| 设计资源： | NCP1081SPCGEVB BOM NCP1081SPCGEVB Gerber Files NCP1081SPCGEVB Schematic |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，以太网供电（POE） |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 12V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 36 ~ 57V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 250kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1081 |
| 其它名称： | NCP1081SPCGEVBOS |
Test Procedure for the NCP1081SPCGEVB Evaluation Board
Board connectors
Operational description
Normal operation
The NCP1081SPCEVB implements a PoE power splitter. A splitter splits the power from the
data on a PoE enabled network.
When the board operates without faults, the output connector should show a regulated output
voltage of 12V and Ethernet traffic should be passed from J4 to J1.
Fault management
The NCP1081 silicon has a built in thermal protection. If the temperature is too high, the
DC/DC will stop operation and output voltage drops to zero. As soon as the silicon cools down,
the DC/DC starts to operate again. When there’s a heat issue on the board, the output voltage
will slowly oscillate between 0 and 12V.
None of the external components are protected. Most vulnerable components are the switching
MOSFET and secondary rectifying diode. On failure of the MOSFET, the output voltage will
remain zero and the silicon will likely enter thermal protection. The above mentioned oscillation
will not be visible. When the secondary diode breaks down, the output voltage will be zero, or
some noisy level, lower than 12V.
Required test equipment
1. 30 PoE PSE (Power Source Equipment) equipment (Phihong POE30U, Farnell 1266818 )
or 57V,30W lab supply with Ethernet and power mixing board.
2. Oscilloscope
3. 30W load: 5Ohm Rheostat (Farnell 1129931) or 4.8Ohm resistor or programmable
current sink.
4. 2 CAT5, UTP Ethernet cables with RJ45 connectors.
Test Procedure:
1. Zero load, output voltage check.
Connect a scope to the output power solder contacts and set to the scope to the voltage range that
allows measurement of 12V DC.
8/26/2009
-1-
www.onsemi.com
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| NCP1082DER2G | 功能描述:直流/直流开关转换器 POE-PD 13W DC-DC AUX SUPP RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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