PM8803 High efficiency integrated IEEE 802.3at PoE-PD interface and PWM controller type 2 PSE indicator, plus support for forward active clamp topology
The PM8803 integrates a standard compliant Power over Ethernet (PoE) interface and a current mode PWM controller to simplify the design of the power supply sections of all powered devices. The PoE/PoE+ interface incorporates all the functions required by the IEEE 802.3at including detection, classification, undervoltage lockout (UVLO) and in-rush current limitation.
The PM8803 specifically performs IEEE802.3at Layer1 hardware classification, providing an indication of Type 2 PSE successful detection to the rest of the system.
The PM8803 has been designed to work with power either from the Ethernet cable or from an external power source such as a wall adapter, ensuring prevalence of the auxiliary source with respect to the PoE. The DC/DC section of the PM8803 features a programmable oscillator frequency, an adjustable slope compensation, dual complementary low-side drivers, programmable dead time and an internal temperature sensor.
The PM8803 targets high-efficiency conversion at all load conditions supporting flyback, forward, forward with active clamp converters and synchronous rectification
技术特性
- IEEE 802.3at compliant PD interface
- Works with power supplied from Ethernet LAN cables or from local auxiliary sources
- Successful IEEE802.3at Layer1 classification indicator
- Integrated 100 V, 0. 45 Ω, 1 A hot-swap MOSFET
- Accurate 140 mA typ. inrush current level
- Programmable classification current
- Programmable DC current limit up to 1 A
- Integrated high-voltage startup bias regulator
- Thermal shutdown protection
- Current mode pulse width modulator
- Programmable oscillator frequency
- 80% maximum duty cycle with internal slope compensation
- Support for flyback, forward, forward active clamp, flyback with synchronous rectification
|
应用领域
- VoIP phones, WLAN AP
- WiMAX CPEs
- Security cameras
- PoE/PoE+ Powered Device appliances
功能框图
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PM8803 订购信息
| 订购型号 |
产品状态 |
美金价格 |
数量 |
封装 |
包装形式 |
温度范围 |
材料声明 |
| PM8803TR |
Active |
|
1000 |
HTSSOP20 |
Tape And Reel |
|
PM8803TR |
| PM8803 |
Active |
|
1000 |
HTSSOP20 |
Tube |
|
PM8803 |
DATASHEET
| 描述 |
版本 |
大小 |
| PM8803 : DS7139: High-efficiency, IEEE 802.3at compliant integrated PoE-PD interface and PWM controller |
1 |
817KB |
DATA BRIEF
APPLICATION NOTES
| 描述 |
版本 |
大小 |
| AN3387: PM8803 layout guidelines |
1 |
945KB |
| AN3373: IEEE802.3at compliant PD + PS design based on PM8803 low power, synchronous flyback PoE converter |
1 |
1256KB |
| AN4006: Designing a high-efficiency (60 W on 4 pairs) PoE converter using the PM8803 and an external current booster |
1 |
3187KB |
USER MANUALS
| 描述 |
版本 |
大小 |
| UM1062: EVALPM8803-FWD: IEEE802.3at compliant demonstration kit with synchronous active clamp forward converter |
1 |
1472KB |
| UM1063: EVALPM8803-FLY: IEEE802.3at compliant demonstration kit with synchronous active clamp forward converter |
1 |
1498KB |
BOARDS AND TOOLS
| 型号 |
描述 |
| EVALPM8803-FWD |
IEEE802.3at compliant demonstration kit with synchronous forward PoE converter |
| EVALPM8803-FLY |
IEEE802.3at compliant demonstration kit with synchronous flyback PoE converter |
FLYERS
| 描述 |
版本 |
大小 |
| FLPM88031010 : PM8803: Integrated PoE+ PD interface and PWM controller |
1.0 |
217KB |
