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參數(shù)資料
| 型號： | LM5070 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Integrated Power Over Ethernet PD Interface and PWM Controller |
| 中文描述： | 集成以太網(wǎng)供電PD接口和PWM控制器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大小： | 833K |
| 代理商： | LM5070 |
Detailed Operating Description
The LM5070 power interface port and pulse width modula-
tion (PWM) controller provides a complete integrated solu-
tion for Powered Devices (PD) that connect into Power over
Ethernet (PoE) systems. Major features of the PD interface
portion of the IC include detection, classification, program-
mable inrush current limit, thermal limit, programmable und-
ervoltage lockout, and current limit monitoring. The device
also includes a high-voltage start-up bias regulator that op-
erates over a wide input range up to 75V. The switch mode
power supply (SMPS) control portion of the IC includes
power good sensing, V
regulator under-voltage lockout,
cycle-by-cycle current limit, error amplifier, slope compensa-
tion, softstart, and oscillator sync capability. This high speed
BiCMOS IC has total propagation delays less than 100ns
and a 1MHz capable oscillator programmed by a single
external resistor. The LM5070 PWM controller provides
current-mode control for dc-dc converter topologies requiring
a single drive output, such as Flyback and Forward topolo-
gies. The LM5070 PWM enables all of the advantages of
current-mode control including line feed-forward, cycle-by-
cycle current limit and simplified loop compensation. The
oscillator ramp is internally buffered and added to the PWM
comparator input ramp to provide slope compensation nec-
essary for current mode control at duty cycles greater than
50% (-80 suffix only).
Modes of Operation
The LM5070 PD interface is designed to provide a fully
compliant IEEE 802.3af system. As such, the modes of
operation take into account the barrel rectifiers often utilized
to correctly polarize the dc input from the Ethernet cable.
Table 1 shows the LM5070 operating modes and associated
input voltage range.
20120005
FIGURE 3. PWM Controller Block Diagram
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM5070AE EVAL | 功能描述:BOARD EVALUATION LM5070AE RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM5070AEEVAL | 功能描述:電源管理IC開發(fā)工具 LM5070 EVAL BOARD-MAINSTREAM RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM5070HE EVAL | 功能描述:BOARD EVALUATION LM5070HE RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM5070HEEVAL | 功能描述:電源管理IC開發(fā)工具 LM5070 EVAL BOARD FULL FEATURE RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM5070MTC-50 | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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