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參數(shù)資料
| 型號(hào)： | LM5070MTC-50 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Integrated Power Over Ethernet PD Interface and PWM Controller |
| 中文描述： | 0.8 A SWITCHING CONTROLLER, 665 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁(yè)數(shù)： | 10/17頁(yè) |
| 文件大?。?/td> | 833K |
| 代理商： | LM5070MTC-50 |
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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(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM5070MTC-50/NOPB | 功能描述:熱插拔功率分布 Combo Poe PD Device 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| LM5070MTC-80 | 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| LM5070MTC-80/NOPB | 功能描述:熱插拔功率分布 Combo Poe PD Device 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| LM5070MTC-80/NOPB | 制造商:Texas Instruments 功能描述:, Input Voltage Primary Max:75V, Control |
| LM5070MTCX-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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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