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參數(shù)資料
| 型號： | LM5071MT-50 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Power Over Ethernet PD Controller with Auxiliary Power Power Over Ethernet PD Controller with Auxiliary Power |
| 中文描述： | SWITCHING CONTROLLER, 665 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大小： | 857K |
| 代理商： | LM5071MT-50 |
Gate Driver and Maximum Duty
Cycle Limit
(Continued)
plished with an internal toggle flip-flop which ensures an
accurate duty cycle limit. The internal oscillator frequency of
the LM5071-50 is therefore twice the operating frequency of
the PWM controller (OUT pin).
The 80% maximum duty cycle limit of the LM5071-80 is
determined by the internal oscillator and varies more than
the 50% limit of the LM5071-50. For the LM5071-80, the
internal oscillator frequency and the operational frequency of
the PWM controller are equal.
Thermal Protection
Internal thermal shutdown circuitry is provided to protect the
integrated circuit in the event the maximum junction tem-
perature is exceeded. This feature prevents catastrophic
failures from accidental device overheating. When activated,
typically at 165 degrees Celsius, the controller is forced into
a low power standby state, disabling the output driver, bias
regulator, main interface pass MOSFET, and classification
regulator if enabled.After the temperature is reduced (typical
hysteresis = 25C ) the V
CC
regulator will be enabled and a
softstart sequence initiated.
Thermal shutdown is not enabled during auxiliary power
operation as the power MOSFET is not running any current
and should not experience an over-temperature condition. If
the drain of the MOSFET exceeds 2.5V with respect to VEE
(internal Power Good de-assertion), PoE UVLO becomes
de-asserted (insertion of PoE or other 48V supply), or the
auxiliary power is removed, thermal limit will be re-enabled
immediately.
L
www.national.com
14
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| LM50C | CABLE |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM5071MT-50/NOPB | 功能描述:熱插拔功率分布 80V Poe Combo Device RoHS:否 制造商:Texas Instruments 產品: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 |
| LM5071MT-50-NOPB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM5071 Power Over Ethernet PD Controller with Auxiliary Power Interface |
| LM5071MT-80 | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產品: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 |
| LM5071MT-80/NOPB | 功能描述:熱插拔功率分布 80V Poe Combo Device RoHS:否 制造商:Texas Instruments 產品: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 |
| LM5071MT-80/NOPB | 制造商:Texas Instruments 功能描述:, Input Voltage Primary Max:60V, Control |
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