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| 型號： | TPS2376DDAR-H |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | GREEN, PLASTIC, POWER PAD, SOIC-8 |
| 文件頁數(shù)： | 20/23頁 |
| 文件大?。?/td> | 640K |
| 代理商： | TPS2376DDAR-H |
www.ti.com
SLVS646A – SEPTEMBER 2006 – REVISED SEPTEMBER 2006
Table 1. CLASSIFICATION - IEEE 802.3af values
CLASS
PD POWER (W)
R(CLASS) ()
802.3af LIMITS (mA)
NOTE
0
0.44 – 12.95
4420
±1%
0 - 4
Default class
1
0.44 – 3.84
953
±1%
9 - 12
2
3.84 – 6.49
549
±1%
17 - 20
3
6.49 – 12.95
357
±1%
26 - 30
4
-
255
±1%
36 - 44
Reserved for future use
DET: R(DET) should be connected between VDD and the DET pin when it is used. R(DET) is connected across the
input line when V(VDD) lies between 1.4 V and 11.3 V, and is disconnected when the line voltage exceeds this
range to conserve power.
The parallel combination of R(DET) and the UVLO program resistors must equal 24.9 k, ±1%. Minimizing R(DET),
and maximizing the UVLO program resistors, improves efficiency during normal operation. Conversely, R(DET)
may be eliminated with the UVLO divider providing the 24.9 k
signature to reduce component count.
VSS: This is the input supply negative rail that serves as a local ground. The PowerPad must be connected to
this pin.
RTN: This pin provides the switched negative power rail used by the downstream circuits. The operational and
inrush current limit control current into the pin. The PG circuit monitors the RTN voltage and also uses it as the
return for the PG pin pulldown transistor. The internal MOSFET body diode clamps VSS to RTN when voltage is
present between VDD and RTN and the Power-over-Ethernet (PoE) input is not present.
PG: This pin goes to a high resistance state when the internal MOSFET that feeds the RTN pin is enabled, and
the device is not in inrush current limiting. In all other states except detection, the PG output is pulled to RTN by
the internal open-drain transistor. Performance is ensured with at least 4 V between VDD and RTN.
PG is an open-drain output, which may require a pullup resistor or other interface to the dc/dc converter. PG
may be left open if not used.
UVLO: The UVLO pin is used with an external resistor divider between VDD and VSS to set the upper and
lower UVLO thresholds. The TPS2376-H enables the output when V(UVLO) exceeds the upper UVLO threshold,
and turns it off when the input falls below the lower threshold.
The UVLO divider resistance may be used alone to provide the 24.9 k
detection signature, or be used in
conjunction with R(DET). Eliminating R(DET) reduces the component count at the cost of lower operating efficiency.
VDD: This is the positive input supply that is also common to downstream load circuits. This pin provides
operating power and allows the controller to monitor the line voltage to determine the mode of operation.
6
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| TPS2376DDAR-HG4 | 功能描述:熱插拔功率分布 IEEE 802.3af PoE Hi Pwr PD CONTROLLER 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 |
| TPS2376DG4 | 功能描述:熱插拔功率分布 IEEE 802.3af PoE Pwr Device Cntrler 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 |
| TPS2376DR | 功能描述:熱插拔功率分布 IEEE 802.3af PoE Pwr Device Cntrler 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 |
| TPS2376DRG4 | 功能描述:熱插拔功率分布 IEEE 802.3af PoE Pwr Device Cntrler 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 |
| TPS2376HEVM | 功能描述:電源管理IC開發(fā)工具 TPS2376H Evaluation Module 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 |
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