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參數(shù)資料
| 型號： | TPS23756PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.1 A SWITCHING CONTROLLER, 278 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 9/41頁 |
| 文件大?。?/td> | 1405K |
| 代理商： | TPS23756PWP |
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V
UVLO_R
Detection
Classification
PDPowered
Idle
V
CL_ON
V
CL_H
V
CU_OFF
V
CU_H
Note:VariablenamesrefertoElectricalCharacteristic
Tableparameters
V
DD-VSS
V
UVLO_H
Mark
V
MSR
F
u
n
c
ti
o
n
a
l
S
ta
te
TPS23754
TPS23754-1
TPS23756
www.ti.com
SLVS885D – OCTOBER 2008 – REVISED DECEMBER 2009
Table 2. Comparison of Operational Limits
POWER LOOP
PSE
PSE STATIC
PD INPUT
STATIC PD INPUT VOLTAGE
RESISTANCE
OUTPUT POWER
OUTPUT VOLTAGE
POWER
STANDARD
POWER
≤
POWER >
(max)
(min)
(max)
12.95 W
IEEE 802.3-2008
20
15.4 W
44 V
12.95 W
37 V–57 V
N/A
802.3at (Type 1)
802.3at (Type 2)
12.5
36 W
50 V
25.5 W
37 V–57 V
42.5 V–57 V
The PSE can apply voltage either between the RX and TX pairs (pins 1 - 2 and 3 - 6 for 10baseT or 100baseT),
or between the two spare pairs (4 - 5 and 7 - 8). Power application to the same pin combinations in 1000baseT
systems is recognized in IEEE 802.3at. 1000baseT systems can handle data on all pairs, eliminating the spare
pair terminology. The PSE may only apply voltage to one set of pairs at a time. The PD uses input diode bridges
to accept power from any of the possible PSE configurations. The voltage drops associated with the input
bridges create a difference between the standard limits at the PI and the TPS23754 specifications.
A compliant type 2 PD has power management requirements not present with a type 1 PD. These requirements
include the following:
1. Must interpret type 2 hardware classification
2. Must present hardware class 4
3. Must implement DLL negotiation
4. Must behave like a type 1 PD during inrush and startup
5. Must not draw more than 13W for 80ms after PSE applies operating voltage (power-up)
6. Must not draw more than 13W if it has not received a type 2 hardware classification or received permission
through DLL
7. Must meet various operating and transient templates
8. Optionally monitor for the presence or absence of an adapter (assume high power).
As a result of these requirements, the PD must be able to dynamically control its loading, and monitor T2P for
changes. In cases where the design needs to know specifically if an adapter is plugged in and operational, the
adapter should be individually monitored, typically with an optocoupler.
Threshold Voltages
The TPS23754 has a number of internal comparators with hysteresis for stable switching between the various
states. Figure 22 relates the parameters in the Electrical Characteristics section to the PoE states. The mode
labeled idle between classification and operation implies that the DEN, CLS, and RTN pins are all high
impedance. The state labeled Mark, which is drawn in dashed lines, is part of the new type 2 hardware class
state machine.
Figure 22. Threshold Voltages
Copyright 2008–2009, Texas Instruments Incorporated
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS23756PWPR | 功能描述:熱插拔功率分布 Hi Pwr Eff PoE Inter face & DC/DC Cntrlr 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 |
| TPS23757EVM | 功能描述:電源管理IC開發(fā)工具 TPS23757 Eval Mod 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 |
| TPS23757PW | 功能描述:熱插拔功率分布 Hi Eff PoE Inter & DC/DC 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS23757PWR | 功能描述:熱插拔功率分布 Hi Eff PoE Interface & DC/DC 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| TPS2375D | 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: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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