- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69008 > LTC4269IDKD-2 (LINEAR TECHNOLOGY CORP) SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 PDF資料下載
參數(shù)資料
| 型號： | LTC4269IDKD-2 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| 封裝： | 7 X 4 MM, PLASTIC, M0-229, DFN-32 |
| 文件頁數(shù)： | 7/34頁 |
| 文件大?。?/td> | 383K |
| 代理商： | LTC4269IDKD-2 |
第1頁第2頁第3頁第4頁第5頁第6頁當前第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁
LTC4269-2
42692fb
applicaTions inForMaTion
also ceases operation for classification and turns off the
internal Hot Swap FET. If this feature is not used, connect
SHDN to VPORTN.
CLASSIFICATION
Classification provides a method for more efficient power
allocation by allowing the PSE to identify a PD power clas-
sification. Class 0 is included in the IEEE specification for
PDs that don’t support classification. Class 1-3 partitions
PDs into three distinct power ranges. Class 4 includes the
new power range under IEEE 802.3at (see Table 2).
During classification probing, the PSE presents a fixed
voltage between 15.5V and 20.5V to the PD (Figure 1).
The LTC4269-2 asserts a load current representing the
PD power classification. The classification load current
is programmed with a resistor RCLASS that is chosen
from Table 2.
Table 2. Summary of Power Classifications and LTC4269-2
RCLASS Resistor Selection
CLASS USAGE
MAXIMUM
POWER LEVELS
AT INPUT OF PD
(W)
NOMINAL
CLASSIFICATION
LOAD CURRENT
(mA)
LTC4269-2
RCLASS
RESISTOR
(Ω, 1%)
0
Type 1
0.44 to 12.95
<0.4
Open
1
Type 1
0.44 to 3.84
10.5
124
2
Type 1
3.84 to 6.49
18.5
69.8
3
Type 1
6.49 to 12.95
28
45.3
4
Type 2
12.95 to 25.5
40
30.9
2-EVENT CLASSIFICATION AND THE T2P PIN
A Type 2 PSE may declare the availability of high power by
performing a 2-event classification (Layer 1) or by com-
municating over the high speed data line (Layer 2). A Type
2 PD must recognize both layers of communication. Since
VPORTP
VPORTN
SHDN
LTC4269-2
SIGNATURE DISABLE
42692 F03
25k SIGNATURE
RESISTOR
14k
TO
PSE
Figure 3. 25k Signature Resistor with Disable
Layer 2 communications takes place directly between the
PSE and the PD, the LTC4269-2 concerns itself only with
recognizing 2-event classification.
In 2-event classification, a Type 2 PSE probes for power
classification twice. Figure 4 presents an example of a
2-event classification. The 1st classification event occurs
DETECTION V1
ON
UVLO
ON
= RLOAD C1
TRACKS
VPORTN
DETECTION V2
TIME
PD
CURRENT
50
40
30
V PORTP
(V)
20
10
40mA
50
40
30
20
10
TIME
V PORTP
–
V
NEG
(V)
–10
TIME
–20
–30
V PORTP
–
T2P
(V)
–40
–50
dV
dt
INRUSH
C1
=
42692 F04
INRUSH = 100mA RCLASS = 30.9
ILOAD =
VPORTP
RLOAD
VPORTP
PSE
IIN
RLOAD
RCLASS
C1
RCLASS
T2P
LTC4269-2
VNEG
VPORTN
1ST CLASS
2ND MARK
DETECTION I1
DETECTION I2
2ND MARK
2ND CLASS
1ST CLASS
2ND CLASS
LOAD, ILOAD
INRUSH
1ST MARK
Figure 4. VNEG, T2P and PD Current as a
Result of 2-Event Classification
相關PDF資料 |
PDF描述 |
|---|---|
| LTC4269CDKD-2 | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| LTC4269IDKD-2#TR | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| LTC4412IS6#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| LTC4412IS6#TRM | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| LTC4558EUD#TR | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC20 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4269IDKD-2#PBF | 功能描述:IC PD/SYNC FORWARD CTRLR 32-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC4269IDKD-2#TRPBF | 功能描述:IC PD/SYNC FORWARD CTRLR 32-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內(nèi)部開關:是 電流限制:可調(diào) 電源電壓:9 V ~ 13.2 V 工作溫度:-40°C ~ 150°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN-EP（3x3） 包裝:管件 |
| LTC4269IDKD-2-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4269IDKD-2-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4269IDKD-2-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
發(fā)布緊急采購，3分鐘左右您將得到回復。