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参数资料
| 型号： | LTC4269CDKD-2#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDSO32 |
| 封装： | 7 X 4 MM, PLASTIC, M0-229, DFN-32 |
| 文件页数： | 7/34页 |
| 文件大小： | 383K |
| 代理商： | LTC4269CDKD-2#TR |
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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
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相关代理商/技术参数 |
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|---|---|
| LTC4269CDKD-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support |
| LTC4269IDKD-1#PBF | 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4269IDKD-1#TRPBF | 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4269IDKD-1-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller |
| LTC4269IDKD-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:IEEE 802.3at PD with Synchronous No-Opto Flyback Controller |
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