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參數資料
| 型號： | LTC4263CDE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Single IEEE 802.3af Compliant PSE Controller with Internal Switch; Package: DFN; No of Pins: 14; Temperature Range: 0°C to +70°C |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDSO14 |
| 封裝： | 4 X 3 MM, LEAD FREE, PLASTIC, MO-229WGED-3, DFN-14 |
| 文件頁數： | 9/24頁 |
| 文件大?。?/td> | 349K |
| 代理商： | LTC4263CDE#PBF |
LTC4263
17
4263fe
APPLICATIONS INFORMATION
When active, the LED ash codes are repeated every 1.2
seconds. The duration of each LED ash is 75ms. Multiple
LED ashes occur at a 300ms interval.
The LTC4263 includes a feature for efciently driving the
LED from a 48V power supply without the wasted power
caused by having to drop over 45V in a current limit
resistor. When operating the VDD5 supply internally, the
LTC4263 drives the LED pin with a 6% duty cycle PWM
signal. This allows use of the simple LED drive circuit in
Figure 9 to minimize power dissipation. The modulation
frequency of the LED drive is 28kHz, making the on period
2.2μs. During the 2.2μs that the LED pin is pulled low, cur-
rent ramps up in the inductor, limited by RLED. Diode D2
completes the circuit by allowing current to circulate while
the LED pin is open circuit. Since current is only drawn
from the power supply 6% of the time, power dissipation
is substantially reduced.
When VDD5 is powered from an external supply, the PWM
signal is disabled and the LED pin will pull down continu-
ously when on. In this mode, the LED can be powered from
the 5V supply with a simple series resistor.
IEEE 802.3af COMPLIANCE AND EXTERNAL
COMPONENT SELECTION
This section discusses the other elements that go along
with the LTC4263 to make an IEEE 802.3af compliant PSE.
The LTC4263 is designed to control power delivery in IEEE
802.3af compliant Power Sourcing Equipment. Because
proper operation of the LTC4263 also depends on external
components and power sources like the 48V supply, using
the LTC4263 in a PSE does not in itself guarantee IEEE
802.3af compliance. To ensure a compliant PSE design,
it is recommended to adhere closely to the example ap-
plication circuits provided. For further assistance contact
the Linear Technology Applications department.
Figure 9. LED Drive Circuit with Single 48V Supply
Table 3. Port Status and LED Flash Codes
PORT STATUS
LED FLASH CODE
FLASH PATTERN
Non-Powered Device
0Ω < RPORT < 200Ω
Off
LED Off
Port Open
RPORT > 1MΩ
Off
LED Off
Port On
25kΩ
On
LED On
Low Signature Resistance
300Ω < RPORT < 15kΩ
1 Flash
High Signature Resistance
33kΩ < RPORT < 500kΩ
2 Flashes
Port Overload Fault
5 Flashes
Power Management
Allocation Exceeded
9 Flashes
VDD48
D1
10mH, 21mA
COILCRAFT
DS1608C-106
D2
BAS19
VDD5
RLED
1k
VDD48
LED
VSS
LTC4263
4263 F09
0.1μF
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC4263CDE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single IEEE 802.3af Compliant PSE Controller with Internal Switch |
| LTC4263CS | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single IEEE 802.3af Compliant PSE Controller with Internal Switch |
| LTC4263CS#PBF | 功能描述:IC IEEE 803.2AF CNTRLR 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用:通用型，PCI Express? 內部開關:無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4263CS#TRPBF | 功能描述:IC IEEE 803.2AF CNTRLR 14-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:100 系列:- 類型:熱插拔開關 應用:通用 內部開關:是 電流限制:可調 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 |
| LTC4263CS-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Single IEEE 802.3af Compliant PSE Controller with Internal Switch |
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