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参数资料
| 型号： | LTC4259CGW#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36 |
| 封装： | 0.300 INCH, PLASTIC, SSOP-36 |
| 文件页数： | 20/32页 |
| 文件大小： | 324K |
| 代理商： | LTC4259CGW#PBF |
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LTC4259
27
4259i
does not implement these older detection methods auto-
matically, if software or external circuitry can detect the
noncompliant devices, the host controller may command
the LTC4259 to power the port, bypassing IEEE compliant
detection and classification and sending power to the
noncompliant device.
LOGIC LEVEL SUPPLY
Aside from the 48V used to source power down Ethernet
cables connected to each port, a logic level supply is
required to power the digital portion of the LTC4259. To
simplify design and meet voltage isolation requirements,
the logic level supply can be generated from the isolated
– 48V supply. Figure 19 shows an example method using
an LT
1619 to control a –48V to 3.3V current mode
supply. This boost converter topology uses the LT1619
current mode controller and a current mirror which
reflects the 3.3V output voltage to the –48V rail, improv-
ing the regulation tolerance over the more traditional
large resistor voltage divider. This approach achieves
high accuracy with a transformerless design yielding
high performance (tight regulation).
IEEE 802.3af COMPLIANCE
The LTC4259 is designed to control power delivery in IEEE
802.3af compliant Power Sourcing Equipment (PSE).
Because proper operation of the LTC4259 may depend on
external signals and power sources, like the –48V supply
(VEE) or the OSCIN oscillator source, external components
such as the sense resistors (RS), and possibly software
running on an external microprocessor, using the LTC4259
in a PSE does not guarantee 802.3af compliance. Using an
LTC4259 does get you most of the way there. This section
discusses the rest of the elements that go along with the
LTC4259 to make an 802.3af complaint PSE. Each para-
graph below addresses a component which is critical for
PSE compliance as well as possible pitfalls that can cause
a PSE to be noncompliant. For further assistance please
contact Linear Technology’s Applications department.
APPLICATIO S I FOR ATIO
WU
UU
DRV
R37
100
L4
100
H
L3
4.7
H
D16
B1100
C11
10
F
16V
C7
4700pF
C8
100pF
D17
CMPZ4702B
ISOLATED
GND
ISOLATED
–48V
Q8
Si2328DS
Q5
FMMT593
Q6
FMMT593
87
6
5
2
3
4
1
GATE
VIN
VC
S/S
SENSE
LT1619
FB
GND
Q7
Si2328DS
R38
510
R32
47k
R36
3.32k
1%
R33
0.100
1%
1W
R34
1.24k
1%
R35
100k
4259 F19
R39
910k
C12
2.2
F
100V
+
VEE
C9
47
F
10V
VDD
3.3V
300mA
+
C10
47
F
10V
ISOLATED
GND
+
Figure 19. –48V to 3.3V Boost Converter
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PDF描述 |
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| LTC4259CGW | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4260 | 制造商:LINER 制造商全称:Linear Technology 功能描述:UV, OV and Reverse Supply Protection Controller Low Operating Current: 125μA |
| LTC4260CGN | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 24-Pin SSOP N |
| LTC4260CGN#PBF | 功能描述:IC CTLR HOT SWAP I2C 24-SSOP 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) |
| LTC4260CGN#TR | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 24-Pin SSOP N T/R |
| LTC4260CGN#TRPBF | 功能描述:IC HOT SWAP CNTRL I2C 24-SSOP 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) |
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