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| 型號(hào)： | MAX5942BESE+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 13/24頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC IEEE 802.3AF POE SYSTM 16SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 控制器類(lèi)型： | 以太網(wǎng)供電控制器（POE） |
| 接口： | IEEE 802.3af |
| 電源電壓： | 48V |
| 電流 - 電源： | 1mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 管件 |
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MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
20
______________________________________________________________________________________
COMPONENT
SUPPLIERS
WEBSITE
International Rectifier
www.irf.com
Fairchild
www.fairchildsemi.com
Power FETS
Vishay-Siliconix
www.vishay.com/brands/siliconix/main.html
Dale-Vishay
www.vishay.com/brands/dale/main.html
Current-Sense Resistors
IRC
www.irctt.com/pages/index.cfm
ON Semi
www.onsemi.com
General Semiconductor
www.gensemi.com
Diodes
Central Semiconductor
www.centralsemi.com
Sanyo
www.sanyo.com
Taiyo Yuden
www.t-yuden.com
Capacitors
AVX
www.avxcorp.com
Coiltronics
www.cooperet.com
Coilcraft
www.coilcraft.com
Magnetics
Pulse Engineering
www.pulseeng.com
Table 3. Component Suppliers
6) Choose RSENSE according to the following equation:
where:
VILIM is the current-sense comparator trip threshold
voltage (0.465V).
NS/NP is the secondary-side turns ratio (5/14 in this
example).
IOUTMAX is the maximum DC output current (10A in
this example):
7) Choose the inductor value so that the peak ripple
current (LIR) in the inductor is between 10% and
20% of the maximum output current:
where VD is the output Schottky diode forward-volt-
age drop (0.5V) and LIR is the ratio of inductor rip-
ple current to DC output current:
8) The size and ESR of the output filter capacitor deter-
mine the output ripple. Choose a capacitor with a
low ESR to yield the required ripple voltage.
Use the following equations to calculate the peak-to-
peak output ripple:
where:
VRIPPLE is the combined RMS output ripple due to
VRIPPLE,ESR, the ESR ripple, and VRIPPLE,C, the
capacitive ripple. Calculate the ESR ripple and
capacitive ripple as follows:
VRIPPLE,ESR = IRIPPLE x ESR
VRIPPLE,C = IRIPPLE/(2 x π x 275kHz x COUT)
Layout Recommendations
All connections carrying pulsed currents must be very
short, be as wide as possible, and have a ground plane
as a return path. The inductance of these connections
must be kept to a minimum due to the high di/dt of the
currents in high-frequency switching power converters.
Current loops must be analyzed in any layout pro-
posed, and the internal area kept to a minimum to
reduce radiated EMI. Ground planes must be kept as
intact as possible.
VV
V
RIPPLE
RIPPLE ESR
RIPPLE C
=+
,,
22
L
-
≥
()× ()
××
=
5 5
1 0 198
0 4 275
10
401
..
.
kHz
A
H
L
V-
OUT
≥
+
()× ()
××
×
VD
LIR
kHz I
DMIN
OUTMAX
1
2
275
RSENSE ≤
××
=
0 465
6
14
12 10
90 4
.
V
m
R
V
N
SENSE
ILIM
S
P
≤
××
12
.IOUTMAX
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| MAX5942BESE+ | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af POE Int/PWM Controller RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX5942BESE+T | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af POE Int/PWM Controller RoHS:否 制造商:Silicon Labs 產(chǎn)品: 輸入/輸出端數(shù)量: 工作電源電壓: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX5942BESE-T | 功能描述:電源開(kāi)關(guān) IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開(kāi)關(guān)數(shù)量:Single 開(kāi)關(guān)配置:SPST 開(kāi)啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開(kāi)啟時(shí)間（最大值）:13 ns 關(guān)閉時(shí)間（最大值）:20 ns 切換電壓（最大）: 工作電源電壓:8 V to 26 V 最大工作溫度:+ 125 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:TO-220F-6 |
| MAX5943AEEE | 功能描述:熱插拔功率分布 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5943AEEE+ | 功能描述:熱插拔功率分布 FireWire Current Limiter 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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