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參數(shù)資料
| 型號： | MAX5942B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | IEEE 802.3af Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| 中文描述： | IEEE 802.3af以太網(wǎng)供電接口/PWM控制器，適用于用電設備 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大小： | 465K |
| 代理商： | MAX5942B |
M
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
20
______________________________________________________________________________________
COMPONENT
SUPPLIERS
WEBSITE
International Rectifier
Fairchild
Vishay-Siliconix
Dale-Vishay
IRC
ON Semi
General Semiconductor
Central Semiconductor
Sanyo
Taiyo Yuden
AVX
Coiltronics
Coilcraft
Pulse Engineering
www.irf.com
www.fairchildsemi.com
www.vishay.com/brands/siliconix/main.html
www.vishay.com/brands/dale/main.html
www.irctt.com/pages/index.cfm
www.onsemi.com
www.gensemi.com
www.centralsemi.com
www.sanyo.com
www.t-yuden.com
www.avxcorp.com
www.cooperet.com
www.coilcraft.com
www.pulseeng.com
Power FETS
Current-Sense Resistors
Diodes
Capacitors
Magnetics
Table 3. Component Suppliers
6) Choose R
SENSE
according to the following equation:
where:
V
ILIM
is the current-sense comparator trip threshold
voltage (0.465V).
N
S
/N
P
is the secondary-side turns ratio (5/14 in this
example).
I
OUTMAX
is the maximum DC output current (10A in
this example):
0 465
6
14
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 V
D
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:
V
RIPPLE
is the combined RMS output ripple due to
V
RIPPLE,ESR
, the ESR ripple, and V
RIPPLE,C
, the
capacitive ripple. Calculate the ESR ripple and
capacitive ripple as follows:
V
RIPPLE,ESR
= I
RIPPLE
x ESR
V
RIPPLE,C
= I
RIPPLE
/(2 x
π
x 275kHz x C
OUT
)
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.
V
V
V
RIPPLE
RIPPLEESR
RIPPLEC
=
+
,
,
2
2
L
-
≥
(
.
)
×
(
)
×
=
μ
5 5
.
1 0 198
.
kHz
0 4 275
10
4 01
.
A
H
L
V
LIR
-
OUT
≥
+
275
(
)
×
(
kHz I
)
×
×
V
D
D
MIN
OUTMAX
1
2
R
SENSE
≤
×
=
1 2 10
.
90 4
.
.
V
m
R
V
N
N
SENSE
ILIM
×
S
P
≤
×
1 2
I
OUTMAX
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5942BCSE | 功能描述:電源開關 IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關數(shù)量:Single 開關配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關閉時間（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 安裝風格:Through Hole 封裝 / 箱體:TO-220F-6 |
| MAX5942BCSE+ | 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX5942BCSE+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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-64 封裝:Tray |
| MAX5942BCSE-T | 功能描述:電源開關 IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關數(shù)量:Single 開關配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關閉時間（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 安裝風格:Through Hole 封裝 / 箱體:TO-220F-6 |
| MAX5942BESE | 功能描述:電源開關 IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關數(shù)量:Single 開關配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時間（最大值）:13 ns 關閉時間（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 安裝風格:Through Hole 封裝 / 箱體:TO-220F-6 |
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