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參數(shù)資料
| 型號(hào)： | MAX5942AESE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 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： | 2,500 |
| 控制器類型： | 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： | 帶卷 (TR) |
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
______________________________________________________________________________________
19
VOUT = Output voltage (5V).
VD1 = Voltage drop across D1 (typically 0.5V for
power Schottky diodes).
DMAX = Minimum value of maximum operating duty
cycle (44%).
VIN_MIN = Minimum input voltage (30V).
In this example:
Choose NP based on core losses and DC resis-
tance. Use the turns ratio to calculate NS, rounding
up to the nearest integer. In this example, NP = 14
and NS = 6.
For a forward converter, choose a transformer with a
magnetizing inductance in the neighborhood of
200H. Energy stored in the magnetizing inductance
of a forward converter is not delivered to the load
and must be returned back to the input; this is
accomplished with the reset winding.
The transformer primary to secondary leakage
inductance should be less than 1H. Note that all
leakage energy is dissipated across the MOSFET.
Snubber circuits may be used to direct some or all
of the leakage energy to be dissipated across a
resistor.
To calculate the minimum duty cycle (DMIN), use the
following equation:
=
where VIN_MAX is the maximum input voltage (67V).
4) The reset winding turns ratio (NR/NP) needs to be
low enough to guarantee that the entire energy in
the transformer is returned to V+ within the off cycle
at the maximum duty cycle. Use the following equa-
tion to determine the reset winding turns ratio:
where:
NR/NP = Reset winding turns ratio.
DMAX’ = Maximum value of maximum duty cycle:
Round NR to the nearest smallest integer.
The turns ratio of the reset winding (NR/NP) determines
the peak voltage across the N-channel MOSFET.
Use the following equation to determine the maxi-
mum drain-source voltage across the N-channel
MOSFET:
VDSMAX = Maximum MOSFET drain-source voltage.
VIN_MAX = Maximum input voltage:
Choose MOSFETs with appropriate avalanche
power ratings to absorb any leakage energy.
5) Choose the tertiary winding turns ratio (NT/NP) so that
the minimum input voltage provides the minimum
operating voltage at VDD (13V). Use the following
equation to calculate the tertiary winding turns ratio:
where:
VDDMIN is the minimum VDD supply voltage (13V).
VDDMAX is the maximum VDD supply voltage (30V).
VIN_MIN is the minimum input supply voltage (30V).
VIN_MAX is the maximum input supply voltage (67V
in this design example).
NP is the number of turns of the primary winding.
NT is the number of turns of the tertiary winding:
Choose NT = 7.
13 7
4
36 7
14
639
7 67
..
30
1N
67
N
T
×
≤≤
×
≤≤
V
NN
V
N
DDMIN
IN_MIN
PT
DDMAX
IN_MAX
P
+
×
≤≤
+
×
07
.
V1 +
14
DSMAX ≥
×
=
67
134
VV
1 +
N
DSMAX
IN_MAX
P
R
≥
×
N1
1- 0.5
0.5
R ≤
×=
414
NN
1-D
D
RP
MAX
≤
×
′
D
V
N
-V
MIN
OUT
IN_MAX
S
P
D1
=
×
N
5V + 0.5V 0.44
S
P
≥
×
()
×
=
044 30
0 395
.
V
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參數(shù)描述 |
|---|---|
| MAX5942BCSE | 功能描述:電源開關(guān) IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關(guān)數(shù)量:Single 開關(guān)配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時(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 |
| 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(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 |
| 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(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 |
| MAX5942BCSE-T | 功能描述:電源開關(guān) IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關(guān)數(shù)量:Single 開關(guān)配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時(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 |
| MAX5942BESE | 功能描述:電源開關(guān) IC - POE / LAN RoHS:否 制造商:Fairchild Semiconductor 開關(guān)數(shù)量:Single 開關(guān)配置:SPST 開啟電阻（最大值）:7.3 Ohms 串話: 帶寬: 開啟時(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 |
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