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參數(shù)資料
| 型號(hào)： | MAX5941B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| 中文描述： | 符合IEEE 802.3af標(biāo)準(zhǔn)的以太網(wǎng)供電接口/PWM控制器，適用于用電設(shè)備 |
| 文件頁數(shù)： | 17/24頁 |
| 文件大?。?/td> | 453K |
| 代理商： | MAX5941B |
M
IEEE 802.3af-Compliant Power-Over-Ethernet
Interface/PWM Controller for Power Devices
______________________________________________________________________________________
17
PWM Comparator and Slope Compensation
An internal 275kHz oscillator determines the switching
frequency of the controller. At the beginning of each
cycle, NDRV switches the N-channel MOSFET on.
NDRV switches the external MOSFET off after the maxi-
mum duty cycle has been reached, regardless of the
feedback.
The MAX5941B uses an internal ramp generator for
slope compensation. The internal ramp signal is reset
at the beginning of each cycle and slews at 26mV/μs.
The PWM comparator uses the instantaneous current,
the error voltage, the internal reference, and the slope
compensation (MAX5941A only) to determine when to
switch the N-channel MOSFET off. In normal operation,
the N-channel MOSFET turns off when:
where I
PRIMARY
is the current through the N-channel
MOSFET, V
REF
is the 2.4V internal reference, and
V
SCOMP
is a ramp function starting at zero and slewing
at 26mV/μs (MAX5941A only). When using the
MAX5941A in a forward-converter configuration, the fol-
lowing condition must be met to avoid control-loop sub-
harmonic oscillations:
I
R
V
-V
-V
PRIMARY
SENSE
OPTO
REF
SCOMP
×
>
MAX5941A
V
DD
V+
GND
NDRV
CS
V-
OUT
V
CC
OPTO
V
IN
V
OUT
OPTOCOUPLER
C
DD
C
CC
100
R
SENSE
R
1
R
2
C
OUT
C
IN
N
T
N
P
N
S
M1
4.7nF
250VAC
TLV431
220
UVLO
RCL
GATE
SS_SHDN
PGOOD
PGOOD
V
EE
C
SS
R
DISC
25.5k
R
CL
Figure 6. Flyback Converter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5941A | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| MAX5941 | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| MAX5941ACSE | ECONOLINE: RBM - New Micro Size SIP 6 Package- Industry Standard Pinout- 3kVDC Isolation- UL94V-0 Package Material- Efficiency to 85% |
| MAX5941A-MAX5941B | Octal D-Type Transparent Latches with 3-state Outputs 20-LCCC -55 to 125 |
| MAX5941AESE | Octal D-Type Transparent Latches with 3-state Outputs 20-CDIP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5941BCSE | 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 |
| MAX5941BCSE+ | 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 |
| MAX5941BCSE+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 |
| MAX5941BCSE-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 |
| MAX5941BESE | 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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