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| 型号： | MAX5942BESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC IEEE 802.3AF POE SYSTM 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 控制器类型： | 以太网供电控制器（POE） |
| 接口： | IEEE 802.3af |
| 电源电压： | 48V |
| 电流 - 电源： | 1mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
MAX5942A/MAX5942B
IEEE 802.3af Power-Over-Ethernet
Interface/PWM Controller for Power Devices
16
______________________________________________________________________________________
Current-Sense Comparator
The current-sense (CS) comparator and its associated
logic limit the peak current through the MOSFET.
Current is sensed at CS as a voltage across a sense
resistor between the source of the MOSFET and GND.
To reduce switching noise, connect CS to the external
MOSFET source through a 100 resistor or an RC low-
pass filter (Figures 5, 6). Select the current-sense resis-
tor, RSENSE according to the following equation:
where ILIMPrimary is the maximum peak primary-side
current.
When VCS > 465mV, the power MOSFET switches off.
The propagation delay from the time the switch current
reaches the trip level to the driver turn-off time is 180ns.
Internal Error Amplifier
The MAX5942A/MAX5942B include an internal error
amplifier that can be used to regulate the output volt-
age in the case of a nonisolated power supply (see
Figure 5). Calculate the output voltage using the follow-
ing equation:
where VREF = 2.4V.
Choose R1//R2 << RIN, where RIN 50k is the input
resistance of FB. The gain of the error amplifier is inter-
nally configured for -20 (see Figure 4).
The error amplifier may also be used to regulate the out-
put of the tertiary winding for implementing a primary-
side regulated isolated power supply (see Figure 7).
Calculate the output voltage using the following equation:
where NS is the number of secondary turns and NT is
the number of tertiary winding turns.
V
N
R
V
OUT
S
T
1
2
REF
=+
×
1
V
R
V
OUT
1
2
REF
=+
×
1
RI
SENSE
LIMPrimary
= 0 465
./
V
NDRV
VOUT
5V/10A
COUT
3
560F
CDD
4.7F
CCC
10F
CSS
0.1F
VDD
RCL
UVLO
RSENSE
100m
R1
2k
R2
2k
100
20
M1
IRF640N
VIN
(36V TO 72V)
NT
NR
NP
NS
CIN
VCC
CS
V-
3
0.47F
L1
4.7H
FB
GATE
OUT
PGOOD
MAX5942
V+
GND
GATE
1nF
6
CMHD2003
1N4148
14
SBL204OCT
(OPTIONAL)
CFB
SS_SHDN
14
5
VEE
25.5k
RCL
Figure 5. Forward Converter
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5943AEEE | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5943AEEE+ | 功能描述:热插拔功率分布 FireWire Current Limiter RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5943AEEE+T | 功能描述:热插拔功率分布 FireWire Current Limiter RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5943AEEE-T | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| MAX5943AEVKIT | 功能描述:电源管理IC开发工具 Evaluation Kit for the MAX5943A/B/C/D/E RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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