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参数资料
| 型号： | MAX5965AUAX+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 18/54页 |
| 文件大小： | 1334K |
| 描述： | IC PSE CTRLR FOR POE 36SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | 以太网供电控制器（PoE） |
| 应用： | IP 电话，LAN 网络供电，网络路由器和交换机 |
| 内部开关： | 无 |
| 电源电压： | 2.4 V ~ 3.6 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BSOP（0.295"，7.50mm 宽） |
| 供应商设备封装： | 36-SSOP |
| 包装： | 带卷 (TR) |
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High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
18 ______________________________________________________________________________________
A valid PD has a 25k& discovery signature characteristic
as specified in the IEEE 802.3af/at standard. Table 1
shows the IEEE 802.3af/at specification for a PSE detect-
ing a valid PD signature. See the Typical Operating
Circuits and Figure 1a (Detection, Classification, and
Power-Up Port Sequence). The MAX5965A/MAX5965B
can probe and categorize different types of devices con-
nected to the port such as: a valid PD, an open circuit, a
low resistive load, a high resistive load, a high capacitive
load, a positive DC supply, or a negative DC supply.
During detection, the MAX5965A/MAX5965B keep the
external MOSFET off and force two probe voltages
through the DET_ input. The current through the DET_
input is measured as well as the voltage at OUT_. A
two-point slope measurement is used as specified by
the IEEE 802.3af standard to verify the device connect-
ed to the port. The MAX5965A/MAX5965B implement
appropriate settling times and a 100ms digital integra-
tion to reject 50Hz/60Hz power-line noise coupling.
An external diode, in series with the DET_ input, restricts
PD detection to the first quadrant as specified by the
IEEE 802.3af/at standard. To prevent damage to non-PD
devices, and to protect themselves from an output short
circuit, the MAX5965A/MAX5965B limit the current into
DET_ to less than 2mA maximum during PD detection.
In midspan mode, the MAX5965A/MAX5965B wait 2.2s
before attempting another detection cycle after every
failed detection. The first detection, however, happens
immediately after issuing the detection command.
High-Capacitance Detection
The CLC_EN bit in register R23h[5] enables the large
capacitor detection feature for legacy PD devices.
When CLC_EN = 1, the high-capacitance detection limit
is extended up to 150礔. CLC_EN = 0 is the default
condition for the normal capacitor size detection. See
Table 1 and the Register Map and Description section.
Table 1. PSE PI Detection Modes Electrical Requirement
(Table 33-2 of the IEEE 802.3af Standard)
PARAMETER
SYMBOL
MIN
MAX
UNITS
ADDITIONAL INFORMATION
Open-Circuit Voltage
V
OC
30
V
In detection mode only
Short-Circuit Current
I
SC
5
mA
In detection mode only
Valid Test Voltage
V
VALID
2.8
10
V
Voltage Difference
Between Test Points
V
TEST
1
V
Time Between Any Two
Test Points
t
BP
2
ms
This timing implies a 500Hz maximum probing
frequency
Slew Rate
V
SLEW
0.1
V/祍
Accept Signature
Resistance
R
GOOD
19
26.5
k&
Reject Signature
Resistance
R
BAD
< 15
> 33
k&
Open-Circuit Resistance
R
OPEN
500
k&
Accept Signature
Capacitance
C
GOOD
150
nF
Reject Signature
Capacitance
C
BAD
10
礔
Signature Offset Voltage
Tolerance
V
OS
0
2.0
V
Signature Offset Current
Tolerance
I
OS
0
12
礎
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相关代理商/技术参数 |
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|---|---|
| MAX5965BCAX+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5965BCAX+T | 制造商:Maxim Integrated Products 功能描述:HIGH-POWER, QUAD, MONOLITHIC, PSE CONTROLLERS FOR POWER OVER - Tape and Reel |
| MAX5965BEAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5965BEAX+T | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
| MAX5965BUAX+ | 功能描述:热插拔功率分布 Quad PSE Controller for POE 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 |
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