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| 型号： | MAX5965BEAX+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | High-Power, Quad, Monolithic, PSE Controllers for Power over Ethernet; Package: SSOP;36 pin;163 mm² ; Temperature: -40°C to +85°C |
| 中文描述： | 4-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO36 |
| 封装： | ROHS COMPLIANT, SSOP-36 |
| 文件页数： | 10/54页 |
| 文件大小： | 1525K |
| 代理商： | MAX5965BEAX+ |
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MAX5965A/MAX5965B
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 150F. 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
VOC
—
30
V
In detection mode only
Short-Circuit Current
ISC
—
5
mA
In detection mode only
Valid Test Voltage
VVALID
2.8
10
V
Voltage Difference
Between Test Points
VTEST
1—
V
Time Between Any Two
Test Points
tBP
2—
ms
This timing implies a 500Hz maximum probing
frequency
Slew Rate
VSLEW
0.1
V/s
Accept Signature
Resistance
RGOOD
19
26.5
k
Reject Signature
Resistance
RBAD
< 15
> 33
k
Open-Circuit Resistance
ROPEN
500
—
k
Accept Signature
Capacitance
CGOOD
—
150
nF
Reject Signature
Capacitance
CBAD
10
—
F
Signature Offset Voltage
Tolerance
VOS
0
2.0
V
Signature Offset Current
Tolerance
IOS
012
A
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| 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 |
| MAX5965BUAX+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 |
| MAX5967BETG+ | 功能描述:热插拔功率分布 I2C Hot Swap Controller 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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