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參數(shù)資料
| 型號： | MAX5945 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quad Network Power Controller for Power-Over-LAN |
| 中文描述： | 四路網(wǎng)絡(luò)電源控制器，用于LAN供電 |
| 文件頁數(shù)： | 15/44頁 |
| 文件大小： | 572K |
| 代理商： | MAX5945 |
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Table 2 shows the IEEE 802.3af requirement for a PSE
classifying a PD at the power interface (PI).
Powered State
When the part enters PWR MODE, the t
START
and t
DISC
timers are reset. Before turning on the power, the part
checks if any other port is not turning on and if the
t
FAULT
timer is zero. Another check is performed if the
ACD_EN bit is set, in this case OSC_FAIL bit must be
low (oscillator is okay) for the port to be powered.
If these conditions are met then the part enters startup
where it turns on power to the port. An internal signal,
POK_, is asserted high when V
OUT
is within 2V from
V
EE
. PGOOD_ status bits are set high if POK_ stays
high longer than t
PGOOD
. PGOOD immediately resets
when POK goes low.
The PWR_CHG bit sets when a port powers up or down.
PWR_EN sets when a port powers up and resets when a
port shuts down. The port shutdown timer lasts 0.5ms
and prevents other ports from turning off during that peri-
od, except in the case of emergency shutdowns (
RESET
= L, RESET_IC = H, V
EEUVLO
, V
DDUVLO
, and TSHD).
The MAX5945 always checks the status of all ports before
turning off. A priority logic system determines the order to
prevent the simultaneous turn-on or turn-off of the ports.
The port with the lesser ordinal number gets priority over
the others (i.e., port 1 turns on first, port 2 second, port 3
third and port 4 fourth). Setting PWR_OFF_ high turns off
power to the corresponding port.
M
Quad Network Power Controller
for Power-Over-LAN
______________________________________________________________________________________
15
PARAMETER
SYMBOL
V
OC
I
SC
V
VALID
MIN
—
—
2.8
MAX
30
5
10
UNITS
V
mA
V
ADDITIONAL INFORMATION
In detection mode only
In detection mode only
Open-Circuit Voltage
Short-Circuit Current
Valid Test Voltage
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
Accept Signature Resistance
Reject Signature Resistance
Open-Circuit Resistance
V
SLEW
R
GOOD
R
BAD
R
OPEN
—
19
< 15
500
0.1
26.5
> 33
—
V/μs
k
k
k
Accept Signature
Capacitance
C
GOOD
—
150
nF
Reject Signature
Capacitance
C
BAD
10
—
μF
Signature Offset Voltage
Tolerance
V
OS
0
2.0
V
Signature Offset Current
Tolerance
I
OS
0
12
μA
Table 1. PSE PI Detection Modes Electrical Requirement
(Table 33-2 of the IEEE 802.3af Standard)
MEASURED I
CLASS
(mA)
0 to 5
> 5 and < 8
8 to 13
> 13 and < 16
16 to 21
> 21 and < 25
25 to 31
> 31 and <35
35 to 45
> 45 and < 51
CLASSIFICATION
Class 0
May be Class 0 and 1
Class 1
May be Class 0, 1, or 2
Class 2
May be Class 0, 2, or 3
Class 3
May be Class 0, 3, or 4
Class 4
May be Class 0 or 4
Table 2. PSE Classification of a PD
(Table 33-4 of the IEEE 802.3af Standard)
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PDF描述 |
|---|---|
| MAX5945CAX | Quad Network Power Controller for Power-Over-LAN |
| MAX5945EAX | Quad Network Power Controller for Power-Over-LAN |
| MAX5948 | AND-OR-invert Gates 14-CFP -55 to 125 |
| MAX5948A | -48V Hot-Swap Controllers with External RSENSE |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5945CAX | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5945CAX+ | 功能描述:熱插拔功率分布 IEEE 802.3af Quad Net Pwr Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5945CAX+T | 功能描述:熱插拔功率分布 IEEE 802.3af Quad Net Pwr Controller RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5945CAX-T | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
| MAX5945EAX | 功能描述:熱插拔功率分布 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube |
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