- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383444 > MAX5940AESA (MAXIM INTEGRATED PRODUCTS INC) IEEE 802.3af PD Interface Controller For Power-Over-Ethernet PDF資料下載
參數(shù)資料
| 型號： | MAX5940AESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 295K |
| 代理商： | MAX5940AESA |
M
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
6
_______________________________________________________________________________________
Pin Description
PIN
MAX5940A MAX5940B
1, 7
NAME
FUNCTION
—
N.C.
No Connection. Not internally connected.
—
1
UVLO
Undervoltage Lockout Programming Input for Power Mode. When UVLO is above its
threshold, the device enters power mode. Connect UVLO to V
EE
to use the default
undervoltage lockout threshold. Connect UVLO to an external resistor-divider to define a
threshold externally. The series resistance value of the external resistors must add to 25.5k
(±1%) and replaces the detection resistor. To keep the device in undervoltage lockout, pull
UVLO to between V
TH,G,UVLO
and V
REF,UVLO
.
2
2
RCLASS
Classification Setting. Add a resistor from RCLASS to V
EE
to set a PD class (see Tables 1
and 2).
3
3
GATE
Gate of Internal N-Channel Power MOSFET. GATE sources 10μA when the device enters
power mode. Connect an external 100V ceramic capacitor (C
GATE
) from GATE to OUT to
program the inrush current. Pull GATE to V
EE
to turn off the internal MOSFET. The detection
and classification functions operate normally when GATE is pulled to V
EE
.
4
4
V
EE
Negative Input Power. Source of the integrated isolation N-channel power MOSFET. Connect
V
EE
to -48V.
Output Voltage. Drain of the integrated isolation N-channel power MOSFET.
5
5
OUT
6
6
PGOOD
Power-Good Indicator Output, Active-High, Open-Drain. PGOOD is referenced to OUT.
PGOOD goes high impedance when V
OUT
is within 1.2V of V
EE
and when GATE is 5V above
V
EE
. Otherwise, PGOOD is pulled to OUT (given that V
OUT
is at least 5V below GND).
Connect PGOOD to the ON pin of a downstream DC-DC converter.
—
7
PGOOD
Power-Good Indicator Output, Active-Low, Open-Drain.
PGOOD
is referenced to V
EE
.
PGOOD
is pulled to V
EE
when V
OUT
is within 1.2V of V
EE
and when GATE is 5V above V
EE
.
Otherwise,
PGOOD
goes high impedance. Connect
PGOOD
to the
ON
pin of a downstream
DC-DC converter.
8
8
GND
Ground. GND is the positive input terminal.
Detailed Description
Operating Modes
The PD front-end section of the MAX5940A/MAX5940B
operates in 3 different modes, PD detection signature,
PD classification, and PD power, depending on its input
voltage (V
IN
= GND - V
EE
). All voltage thresholds are
designed to operate with or without the optional diode
bridge while still complying with the IEEE 802.3af stan-
dard (see Figure 4).
Detection Mode (1.4V
≤
V
IN
≤
10.1V)
In detection mode, the power source equipment (PSE)
applies two voltages on V
IN
in the range of 1.4V to
10.1V (1V step minimum), and then records the current
measurements at the two points. The PSE then com-
putes
V/
I to ensure the presence of the 25.5k
sig-
nature resistor. In this mode, most of the MAX5940A/
MAX5940B internal circuitry is off and the offset current
is less than 10μA.
If the voltage applied to the PD is reversed, install pro-
tection diodes on the input terminal to prevent internal
damage to the MAX5940A/MAX5940B (see the
Typical
Application Circuits
). Since the PSE uses a slope tech-
nique (
V/
I) to calculate the signature resistance, the
DC offset due to the protection diodes is subtracted
and does not affect the detection process.
Classification Mode (12.6V
≤
V
IN
≤
20V)
In the classification mode, the PSE classifies the PD
based on the power consumption required by the PD.
This allows the PSE to efficiently manage power distrib-
ution. The IEEE 802.3af standard defines five different
classes as shown in
Table
1. An external resistor (R
CL
)
connected from RCLASS to V
EE
sets the classification
current.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5940BESA | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| MAX5941B | IEEE 802.3af-Compliant Power-Over-Ethernet Interface/PWM Controller for Power Devices |
| 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% |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5940AESA+ | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af PD Int 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 |
| MAX5940AESA+T | 功能描述:輸入/輸出控制器接口集成電路 IEEE 802.3af PD Int 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 |
| MAX5940AESA-T | 功能描述:輸入/輸出控制器接口集成電路 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 |
| MAX5940BCSA+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX5940BCSA+T | 制造商:Maxim Integrated Products 功能描述:IEEE 802.3AF PD INTERFACE CONTROLLER FOR POWER-OVER-ETHERNET - Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。