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參數(shù)資料
| 型號： | MAX5940B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| 中文描述： | IEEE 802.3af PD接口控制器，用于以太網(wǎng)供電 |
| 文件頁數(shù)： | 8/15頁 |
| 文件大?。?/td> | 295K |
| 代理商： | MAX5940B |
M
To adjust the UVLO threshold (MAX5940B only), con-
nect an external resistor-divider from GND to UVLO
and from UVLO to V
EE
. Use the following equations to
calculate R1 and R2 for a desired UVLO threshold:
R1 = 25.5k
- R2
where V
IN,EX
is the desired UVLO threshold. Since the
resistor-divider replaces the 25.5k
PD detection resis-
tor, ensure that the sum of R1 and R2 equals 25.5k
±1%. When using the external resistor-divider, the
MAX5940B has an external reference voltage hystere-
sis of 20% (typ). When UVLO is programmed external-
ly, the turn-off threshold is 80% (typ) of the new UVLO
threshold.
R
k
x
V
V
REF UVLO
,
IN EX
,
2
25 5
=
.
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
8
_______________________________________________________________________________________
R1
GND
UVLO
GND
(UVLO)
( ) MAX5940B.
GATE
R2
R3
MAX5940B
CLASSIFICATION
RCLASS
(PGOOD)
6.8V
EN
REF
2.46V
200mV
V
EE
V
GATE
1.2V, REF
5V, REF
Q4
PGOOD
OUT
Q3
Q1
Q2
EN
20%
Figure 2. Block Diagram
R1
UVLO
GND
V
EE
R2
V
IN
= 12V TO 67V
MAX5940B
Figure 3. Setting Undervoltage Lockout with an External
Resistor-Divider
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5940A-MAX5940B | Quadruple 2-Input Positive-NAND Buffers 14-CDIP -55 to 125 |
| MAX5940AESA | IEEE 802.3af PD Interface Controller For Power-Over-Ethernet |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| MAX5940BESA | 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 |
| MAX5940BESA+ | 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 |
| MAX5940BESA+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 |
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