參數(shù)資料
型號(hào)： MAX5920
廠商： Maxim Integrated Products, Inc.
英文描述： Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125
中文描述： -48V熱插拔控制器，外置RSENSE
文件頁(yè)數(shù)： 14/18頁(yè)
文件大?。?/td> 310K
代理商： MAX5920
M
pulled high by the module
’
s internal pullup current
source, turning the module off. When the DRAIN volt-
age drops below V
DL
and the GATE voltage is greater
than
V
GATE
- V
GH
, Q2 turns on and the
PWRGD
pin
pulls low, enabling the module.
The
PWRGD
signal can also be used to turn on an LED
or optoisolator to indicate that the power is good
(Figure 14) (see the
Component Selection Procedure
section).
When the DRAIN voltage of the MAX5920B is high with
respect to V
EE
(Figure 12) or the GATE voltage is low, the
internal MOSFET Q3 is turned off so that I1 and the inter-
nal MOSFET Q2 clamp the PWRGD pin to the DRAIN pin.
MOSFET Q2 sinks the module
’
s pullup current, and the
module turns off.
When the DRAIN voltage drops below V
DL
and the
GATE voltage is greater than
V
GATE
- V
GH
, MOSFET
Q3 turns on, shorting I1 to V
EE
and turning Q2 off. The
pullup current in the module pulls the PWRGD pin high,
enabling the module.
GATE Pin Voltage Regulation
The GATE pin goes high when the following startup con-
ditions are met: the UV pin is high, the OV pin is low, the
supply voltage is above V
UVLOH
, and (V
SENSE
- V
EE
) is
less than 50mV. The gate is pulled up with a 45μA current
source and is regulated at 13.5V above V
EE
. The
MAX5920A/MAX5920B include an internal clamp that
ensures the GATE voltage of the external MOSFET never
exceeds 18V. During a fast-rising V
DD
, the clamp also
keeps the GATE and SENSE potentials as close as possi-
ble to prevent the FET from accidentally turning on. When
a fault condition is detected, the GATE pin is pulled low
with a 50mA current.
Thermal Shutdown
The MAX5920A/MAX5920B include internal die-tempera-
ture monitoring. When the die temperature reaches the
thermal-shutdown threshold, T
OT
, the MAX5920A/
MAX5920B pull the GATE pin low and turn off the external
MOSFET. If a good thermal path is provided between the
MOSFET and the MAX5920A/MAX5920B, the device
offers thermal protection for the external MOSFET.
Placing the MAX5920A/MAX5920B near the drain of the
external MOSFET offers the best thermal protection
because most of the power is dissipated in its drain.
After a thermal shutdown fault has occurred, the
MAX5920A/MAX5920B turn the external FET off. To
clear a thermal shutdown fault condition, toggle the UV
pin or cycle the power to the device. The device keeps
the external FET off for a minimum time of t
OFF
after UV
is toggled, allowing the MOSFET to cool down. The
device restarts after the temperature drops 20
°
C below
the thermal-shutdown threshold.
-48V Hot-Swap Controller
with External R
SENSE
14
______________________________________________________________________________________
V
EE
SENSE
GATE
DRAIN
V
DD
OV
UV
PWRGD
MAX5920A
-48V RTN
-48V
R4
549k
1%
R5
6.49k
1%
R6
10k
1%
R1
0.02
5%
R3
1k
5%
R2
10
5%
C1**
470nF
25V
Q1
IRF530
C2
15nF
100V
*
-48V RTN
(SHORT PIN)
C3
100
μ
F
100V
*DIODES INC. SMAT70A.
**OPTIONAL.
PWRGD
MOC207
R7**
51k
5%
Figure 14. Using
PWRGD
to Drive an Optoisolator
相關(guān)PDF資料
PDF描述
MAX5920AESA Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CDIP -55 to 125
MAX5920BESA Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 16-CFP -55 to 125
MAX5945 Quad Network Power Controller for Power-Over-LAN
MAX5945CAX Quad Network Power Controller for Power-Over-LAN
MAX5945EAX Quad Network Power Controller for Power-Over-LAN
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5920AESA 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
MAX5920AESA+ 功能描述:熱插拔功率分布 48V- Hot-Swap 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
MAX5920AESA+T 功能描述:熱插拔功率分布 48V- Hot-Swap 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
MAX5920AESA-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
MAX5920BESA 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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