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LT4250

更新时间： 2024-11-11 11:45:15
品牌 Logo 应用领域
凌特 - Linear 二极管控制器
页数 文件大小 规格书
14页 185K
描述
Negative Voltage Diode-OR Controller

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中文翻译

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LTC4354  
Negative Voltage  
Diode-OR Controller  
and Monitor  
FeaTures  
DescripTion  
The LTC®4354 is a negative voltage diode-OR controller  
that drives two external N-channel MOSFETs. It replaces  
two Schottky diodes and the associated heat sink, saving  
power and area. The power dissipation is greatly reduced  
by using N-channel MOSFETs as the pass transistors.  
Power sources can easily be ORed together to increase  
total system power and reliability.  
n
Controls N-Channel MOSFETs  
n
Replaces Power Schottky Diodes  
n
Less Than 1µs Turn-off Time Limits Peak  
Fault Current  
80V Operation  
n
n
Smooth Switchover without Oscillation  
n
No Reverse DC Current  
n
Fault Output  
When first powered up, the MOSFET body diode conducts  
the load current until the pass transistor is turned on.  
The LTC4354 servos the voltage drop across the pass  
transistors to ensure smooth transfer of current from one  
transistor to the other without oscillation.  
n
Selectable Fault Thresholds  
n
Available in 8-Lead (3mm × 2mm) DFN and  
8-Lead SO Packages  
applicaTions  
The MOSFETs are turned off in less than 1µs whenever  
the corresponding power source fails or is shorted. Fast  
turn-off prevents the reverse current from reaching a level  
that could damage the pass transistors.  
n
AdvancedTCASystems  
n
–48V Distributed Power Systems  
n
Computer Systems/Servers  
Telecom Infrastructure  
Optical Networks  
n
n
A fault detection circuit with an open-drain output capable  
ofdrivinganLEDoropto-couplerindicateseitherMOSFET  
short, MOSFET open or supply failed.  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and  
Hot Swap, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners.  
Typical applicaTion  
–48V Diode-OR  
Power Dissipation vs Load Current  
–48V_RTN  
6
12k  
5
33k  
DIODE (MBR10100)  
4
V
CC  
POWER  
SAVED  
LOAD  
LTC4354  
GA  
FAULT  
3
2
V
SS  
DA DB  
2k  
GB  
LED  
2k  
1µF  
1
FET (IRF3710)  
V
V
= –48V  
= –48V  
A
B
4354 TA01  
IRF3710  
0
0
4
6
8
10  
2
CURRENT (A)  
IRF3710  
4354 TA01b  
4354fc  
1
1234567...14

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