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LT4220 PDF预览

LT4220

更新时间: 2024-11-10 22:30:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
16页 268K
描述
Dual Supply Hot Swap Controller

LT4220 数据手册

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LT4220  
Dual Supply  
Hot Swap Controller  
U
FEATURES  
DESCRIPTIO  
Hot SwapTM Controller for Positive  
The LT®4220 16-pin dual voltage Hot Swap controller  
allows a board to be safely inserted and removed from a  
live backplane. The device operates with any combination  
of 2.7V to 16.5V and –2.7V to –16.5V supplies. Using two  
external N-channel pass transistors, the board supply  
voltages can be ramped up at an adjustable rate. A select-  
able tracking mode allows dual supply tracking control for  
ramping the positive and negative supplies together.  
and Negative Supplies  
Supply Tracking Mode  
±2.7V to ±16.5V Operation  
Analog Current Limit with Foldback  
Allows Safe Board Insertion and Removal  
from a Live Backplane  
Open-Collector Power Good Comparators  
Automatic Retry or Latchoff After a Current Fault  
The LT4220 features foldback current limit and latches off  
both gates if either supply remains in current limit longer  
than an adjustable time period. The IC can be configured  
for automatic restart after a delay set by the same timer.  
Dual Undervoltage Lockout Comparator Inputs  
Current Fault IndUication  
APPLICATIO S  
A power good signal indicates when the output voltages  
monitoredby thetwoFBcomparatorsarewithintolerance,  
and the gate drive signals are at their full on voltage.  
Live Board Insertion  
RAID Systems  
–5.2V ECL Supplies  
The LT4220 is available in a 16-lead narrow SSOP  
package.  
Industrial Controls  
Split Supply Systems  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Hot Swap is a trademark of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
±12V 10A Hot Swap Controller  
+
R
Q1  
S
+
0.005  
SUB85N03-04  
V
12V  
CC  
IN  
12V  
OUT  
+
V
V
R13  
10Ω  
C1  
10nF  
+
Z1*  
R5  
10Ω  
R6  
1k  
C4  
100nF  
CL1  
7
16  
15  
SENSE  
14  
GATE  
+
+
R15  
20k  
12V  
IN  
R1  
V
TRACK  
D1  
CC  
R9  
10  
13  
V
+
36.5k  
IN4001  
PWRGD  
12  
36.5k  
+
ON  
R16, 20k  
+
FB  
11  
8
R2  
4.99k  
FAULT  
TIMER  
12V  
+
R10  
4.99k  
C7  
V
OUT  
10nF  
C6  
1µF  
LT4220  
9
6
R12  
4.99k  
GND  
–12V  
5
R4  
4.99k  
C8  
10nF  
V
IN  
FB  
R11  
36.5k  
ON  
D2  
IN4001  
–12V  
V
EE  
SENSEK SENSE  
GATE  
R3  
36.5k  
C2  
10nF  
V
OUT  
1
2
3
4
R8  
1k  
C5  
1µF  
TIME (10ms/DIV)  
C3  
100nF  
+
R7  
CL2  
10Ω  
Z2*  
R14  
10Ω  
R
S
0.005Ω  
V
IN  
–12V  
–12V  
V
OUT  
V
Q2  
SUB85N03-04  
EE  
* 1SMA13AT3 TRANSIENT  
VOLTAGE SUPPRESSOR  
4220 TA01  
4220f  
1

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