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LTC1422IN8 数据表(PDF) 16 Page - Linear Technology

部件名 LTC1422IN8
功能描述  Hot Swap Controller
PDF  16 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1422IN8 数据表(HTML) 16 Page - Linear Technology

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LTC1422
©LINEAR TECHNOLOGY CORPORATION 1997
1422fa LT/TP 0300 2K REV A • PRINTED IN USA
TYPICAL APPLICATION
PART NUMBER
DESCRIPTION
COMMENTS
LTC1421
Hot Swap Controller
24-Pin Multiple Supplies
LT1640L/LT1640H
Negative Voltage Hot Swap Controller in SO-8
Operates from –10V to – 80V
LT1641
High Voltage Hot Swap Controller in SO-8
Operates from 9V to 80V
LT1642
Fault Protected Hot Swap Controller
Operates Up to 16.5V, Protected to 33V
LTC1643L/LTC1643H
PCI-Bus Hot Swap Controller
3.3V, 5V and
±12V in Narrow 16-Pin SSOP
LT1645
2-Channel Hot Swap Controller
Operates from 1.2V to 12V, Power Sequencing
LTC1647
Dual Hot Swap Controller in SO-8 or SSOP-16
Two ON Pins, Operates from 2.7V to 16.5V
RELATED PARTS
1
2
3
4
8
7
6
5
VCC
SENSE
GATE
FB
LOAD
+
–
C3
100
µF
100V
C5
0.22
µF
100V
RESET
ON
TIMER
GND
LTC1422
Q1
IRF530
3
2
7
4
1422 F17
C1
0.47
µF
25V
D1
7.5V
1N755A
R6
1M
5%
OPAMP
R7
270k
5%
C2
0.1
µF
25V
R4
10k
5%
R5
15k
5%
R1
36k
5%
R2
1.2k
5%
FUSE
R3
10
Ω
5%
RSENSE
0.02
Ω
5%
RMIRROR
39
Ω
5%
IMIRROR
IMIRROR
ILOAD
48V
+
–
Q2
VN2222L
–
+
LT1006
RTRIP
10
Ω
5%
+
C4
1
µF
25V
Figure 17. Switching 48V with Current Sensing
Current Sensing with 48V Applications
In the LTC1422, the SENSE pin threshold is 50mV below
the VCC pin. Typically, the current sense resistor is con-
nected to the VCC pin, but in 48V applications the sense
resistor is connected to the negative terminal of the 48V
supply. The circuit in Figure 17 translates the current in the
sense resistor to a resistor connected to the LTC1422
SENSE pin.
The voltage drop across the current sense resistor RSENSE
is proportional to the load current ILOAD. The voltage drop
across RSENSE is buffered by the op amp follower and is
forced on RMIRROR.
The mirror current can be described as: IMIRROR = ILOAD •
RSENSE/RMIRROR. The mirror current flows through the
trip resistor RTRIP. When the mirror current generates
50mV across RTRIP, the LTC1422 will latch the GATE pin
low (50mV = IMIRROR • RTRIP = ILOAD • RSENSE/RMIRROR •
RTRIP). This example uses a 48V input but this translation
circuit can be used anywhere the current sense resistor is
not tied to VCC.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com



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