參數(shù)資料
型號： LTC1422IS8#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： Hot Swap Controller; Package: SO; No of Pins: 8; Temperature Range: -40°C to +85°C
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： 0.150 INCH, PLASTIC, SOP-8
文件頁數(shù)： 8/16頁
文件大?。?/td> 193K
代理商： LTC1422IS8#TRPBF
16
LTC1422
1422fb
LINEAR TECHNOLOGY CORPORATION 1997
LT/TP 0503 1K REV B PRINTED IN USA
TYPICAL APPLICATION
U
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
F
100V
C5
0.22
F
100V
RESET
ON
TIMER
GND
LTC1422
Q1
IRF530
3
2
7
4
1422 F17
C1
0.47
F
25V
D1
7.5V
1N755A
R6
1M
5%
OPAMP
R7
270k
5%
C2
0.1
F
25V
R4
10k
5%
R5
15k
5%
R1
36k
5%
R2
1.2k
5%
FUSE
R3
10
5%
RSENSE
0.02
5%
RMIRROR
39
5%
IMIRROR
ILOAD
48V
+
–
Q2
VN2222L
–
+
LT1006
RTRIP
10
5%
+
C4
1
F
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.com
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