LTC4211CMS-PBF Просмотр технического описания (PDF) - Linear Technology
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LTC4211CMS-PBF Datasheet PDF : 40 Pages
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LTC4211
TYPICAL APPLICATION
LOW COST OVERVOLTAGE PROTECTION
There is an alternative method to implementing the over-
voltage protection using a resistor divider at the FILTER
pin (see Figures 27 and 28). In this implementation, the
SLOW COMP is NULL in Normal Mode. Only the FAST
COMP circuit breaker is available and the current limit
level is 150mV/RSENSE. During the soft-cycle, the inrush
current servo loop is at 50mV/RSENSE. So, the heavy load
should only turn on at/after the end of second cycle where
the RESET pin goes high.
5V
FAULT
RESET
ON/OFF
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
LONG
SHORT
SHORT
SHORT
R4
10k
Z1*
R3
10Ω
C1
0.1μF
R5
R8
10k 4.3k
R6 R7
10k 10k
R9
750Ω
LONG
GND
LTC4211
1 RESET FAULT 10
2 ON
VCC 9
3 FILTER SENSE 8
4 TIMER GATE 7
CTIMER
10nF
5
GND
FB 6
RSENSE
0.007Ω
Q1
Si4410DY
R1
36k +
R2
15k
VOUT
5V
5A
CLOAD
4211 F27
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
Figure 27. LTC4211MS High Side Overvoltage Protection Implementation
(In Normal Mode, SLOW COMP Is Disabled. In Soft-Start Cycle, ISOFTSTART Is Still 50mV/RSENSE)
5V
FAULT
RESET
ON/OFF
BACKPLANE PCB EDGE
CONNECTOR CONNECTOR
(FEMALE) (MALE)
LONG
SHORT
SHORT
SHORT
R3
10k Z1*
R7
10Ω
C1
0.1μF
R4
10k
R5
R6
10k
10k
LONG
GND
RSENSE
Q1
0.007Ω Si4410DY
LTC4211
1 RESET FAULT 10
2 ON
VCC 9
3 FILTER SENSE 8
4 TIMER GATE 7
CTIMER
10nF
5
GND
FB 6
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
4211 F28
R1
3.6k +
R2
750Ω
CLOAD
R8
750Ω
VOUT
5V
5A
Figure 28. LTC4211MS Low Side Overvoltage Protection Implementation
(In Normal Mode, SLOW COMP Is Disabled. In Soft-Start Cycle, ISOFTSTART Is Still 50mV/RSENSE)
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40 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
COMMENTS
24-Pin, Operates from 3V to 12V and Supports – 12V
8-Pin, Operates from 2.7V to 12V
8-Pin, Operates from –10V to –80V
8-Pin, Operates from 9V to 80V, Latch-Off/Auto Retry
16-Pin, Overvoltage Protection to 33V
16-Pin, 3.3V, 5V and ±12V, 1V Precharge, PCI Reset Logic
8-Pin, 16-Pin, Operates from 2.7V to 16.5V
Operates from 1.7V to 16.5V
4211fb
LT 0312 REV B • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2006
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