參數(shù)資料
型號(hào): LTC4211IMS8
廠商: Linear Technology
文件頁(yè)數(shù): 27/40頁(yè)
文件大?。?/td> 321K
描述: IC CONTROLLER HOT SWAP 8-MSOP
標(biāo)準(zhǔn)包裝: 50
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開(kāi)關(guān): 無(wú)
電源電壓: 2.5 V ~ 16.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 管件
LTC4211
27
4211fb
APPLICATIONS INFORMATION
+
V
CC
SENSE
LTC4211
8
2
3
4
7
6
C
LOAD
V
OUT
12V
3A
GND
4211 F17
5
1
R4
12.4k
GATE
GND
TIMER
PCB CONNECTION SENSE
C
TIMER
8.2nF
FB
ON
SHORT
LONG
V
CC
12V
GND
LONG
Z1 = 1SMA12A OR SMAJ12A
** HIGHLY RECOMMENDED
RESET
R2
10k
R1
61.9k
R
X
10?/DIV>
R
SENSE
0.012?/DIV>
PCB EDGE
CONNECTOR
(MALE)
M1
Si4410DY
Z1**
R
G
100?/DIV>
R3
93.1k
R5
10k
LOGIC
RESET
C
X
100nF
BACKPLANE
CONNECTOR
(FEMALE)
12V Hot Swap Application
Figure 17 shows a 12V, 3A Hot Swap application circuit.
The resistor divider R1/R2 programs the undervoltage
lockout externally and allows the system to start up after
V
CC
 increases above 9.46V. The resistor divider R3/R4
monitors V
OUT
 and signals the RESET pin when V
OUT
 
goes above 10.54V. Transient voltage suppressor Z1 and
snubber network (C
X
, R
X
) are highly recommended to
protect the 12V applications system from ringing and
voltage spikes. R
G
 is recommended for V
CC
 > 10V and it
can minimize high frequency parasitic oscillations in the
power MOSFET.
AUTORETRY AFTER A FAULT
To configure the LTC4211 to automatically retry after a
fault condition, the FAULT and ON pins can be connected
to a pull-up resistor (R
AUTO
) to the supply, as shown in
Figure 17. 12V Hot Swap Application
Figure 18. In this case, the autoretry circuitry will attempt
to restart the LTC4211 with a 50% duty cycle, as shown
in the timing diagram of Figure 19. To prevent overheat-
ing the external MOSFET and other components during
the autoretry sequence, adding a capacitor (C
AUTO
) to the
circuit introduces an RC time constant (t
OFF
) that adjusts
the autoretry duty cycle. Equation 14 gives the autoretry
duty cycle, modified by this external time constant:
 
utoretryDutyCycle H
t
TIMER
t   +2"t
"100%
 
(14)
where t
TIMER
 = LTC4211 system timing(see TIMER func-
tion) and t
OFF
 is a time needed to charge capacitor C
AUTO
 
from 0V to the ON pin threshold (1.316V).
In Figure 18 with R
AUTO
 = 1M, the external RC time constant
is set at 1 second, the t
TIMER
 delay equals 6.2ms and the
autoretry duty cycle drops from 50% to 2.5%.
Figure 18. LTC4211MS Autoretry Application
FAULT
V
CC
LTC4211MS
SENSE
GATE
FB
1
2
3
4
5
10
R
SENSE
0.007?/DIV>
Q1
Si4410DY
9
8
7
6
RESET
ON
FILTER
TIMER
C
TIMER
10nF
GND
C
FILTER
100pF
R
AUTO
(SEE NOTE)
R
PULL-UP
10k
C
AUTO
1糉
R3
10?/DIV>
Z1*
NOTE:
Q1 MOUNTED TO 300mm
2
COPPER AREA
R
AUTO
 = 1M YIELDS 2.5%
DUTY CYCLE AND Q1 T
CASE
 = 50癈
R
AUTO
 = 3.2M YIELDS 0.8%
DUTY CYCLE AND Q1 T
CASE
 = 37癈
Z1 = 1SMA10A OR SMAJ10A
* OPTIONAL
4211 F18
C1
0.1糉
R1
36k
V
OUT
5V
5A
C
LOAD
R2
15k
+
LONG
V
CC
5V
GND
RESET
LONG
PCB EDGE
CONNECTOR
(MALE)
BACKPLANE
CONNECTOR
(FEMALE)
SHORT
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