参数资料
型号: LTC4211CMS8#TR
厂商: Linear Technology
文件页数: 15/40页
文件大小: 321K
描述: IC CONTROLLER HOT SWAP 8-MSOP
标准包装: 2,500
类型: 热交换控制器
应用: 通用
内部开关:
电源电压: 2.5 V ~ 16.5 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
供应商设备封装: 8-MSOP
包装: 带卷 (TR)
其它名称: LTC4211CMS8TR
LTC4211
15
4211fb
OPERATION
The C
TIMER
 value is vital to ensure a proper start-up and
reliable operation. A system may not start up if a timing
period is set too short relative to the time needed for the
output voltage to ramp up from zero to its rated value.
Conversely, this timing period should not be too long as
an output short can occur at start-up causing the exter-
nal MOSFET to overheat. A good starting point is to set
C
TIMER
 = 10nF and adjust its value accordingly to suit the
specific applications.
OPERATING SEQUENCE
Power-Up, Start-Up Check and Plug-In Timing Cycle
The sequence of operation for the LTC4211 is illustrated
in the timing diagram of Figure 5. When a PC board is
inserted into a live backplane, the LTC4211 first performs
Figure 5. Normal Power-Up Sequence
V
CC
ON
2糀
2糀
10糀
PLUG-IN CYCLE
FIRST TIMING CYCLE
200糀
POWER
GOOD
(V
FB
 > V
REF
)
V
TMR
 = V
REF
TIMER
1  2
3   4 5
6
7   8
9
RESET PULLED LOW DUE TO POWER BAD
10
SLOW COMPARATOR ARMED
CHECK FOR GATE < 0.2V
FAST COMPARATOR ARMED
CHECK FOR FILTER LOW (
REF
  80mV)
CHECK FOR FAULT HIGH (>V
REF
 + 50mV)
ON GOES LOW
GATE
V
OUT
RESET
POWER BAD
(V
FB
 < V
REF
)
SOFT-START CYCLE
SECOND TIMING CYCLE
4211 F05
Table 1. t
TIMER
 vs C
TIMER
C
TIMER
t
TIMER
0.0033糉
2.0ms
0.0047糉
2.9ms
0.0068糉
4.2ms
0.0082糉
5.1ms
0.01糉
6.2ms
0.015糉
9.3ms
0.022糉
13.6ms
0.033糉
20.4ms
0.047糉
29.0ms
0.068糉
42.0ms
0.082糉
50.7ms
0.1糉
61.8ms
0.15糉
92.7ms
0.22糉
136ms
0.33糉
204ms
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