参数资料
型号: LTC4240IGN#TR
厂商: Linear Technology
文件页数: 25/28页
文件大小: 493K
描述: IC CTRLR HOT SWAP CPCI 28-SSOP
标准包装: 2,500
类型: 热交换控制器
应用: CompactPCI?
内部开关:
电源电压: 3.3V,5V,±12V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 28-SSOP(0.154",3.90mm 宽)
供应商设备封装: 28-SSOP
包装: 带卷 (TR)
LTC4240
25
4240f
Disallowing bulk capacitors on the input power pins
mitigates the inrush current during hot plug. However, it
also tends to create a resonant circuit formed by the
inductance of the backplane power supply trace and the
parasitic capacitance of the plug-in board (mainly due to
the large power FET). Upon board insertion, the ringing of
this circuit will exhibit peak overshoot as high as 2.5 times
the steady state voltage (>30V for 12V).
There are two methods for abating the effects of these high
voltage transients: using zener clamps, and using snubber
APPLICATIO  S I FOR  ATIO
U
U
U
Figure 17. Place Transient Protection Device Close to the LTC4240
C1
0.047礔
C7
0.1礔
0.1礔
3V
IN
MEDIUM 3.3V
MEDIUM 5V
3V
SENSE
22
3V
OUT
24
5V
IN
21
5V
OUT
6
5V
SENSE
20
23
GATE
19
R3
10&
R4
10&
5V
OUT
AT 5A
3V
OUT
AT 7.6A
R5
1k
R1
0.005&
Q1
Si7880DP
Q2
Si7880DP
R2
0.007&
Z3
Z4
LTC4240*
1644 F17
GND
10
Z3, Z4: 1PMT5.0AT3
*ADDITIONAL DETAILS OMITTED FOR CLARITY
LONG 5V
LONG 3.3V
2.7&
R23
2.7&
R22, 2.74&
R21, 1.74&
Figure 15. 5V Supply Only Application Circuit
MEDIUM 5V
LONG
5V
C1
0.047礔
GND
21
3V
OUT
6
LTC4240*
22
5V
OUT
24
23
20
GATE
19
10
4240 F15
R5
1k
R22
2.74&
CompactPCI
BACKPLANE
CONNECTOR
(FEMALE)
CompactPCI
BACKPLANE
CONNECTOR
(MALE)
GND
5V
IN
5V
IN
D1
5V
SENSE
3V
IN
3V
SENSE
R4
10&
5V
OUT
R2
0.007&
Q2
Si7880DP
D2
D1, D2: BAV99
C
L(5VOUT)
Z4
*ADDITIONAL DETAILS OMITTED FOR CLARITY
Z4: 1PMT5.0AT3
GND
LTC4240*
10
1.2k
PUSHBUTTON
SWITICH
100&
V(I/O)
1k
GND
OFF/ON
28
BD_SEL#
4240 F16
*ADDITIONAL DETAILS OMITTED FOR CLARITY
CompactPCI
BACKPLANE
CONNECTOR
(FEMALE)
CompactPCI
BACKPLANE
CONNECTOR
(MALE)
Figure 16. BD_SEL# Pushbutton Toggle Switch
networks. Snubbers are RC networks whose time
constants are large enough to damp the inductance of the
parasitic resonant circuit. The snubber capacitor should
be 10X to 100X the value of the plug-in board parasitic
capacitance. The value of the series snubber resistor
should be large enough to damp the resulting
R-L-C circuit and is typically between 1& and 50&. These
protection networks should be mounted very close to the
LTC4240 in order to minimize parasitic inductance. This is
shown in Figure 17 for the 3.3V and 5V supplies.
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