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LTC4240IGN 데이터시트(PDF) 25 Page - Linear Technology

부품명 LTC4240IGN
상세설명  CompactPCI Hot Swap Controller with I2C Compatible Interface
PDF  28 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC4240IGN 데이터시트(HTML) 25 Page - Linear Technology

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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
Figure 17. Place Transient Protection Device Close to the LTC4240
C1
0.047
µF
C7
0.1
µF
0.1
µF
3VIN
MEDIUM 3.3V
MEDIUM 5V
3VSENSE
22
3VOUT
24
5VIN
21
5VOUT
6
5VSENSE
20
23
GATE
19
R3
10
Ω
R4
10
Ω
5VOUT
AT 5A
3VOUT
AT 7.6A
R5
1k
R1
0.005
Ω
Q1
Si7880DP
Q2
Si7880DP
R2
0.007
Ω
Z3
Z4
LTC4240*
1644 F17
GND
10
Z3, Z4: 1PMT5.0AT3
*ADDITIONAL DETAILS OMITTED FOR CLARITY
LONG 5V
LONG 3.3V
2.7
Ω
R23
2.7
Ω
R22, 2.74
Ω
R21, 1.74
Ω
Figure 15. 5V Supply Only Application Circuit
MEDIUM 5V
LONG
5V
C1
0.047
µF
GND
21
3VOUT
6
LTC4240*
22
5VOUT
24
23
20
GATE
19
10
4240 F15
R5
1k
R22
2.74
Ω
CompactPCI
BACKPLANE
CONNECTOR
(FEMALE)
CompactPCI
BACKPLANE
CONNECTOR
(MALE)
GND
5VIN
5VIN
D1
5VSENSE
3VIN
3VSENSE
R4
10
Ω
5VOUT
R2
0.007
Ω
Q2
Si7880DP
D2
D1, D2: BAV99
CL(5VOUT)
Z4
*ADDITIONAL DETAILS OMITTED FOR CLARITY
Z4: 1PMT5.0AT3
GND
LTC4240*
10
1.2k
PUSHBUTTON
SWITICH
100
Ω
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
Ω and 50Ω. 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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