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LTC1647-2 数据表(PDF) 17 Page - Linear Technology

部件名 LTC1647-2
功能描述  Dual Supply Hot Swap Controller for Advanced Mezzanine Card
PDF  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1647-2 数据表(HTML) 17 Page - Linear Technology

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LTC4223-1/LTC4223-2
17
422312f
APPLICATIONS INFORMATION
Supply Transient Protection
The supply inputs, AUXIN and 12VIN are fed directly from
the regulated output of the backplane supply, where bulk
bypassing assures a spike-free operating environment.
In other applications where the bulk bypassing is located
far from the LTC4223, spikes generated during output
short circuit events could exceed the absolute maximum
ratings for AUXIN and 12VIN. To minimize such spikes,
use wider traces or heavier trace plating to reduce the
power trace inductance. Also, bypass locally with a 10μF
electrolytic and 100nF ceramic, or alternatively clamp
the input with a transient voltage suppressor (Z1, Z2) as
shown in Figure 13. A 10Ω, 100nF snubber damps the
response and eliminates ringing. A recommended layout
of the 12V transient protection devices Z1, R1 and C1
around the LTC4223 is shown in Figure 12.
Figure 9. Auto-Retry after 12V Overcurrent Fault
FAULT
TIMER
12VGATE
12VOUT
VTMR
VTMR
VTMR
422312 F08
12VIN - 12VSENSE
200
μA
60mV
60mV
12
3
4 5
6
7
8
2
μA
FAULT PULLS LOW DUE TO
12V OVERCURRENT FAULT
START OF COOL-OFF CYCLE
START OF
DEBOUNCE CYCLE
RESET FAULT HIGH
FAULT PULLS LOW AND
RESTART OF COOL-OFF CYCLE
END OF DEBOUNCE CYCLE
START 12V GATE RAMP WHEN STARTUP CONDITIONS ARE MET
12V OUTPUT IN CURRENT LIMIT
RESTART OF
DEBOUNCE CYCLE
COOL-OFF CYCLE
DEBOUNCE CYCLE
FILTER DELAY
COOL-OFF CYCLE
2
μA2μA
10
μA
200
μA10μA
12VGATE REGULATES
422312 F10
12VSENSE
VSENSE
–
+
Q1
LTC4223
12VIN
12VGATE
VOUT
12IMON
ILOAD
RIN
5k
12V
TO SYSTEM
CONTROLLER
CS
1
μF
3.3V
LTC1197L
VREF
CLK
DOUT
+IN
–IN
VCC
GND
ROUT
165k
VOUT =
• VSENSE = 33 • VSENSE
ROUT
RIN
LOAD
Figure 10. High Side Current Sense with LTC1197L ADC



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