LTC4210 LINER [Linear Technology], LTC4210 Datasheet - Page 17

• Manufacturer Part Number: LTC4210
• Description: Dual Supply Hot Swap Controller for Advanced Mezzanine Card
• Manufacturer: LINER [Linear Technology]

Supply Transient Protection
The supply inputs, AUXIN and 12V
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 12V
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.
APPLICATIONS INFORMATION
12V
IN
- 12V
12V
12V
TIMER
FAULT
SENSE
GATE
OUT
FAULT PULLS LOW DUE TO
12V OVERCURRENT FAULT
START OF COOL-OFF CYCLE
200μA
60mV
IN
1
. To minimize such spikes,
V
TMR
COOL-OFF CYCLE
2μA
IN
are fed directly from
Figure 9. Auto-Retry after 12V Overcurrent Fault
DEBOUNCE CYCLE
START OF
2
10μA
RESET FAULT HIGH
3
V
DEBOUNCE CYCLE
TMR
2μA
LOAD
I
LOAD
Q1
Figure 10. High Side Current Sense with LTC1197L ADC
END OF DEBOUNCE CYCLE
4 5
12V
START 12V GATE RAMP WHEN STARTUP CONDITIONS ARE MET
LTC4223
GATE
12V
LTC4223-1/LTC4223-2
12V OUTPUT IN CURRENT LIMIT
SENSE
200μA
6
V
–
SENSE
V
60mV
OUT
+
FAULT PULLS LOW AND
RESTART OF COOL-OFF CYCLE
7
=
V
R
FILTER DELAY
12V
R
TMR
OUT
IN
12V
R
5k
12IMON
R
165k
GATE
IN
OUT
• V
IN
2μA
SENSE
REGULATES
= 33 • V
V
12V
OUT
COOL-OFF CYCLE
SENSE
+IN
–IN
LTC1197L
V
RESTART OF
DEBOUNCE CYCLE
REF
8
GND
10μA
422312 F08
V
CC
D OUT
422312 F10
CLK
CS
1μF
17
TO SYSTEM
CONTROLLER
422312f
3.3V