LT3592
APPLICATIONS INFORMATION
D4
V
V
V
IN
SW
IN
OUT
LT3592
SHDN
GND
FB
+
BACKUP
3592 F08
D4: MBR0540
Figure 8. Circuit to Address Reversed Input and Backpowering Issues
CLOSING SWITCH
SIMULATES HOT PLUG
I
IN
V
LT3592
GND
IN
I
V
IN
IN
10A/DIV
+
+
1μF
V
IN
20V/DIV
LOW
STRAY
5μs/DIV
IMPEDANCE
ENERGIZED
32V SUPPLY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
(9a)
LT3592
GND
V
IN
I
IN
10A/DIV
+
+
+
10μF
50V
2.2μF
V
IN
20V/DIV
5μs/DIV
(9b)
1Ω
LT3592
GND
V
IN
I
IN
10A/DIV
+
+
0.1μF
2.2μF
V
IN
20V/DIV
5μs/DIV
(9c)
3493 F09
Figure 9. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3592 is Connected to a Live Supply
3592fc
17