Datasheet

LTM8023
15
8023fj
For more information www.linear.com/LTM8023
ripple filtering and can slightly improve the efficiency of the
circuit, though it is likely to be the largest component in the
circuit. An alternative solution is shown in Figure
6b. A 0.7Ω
resistor is added in series with the input to eliminate the
voltage overshoot (it also reduces the peak input current).
A 0.1µF capacitor improves high frequency filtering. This
solution is smaller and less expensive than the electrolytic
capacitor. For high input voltages its impact on efficiency
is minor, reducing efficiency less than one-half percent
for a 5V output at full load operating from 24V.
Figure 6. A Well Chosen Input Network Prevents Input Voltage Overshoot and Ensures Reliable
Operation When the LTM8023 is Connected to a Live Supply
APPLICATIONS INFORMATION
+
LTM8023
4.7µF
V
IN
20V/DIV
I
IN
10A/DIV
20µs/DIV
V
IN
CLOSING SWITCH
SIMULATES HOT PLUG
I
IN
(6a)
(6b)
LOW
IMPEDANCE
ENERGIZED
24V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
LTM8023
4.7µF0.1µF
0.7Ω
V
IN
20V/DIV
I
IN
10A/DIV
20µs/DIV
DANGER
RINGING V
IN
MAY EXCEED
ABSOLUTE MAXIMUM RATING
(6c)
+
LTM8023
4.7µF
22µF
35V
AI.EI.
8023 F06
V
IN
20V/DIV
I
IN
10A/DIV
20µs/DIV
+
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