Datasheet

9
LT1614
OPERATIO
U
500µs/DIV 1614 F08
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
200mA
50mA
500ns/DIV
1614 F09
V
OUT
20mV/DIV
AC COUPLED
V
SW
5V/DIV
500µs/DIV
1614 F10
V
OUT
100mV/DIV
AC COUPLED
I
LOAD
200mA
50mA
500ns/DIV
1614 F11
V
OUT
10mV/DIV
AC COUPLED
V
SW
5V/DIV
Figure 8. Load Step Response of LT1614
with 33µF Tantalum Output Capacitor
Figure 9. 33µF “B” Case Tantalum Capacitor Has ESR Resulting
in 40mV
P-P
Voltage Ripple at Output with 200mA Load
Figure 10. Replacing C3 with 22µF Ceramic Capacitor
Lowers Output Voltage Ripple. 1nF Phase-Lead Capacitor
in Parallel with R1 Lowers Transient Excursion
Figure 11. 22µF Ceramic Capacitor at
Output Reduces Output Ripple Voltage
1
2
8
7
3
4
6
5
L1
C2
L2
D1
R
C
R2
C
C
C3
V
IN
GND
SHUTDOWN
1614 F12
C1
+
V
OUT
R1
+
Figure 12. Suggested Component Placement. Note: Cut in Ground Copper at D1’s Cathode