9

LT1614

OPERATIO

500

µs/DIV

1614 F08

100mV/DIV

AC COUPLED

200mA

50mA

500ns/DIV

1614 F09

20mV/DIV

AC COUPLED

5V/DIV

500

µs/DIV

1614 F10

100mV/DIV

AC COUPLED

200mA

50mA

500ns/DIV

1614 F11

10mV/DIV

AC COUPLED

5V/DIV

Figure 8. Load Step Response of LT1614

with 33

µF Tantalum Output Capacitor

Figure 9. 33

µF “B” Case Tantalum Capacitor Has ESR Resulting

Figure 10. Replacing C3 with 22

µF Ceramic Capacitor

Lowers Output Voltage Ripple. 1nF Phase-Lead Capacitor

in Parallel with R1 Lowers Transient Excursion

Figure 11. 22

µF Ceramic Capacitor at

Output Reduces Output Ripple Voltage

1

2

8

7

3

4

6

5

L1

C2

L2

D1

R2

C3

GND

SHUTDOWN

1614 F12

C1

+

R1

Figure 12. Suggested Component Placement. Note: Cut in Ground Copper at D1’s Cathode