LT1614 Просмотр технического описания (PDF) - Linear Technology

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LT1614

Inverting 600kHz Switching Regulator

Linear Technology 

U

OPERATIO

LT1614

VOUT

100mV/DIV

AC COUPLED

200mA

ILOAD

50mA

500µs/DIV

1614 F08

Figure 8. Load Step Response of LT1614

with 33µF Tantalum Output Capacitor

VOUT

20mV/DIV

AC COUPLED

VSW

5V/DIV

500ns/DIV

1614 F09

Figure 9. 33µF “B” Case Tantalum Capacitor Has ESR Resulting

in 40mVP-P Voltage Ripple at Output with 200mA Load

VOUT

100mV/DIV

AC COUPLED

200mA

ILOAD

50mA

500µs/DIV

1614 F10

Figure 10. Replacing C3 with 22µF Ceramic Capacitor

Lowers Output Voltage Ripple. 1nF Phase-Lead Capacitor

in Parallel with R1 Lowers Transient Excursion

VOUT

10mV/DIV

AC COUPLED

VSW

5V/DIV

500ns/DIV

1614 F11

Figure 11. 22µF Ceramic Capacitor at

Output Reduces Output Ripple Voltage

SHUTDOWN

R1 R2

1

RC

2

CC 3

4

D1

GND

C3

L2

C1

+

8

7

6

5

C2

VIN

L1

1614 F12

VOUT

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

9

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