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Lista de partido

ACT4082AUS-T

16V, 1.2A, 1.4MHz Step-Down DC/DC Converter in SOT23-6

Active-Semi, Inc 

Active-Semi

ACT4082A

Rev0, 16-May-08

Figure 3:

ACT4082A Optimized for Minimal External Components

The ACT4082A with provides excellent AC and DC results across a wide range of external component combinations. The circuit of

Figure 3 can be used to generate a 5V output from a 12V input utilizing a smaller (i.e. lower-cost) output capacitor while maintaining

good performance.

VIN

ON

OFF

2

IN

C1

10µF

6

BST

1

ACT4082ASW

3

EN

4

FB

G

5

RFB2

C3

22nF

L1

4.7µH

D1

B230A

RFB1

150kΩ?

28.7kΩ? 1%

1%

C2

4.7µF

VOUT

5V

Figure 4:

Circuit of Figure 3 (ILOAD = 150mA to 850mA)

Circuit of Figure 3

ILOAD = 150mA to 850mA

CH1

CH2

CH1: ILOAD, 500mA/div

CH2: VOUT, 100mV/div (AC Coupled)

TIME: 200µs/div

Figure 5:

Circuit of Figure 3 (ILOAD = 1A)

CH1

Circuit of Figure 3

ILOAD = 1A

CH2

CH1: VSW, 10V/div

CH2: VOUT, 20mV/div (AC Coupled)

TIME: 400ns/div

Innovative PowerTM

-9-

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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