ACT4070
Figure 3:
ACT4070 2.5V/3A Output Application
C3
10nF
BS
L1 10µH/4A
R1 14k
4.5V to 30V
2.5V/3A
VIN
IN
SW
FB
VOUT
IC1
EN ACT4070
ENABLE
G
COMP
D1
40V
3A
C2
(CCOMP
3.3nF
C4 (COUT
)
)
22µF/10V
ceramic or
47µH/6.3 SP
Cap
+
R2
13k
C5
(CCOMP2
220pF
C1
10µF/35V
)
R3
(RCOMP
5.6k
)
: D1 is a 40V, 3A Schottky diode with low forward voltage, an IR 30BQ040 or SK34 equivalent. C4 can be either a ceramic capacitor
(Panasonic ECJ-3YB1C226M) or SP-CAP (Specialty Polymer) Aluminum Electrolytic Capacitor such as Panasonic EEFCD0J470XR.
The SP-Cap is based on aluminum electrolytic capacitor technology, but uses a solid polymer electrolyte and has very stable capaci-
tance characteristics in both operating temperature and frequency compared to ceramic, polymer, and low ESR tantalum capacitors.
Innovative Products. Active Solutions.
Copyright © 2006 Active-Semi, Inc.
www.active-semi.com
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