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ACT4060B Datasheet(PDF) 7 Page - Active-Semi, Inc

Part # ACT4060B
Description  18V/2A Step-Down DC/DC Converter
PDF  16 Pages
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Manufacturer  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT4060B Datasheet(HTML) 7 Page - Active-Semi, Inc

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ACT4060B
Rev 1, 23-May-12
®
Innovative PowerTM
- 7 -
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
APPLICATIONS INFORMATION
Output Voltage Setting
Figure 1:
Output Voltage Setting
Figure 1 shows the connections for setting the
output voltage. Select the proper ratio of the two
feedback resistors RFB1 and RFB2 based on the
output voltage. Typically, use RFB2 ≈ 10kΩ and
determine RFB1 from the following equation:
Table 1:
Recommended Resistance Values
Inductor Selection
The inductor maintains a continuous current to the
output load. This inductor current has a ripple that is
dependent on the inductance value:
Higher inductance reduces the peak-to-peak ripple
current. The trade off for high inductance value is
the increase in inductor core size and series
resistance, and the reduction in current handling
capability. In general, select an inductance value L
based on ripple current requirement:
where VIN is the input voltage, VOUT is the output
voltage, fSW is the switching frequency, ILOADMAX is
the maximum load current, and KRIPPLE is the ripple
factor. Typically, choose KRIPPLE = 20~40% to
correspond to the peak-to-peak inductor ripple
current being 20~40%
of the maximum load
current.
With a selected inductor value the peak-to-peak
inductor current is estimated as:
The peak inductor current is estimated as:
The selected inductor should not saturate at ILPK.
The maximum output current is calculated as:
LLIM is the internal current limit, which is typically
3.5A, as shown in Electrical Characteristics Table.
(1)
⎟
⎠
⎞
⎜
⎝
⎛
−
=
1
923
.
0
2
1
V
V
R
R
OUT
FB
FB
(2)
(
)
RIPPLE
LOADMAX
SW
IN
OUT
IN
OUT
K
I
f
V
V
V
V
L
_
×
=
(3)
(
)
SW
IN
OUT
IN
OUT
PK
LPK
f
V
L
V
V
V
I
×
×
×
=
_
_
PK
LPK
LOADMAX
LPK
_
I
2
1
I
I
+
=
(4)
(5)
PK
LPK
LIM
OUTMAX
I
2
1
I
I
_
_
=
VOUT
R1
R2
5.0V
47kΩ
10.5kΩ
3.3V
27.4kΩ
10.5kΩ
2.5V
18kΩ
10.5kΩ
1.8V
10.2kΩ
10.5kΩ
1.2V
3.3kΩ
10.5kΩ
1.0V
1kΩ
10.5kΩ
Table 2:
Inductor Values Range and Typical Compensation
VOUT
VIN
L
COUT
RCOMP
CCOMP
CCOMP2
5.0V
7V ~ 18V
10µH ~ 33µH
330µF/10V
25kΩ
2.2nF
220PF
22µF/ Ceramic × 2
10kΩ
2.2nF
N/A
3.3V
5V ~ 18V
8.2µH ~ 22µH
330µF/10V
21kΩ
2.2nF
220PF
22µF/ Ceramic × 2
8.2kΩ
2.2nF
N/A
1.8V
4.5V ~ 18V
5.6µH ~ 15µH
470µF/10V
12kΩ
4.7nF
220PF
22µF/ Ceramic × 2
8.2kΩ
4.7nF
N/A
1.2V
4.5V ~ 16V
4µH ~ 12µH
470µF/10V
12kΩ
10nF
220PF
22µF/ Ceramic × 2
8.2kΩ
10nF
N/A
4.5V ~ 13V
3.3µH ~ 10µH
470µF/10V
10kΩ
10nF
220PF
22µF/ Ceramic × 2
8.2kΩ
10nF
N/A
1.0V



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