APW7143 Ver la hoja de datos (PDF) - Anpec Electronics
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APW7143 Datasheet PDF : 19 Pages
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APW7143
Typical Application Circuits (Cont.)
2. 4.3~14V Single Power Input Step-down Converter(with ceramic Input/Output Capacitor)
1
VIN
Enable
Shutdown
6
EN
U1
LX 8
LX 7
APW7143
5 COMP
R3
FB 4
C1
L1
D1
R1
±1%
VIN
VOUT
C2
C3
AGND
R2
3
±1%
C4
Optional
a. Cost-effective Feedback Compensation (C4 is not connected)
VIN(V)
12
12
12
12
12
12
12
12
5
5
5
5
VOUT(V)
5
5
3.3
3.3
2
2
1.2
1.2
3.3
3.3
1.2
1.2
L1(µH)
6.8
6.8
4.7
4.7
3.3
3.3
2.2
2.2
2.2
2.2
2.2
2.2
C2(µF)
22
44
22
44
22
44
22
44
22
44
22
44
C2 ESR(mΩ)
5
3
5
3
5
3
5
3
5
3
5
3
R1(kΩ)
63.0
63.0
46.9
46.9
30.0
30.0
7.5
7.5
46.9
46.9
7.5
7.5
b. Fast-Transient-Response Feedback Compensation (C4 is connected)
R2(kΩ)
12
12
15
15
20
20
15
15
15
15
15
15
R3(kΩ)
10.0
20.0
10.0
22.0
10.0
20.0
8.2
16.0
8.2
20.0
3.0
7.5
C3(pF)
1500
1500
1500
1500
1500
1500
1800
1800
680
680
1800
1800
VIN(V)
12
12
12
12
12
12
12
12
5
5
5
5
VOUT(V)
5
5
3.3
3.3
2
2
1.2
1.2
3.3
3.3
1.2
1.2
L1(µH)
6.8
6.8
4.7
4.7
3.3
3.3
2.2
2.2
2.2
2.2
2.2
2.2
C2(µF) C2 ESR(mΩ)
22
5
44
3
22
5
44
3
22
5
44
3
22
5
44
3
22
5
44
3
22
5
44
3
R1(kΩ)
63.0
63.0
46.9
46.9
30.0
30.0
7.5
7.5
46.9
46.9
7.5
7.5
R2(kΩ)
12
12
15
15
20
20
15
15
15
15
15
15
C4(pF)
47
47
47
47
47
47
150
150
56
56
330
330
R3(kΩ)
33.0
68.0
22.0
47.0
13.0
27.0
7.5
15.0
20.0
43.0
3.3
8.2
C3(pF)
470
470
680
680
1200
1200
2200
2200
220
220
1800
1500
Copyright © ANPEC Electronics Corp.
11
Rev. A.1 - Apr., 2008
www.anpec.com.tw
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