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參數資料
| 型號： | AIC164227ZTR |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | 3-Pin One-Cell Step-Up DC/DC Converter |
| 中文描述： | 3引腳單細胞升壓型DC / DC轉換器 |
| 文件頁數： | 12/14頁 |
| 文件大?。?/td> | 251K |
| 代理商： | AIC164227ZTR |
AIC1642
12
E
L
=
2
Ipk
L
2
1
×
Power required from the inductor per cycle must
be equal or greater than
)
fsw
1
(
*
)
(I
*
)
V
V
(V
/f
P
OUT
IN
D
OUT
SW
L
+
=
In order for the converter to regulate the output.
When loading is over IOB, PFM controller oper-
ates in continuous mode. Inductor peak current
can be derived from
1
T
2L
+
I
+
=
2
x
ON
V
V
2
x
V
V
V
V
V
I
SW
IN
OUT
SW
IN
SW
D
OUT
PK
Valley current (Iv) is
1
2L
+
=
2
x
*
T
*
VSW
V
I
2
x
VSW
V
V
V
V
I
ON
IN
OUT
IN
SW
D
OUT
V
Table 1 Indicates resistance and height for each coil.
Power Inductor Type
Inductance
(
m
H )
22
47
100
22
47
47
100
47
100
33
Resistance (
W
)
Rated Current
(A)
0.7
0.5
0.3
2.7
1.8
0.7
0.5
0.7
0.5
1.2
Height
(mm)
0.10
0.18
0.38
0.08
0.14
0.25
0.50
0.25
0.50
0.11
DS1608
2.9
Coilcraft SMT Type
(www.coilcraft.com)
DO3316
5.2
Sumida SMT Type CD54
4.5
Hold SMT Type PM54
4.5
Hold SMT Type PM75
5.0
Capacitor Selection
A poor choice for an output capacitor can result in
poor efficiency and high output ripple. Ordinary
aluminum electrolytic, while inexpensive may
have unacceptably poor ESR and ESL. There are
low ESR aluminum capacitors for switch mode
DC-DC converters which work much well than
general unit. Tantalum capacitors provide still bet-
ter performance at more expensive. OS-CON ca-
pacitors have extremely low ESR in a small size.
If capacitance is reduced, output ripple will in-
crease.
Most of the input supply is supplied by the input
bypass capacitor, the capacitor voltage rating
should be at least 1.25 times greater than a
maximum input voltage.
Diode Selection
Speed, forward drop, and leakage current are the
three main considerations in selecting a rectifier
diode. Best performance is obtained with Schot-
tky rectifier diode such 1N5819. Motorola makes
MBR0530 in surface mount. For lower output
power a 1N4148 can be used although efficiency
and start-up voltage will suffer substantially.
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