AIC1638 데이터 시트보기 (PDF) - Analog Intergrations
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AIC1638 Datasheet PDF : 15 Pages
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Table 1 Indicates resistance and height for each coil.
AIC1638
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
SPEC NO: DS-1638-00 03/01/00
Power Inductor Type
Coilcraft SMT Type
(www.coilcraft.com)
DS1608
DO3316
Sumida SMT Type CD54
Hold SMT Type PM54
Hold SMT Type PM75
Inductance
( µH )
22
47
100
22
47
47
100
47
100
33
Resistance
(Ω)
0.10
0.18
0.38
0.08
0.14
0.25
0.50
0.25
0.50
0.11
Rated Current
(A)
0.7
Height
(mm)
0.5
2.9
0.3
2.7
5.2
1.8
0.7
4.5
0.5
0.7
4.5
0.5
1.2
5.0
CAPACITOR SELECTION
A poor choice for a 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 better than general
propose unit. Tantalum capacitors provide still better
performance at more expensive. OS-CON
capacitors have extremely low ESR in a small size.
If capacitance is reduced, output ripple will increase.
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 consideration in selecting a rectifier
diode. Best performance is obtained with Schottky
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.
COMPONENT POWER DISSIPATION
Operating in discontinuous mode, power loss in the
winding resistance of inductor can be approximate
equal to
PDL
=
2
3
TON
L
(Rs)
VOUT + VD
VOUT
(POUT)
where POUT=VOUT * IOUT ; Rs=Inductor DC R;
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500 FAX:(8863)577-2510
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