AIC1641 ETC [List of Unclassifed Manufacturers], AIC1641 Datasheet - Page 10

• Manufacturer Part Number: AIC1641
• Description: LOW VOLTAGE STEP-UP DC/DC CONVERTER
• Manufacturer: ETC [List of Unclassifed Manufacturers]

ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
Valley current (Iv) is
CAPACITOR SELECTION
A poor choice for a output capacitor can result in poor
Most of the input supply is supplied by the input by-
DIODE SELECTION
Speed, forward drop, and leakage current are the
I
efficiency and hight output ripple. Ordinary aluminum
electrolytics, while inexpensive may have unaccepta-
bly poor ESR and ESL. There are low ESR aluminum
capacitors for switch mode DC-DC converters which
work much better than general porpuse unit. Tantalum
capacitors provide still better performance at more ex-
pensive. OS-CON capacitors have extremely low ESR
in a small size. If capacitance is reduced, output ripple
will increase.
passs capacitor, the capacitor voltage rating should be
at least 1.25 times greather than a maximum input
voltage.
three main consideration in selecting a rectifier diode.
Best performance is obtained with Schottky retifier di-
ode such 1N5819. Motorola makes MBR0530 in sur-
face mount. For lower output power a 1N4148 can be
PK
Table 1 Indicates resistance and height for each coil.
Power Inductor Type
Sumida SMT Type CD54
Hold SMT Type PM54
Hold SMT Type PM75
Huan Feng PIN Type V0810
V
OUT
V
IN
V
V
D
SW
V
SW
x
2
I
OUT
V
IN
Inductance ( H )
2L
V
SW
100
100
T
47
47
33
33
ON
1
2
x
Resistance (
COMPONENT POWER DISSIPATION
Opeating in discontinuous mode, power loss in the
where P
V
The power dissipated in a switch loss is
The power dissipated in rectifier diode is
I
used although efficiency and start-up voltage will suf-
fer substantially.
winding resistance of inductor can be approximate
equal to
PDsw
PDd
LOW VOLTAGE STEP-UP DC/DC CONVERTER
PD
V
D
TEL: [phone] FAX:[phone]
www.analog.com.tw
= Diode drop.
0.25
0.50
0.25
0.50
0.11
40m
L
V
OUT
2
3
OUT
V
2
3
V
V
OUT
IN
T
D
T
L
=V
ON
V
L
ON
)
D
V
OUT
P
SW
Rs
OUT
V
R
Rated Current (A)
SW
ON
* I
V
OUT
OUT
V
V
x
2
OUT
OUT
; Rs=Inductor DC R;
I
0.7
0.5
0.7
0.5
1.2
OUT
2
SPEC NO: DS-1641-00 05/04/00
V
V
D
OUT
V
D
P
V
OUT
V
IN
IN
2
L
V
AIC1641
P
SW
OUT
Hieght
(mm)
10.0
T
4.5
4.5
5.0
ON
1
10
x
2