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參數(shù)資料
| 型號： | AIC1641-27CW |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LOW VOLTAGE STEP-UP DC/DC CONVERTER |
| 中文描述： | 低電壓升壓型DC / DC變換器 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 160K |
| 代理商： | AIC1641-27CW |
AIC1641
LOW VOLTAGE STEP-UP DC/DC CONVERTER
SPEC NO: DS-1641-00 05/04/00
ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510
www.analog.com.tw
10
2L
+
+
=
2
x
T
V
V
I
2
x
V
V
V
V
V
I
ON
SW
IN
OUT
SW
IN
SW
D
OUT
PK
Valley current (Iv) is
2
+
=
2
x
T
V
V
I
2
x
V
V
V
V
V
I
ON
L
SW
IN
OUT
SW
IN
SW
D
OUT
V
Table 1 Indicates resistance and height for each coil.
Power Inductor Type
Inductance (
μ
H )
Resistance (
)
Rated Current (A)
Hieght
(mm)
47
0.25
0.7
Sumida SMT Type CD54
100
0.50
0.5
4.5
47
0.25
0.7
Hold SMT Type PM54
100
0.50
0.5
4.5
Hold SMT Type PM75
33
0.11
1.2
5.0
Huan Feng PIN Type V0810
33
40m
2
10.0
CAPACITOR SELECTION
A poor choice for a output capacitor can result in poor
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.
Most of the input supply is supplied by the input by-
passs capacitor, the capacitor voltage rating should be
at least 1.25 times greather 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 retifier di-
ode such 1N5819. Motorola makes MBR0530 in sur-
face mount. For lower output power a 1N4148 can be
used although efficiency and start-up voltage will suf-
fer substantially.
COMPONENT POWER DISSIPATION
Opeating in discontinuous mode, power loss in the
winding resistance of inductor can be approximate
equal to
(
)
(
)
OUT
OUT
D
OUT
V
ON
L
L
P
V
V
Rs
T
3
2
PD
+
=
where P
OUT
=V
OUT
* I
OUT
; Rs=Inductor DC R;
V
D
= Diode drop.
The power dissipated in a switch loss is
(
)
(
)
OUT
OUT
IN
D
OUT
ON
ON
L
P
V
V
V
V
R
T
3
2
PDsw
+
=
The power dissipated in rectifier diode is
(
)
OUT
OUT
D
P
V
V
PDd
=
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