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參數(shù)資料
| 型號(hào)： | AT1308 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Preliminary Product Information Micro-Power Step up DC-DC Converter |
| 中文描述： | 初步產(chǎn)品信息微功率升壓DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大小： | 377K |
| 代理商： | AT1308 |
AT1308
Preliminary Product Information
Micro-Power Step up DC-DC Converter
Power dissipation consideration
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 WWW:
http://www.aimtron.com.tw
Fax: 886-3-563-0879 Email:
service@aimtron.com.tw
13
Rev A ; 01/18/05
The AT1308 maximum power dissipation depends on the thermal resistance of the IC package and
circuit board, the temperature difference between the die junction and ambient air, and the rate of any
airflow. The power dissipation in the device depends on the operating conditions of the regulator.
The step-up converter dissipates power across the internal N-MOS as the controller ramps up the
inductor current. In continuous condition, the power dissipated internally can be approximated by :
D
V
V
OSC
in
×
12
D
R
L
f
V
I
P
ON
DS
in
O
O
boost
×
×
×
+
×
=
)
(
2
2
]
)
(
1
)
[(
w
here
I
O
: It is the load current.
f
OSC
: It is a switching frequency.
Applications Information
External components of boost converter can be designed by performing simple calculations. It need to
follow regulation by the output voltage and the maximum load current, as well as maximum and
minimum input voltages. Begin by selecting an inductor value. Once L is know, choose the diode and
capacitors.
Boost inductor
Inductor selection depends on input voltage, output voltage, maximum current , switching frequency
and availability of inductor values. The following boost circuit equations are useful in choosing the
inductor values based on the application. They allow the trading of peak current and inductor value
while allowing for consideration of component availability and cost.
The peak inductor current is given by:
I
I
I
LAVG
Lpeak
+
=
2
D
I
I
O
LAVG
L
=
1
where:
△
I
L
is the inductor peak-to-peak current ripple and is decided by:
D
L
OSC
in
L
f
V
I
×
=
D is the MOSFET turn on ratio and is decided by:
V
V
D
=
O
in
O
V
f
OSC
is the switching frequency.
The inductor should be chosen to be able to handle this current and inductor saturation current rating
should be greater than I
PEAK
.
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