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參數(shù)資料
| 型號： | AT1312B |
| 廠商： | Aimtron Technology Corp. |
| 英文描述： | High Efficiency, Constant Current White-LEDs Driver |
| 中文描述： | 高效率，恒定電流白光LED的驅(qū)動器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 413K |
| 代理商： | AT1312B |
AT1312A/B/C
Preliminary Product Information
High Efficiency, Constant Current
White-LEDs Driver
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW:
http://www.aimtron.com.tw
2/23/2006 REV:1.1 Email:
service@aimtron.com.tw
13
Application Information
External components of boost converter can be designed by performing simple
calculations.
Boost inductor
Inductor selection depends on input voltage, output voltage, maximum output 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
.
Diode selection
The output diode has average current of I
O
, and peak current the same as the
inductor’s peak current and a voltage rating at least 1.5 times the output voltage.
Schottky diode is recommended and it should be able to handle those current.
Output Capacitor
The AT1312 series are specially compensated to be stable with capacitors which have
a worst- case minimum value of 1uF at the particular V
OUT
being set. Output ripple
voltage requirements also determine the minimum value and type of capacitors.
Output ripple voltage consists of two components the voltage drop caused by the
switching current through the ESR of the output capacitor and the charging and
discharging of the output capacitor
:
I
V
×
For low ESR ceramic capacitors, the output ripple is dominated by the charging or
discharging of the output capacitor.
OSC
OUT
O
O
in
O
LPEAK
RIPPLE
f
C
V
V
ESR
I
V
×
+
×
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT1312BX | High Efficiency, Constant Current White-LEDs Driver |
| AT1312BX-GRE | High Efficiency, Constant Current White-LEDs Driver |
| AT1312C | High Efficiency, Constant Current White-LEDs Driver |
| AT1312CX | High Efficiency, Constant Current White-LEDs Driver |
| AT1312CX-GRE | High Efficiency, Constant Current White-LEDs Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT1312BX | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:High Efficiency, Constant Current White-LEDs Driver |
| AT1312BX-GRE | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:High Efficiency, Constant Current White-LEDs Driver |
| AT1312C | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:High Efficiency, Constant Current White-LEDs Driver |
| AT1312CX | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:High Efficiency, Constant Current White-LEDs Driver |
| AT1312CX-GRE | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:High Efficiency, Constant Current White-LEDs Driver |
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