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參數(shù)資料
| 型號(hào)： | AT1314 |
| 廠商： | Aimtron Technology Corp. |
| 英文描述： | High-Efficiency Step-Down Current Regulator For LEDs |
| 中文描述： | 高效率降壓型LED的電流調(diào)節(jié)器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 320K |
| 代理商： | AT1314 |
AT1314
Preliminary Product Information
High-Efficiency Step-Down
Current Regulator For LEDs
Applications Information
External components of step-down converter can be designed by performing simple
calculations. It must be 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.
PWM Dimming Control
EN is also used as a digital input, allowing LED brightness control with a
logic-level PWM signal applied directly to EN. The frequency range is from 100Hz
to 1kHz, while 0% duty cycle corresponds to zero current and 100% duty cycle
corresponds to full current. The error amplifier and compensation Capacitor form a
lowpass filter, so PWM dimming results in DC current to the LEDs without any
additional RC filters required
Inductor
Inductor selection depends on input voltage, output voltage, maximum current,
switching frequency and availability of inductor values. The following buck circuit
equations are useful in choosing the inductor values based on the application. Choose
an inductor that does not saturate under the maximum rating load conditions. The
magnitude of inductance is selected to maintain a peak to peak ripple current of 30%
of the maximum load current.
The peak inductor current is given by:
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
3/24/2006 REV:2.0 Email:
service@aimtron.com.tw
in
O
in
LAVG
L
LAVG
Lpeak
V
V
D
D
I
I
I
2
I
I
=
=
+
=
D is the MOSFET turn on ratio
where:
I
L
is the inductor peak-to-peak current ripple and is decided by:
V
L
f
L
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
.
OSC
L
O
in
OSC
O
in
L
f
I
D
V
×
D
V
V
I
×
=
×
=
)
(
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| AT1314S-GRE | High-Efficiency Step-Down Current Regulator For LEDs |
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| AT1361X_GRE | 1MHz,1A Synchronous Buck Converter |
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| AT1362A | Synchronous Buck Converter With Power Good Detector & LDO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT1314S-GRE | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:High-Efficiency Step-Down Current Regulator For LEDs |
| AT13169 | 制造商:Delphi Corporation 功能描述:SPRING HOLDER |
| AT-1319-10-8-ST-ADAPT- | 制造商:TE Connectivity 功能描述:AT-1319-10-8-ST-ADAPT-AS |
| AT-1319-10-8-ST-ADAPT-AS | 制造商:TE Connectivity 功能描述:AD-1319-10 |
| AT-1319-11-12-ST-ADP-A | 制造商:TE Connectivity 功能描述:AT-1319-11-12-ST-ADP-ASY |
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