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PDF AX9380 Data sheet ( Hoja de datos )
| Número de pieza | AX9380 | |
| Descripción | Universal High Brightness Led Driver | |
| Fabricantes | AXElite | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AX9380 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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AX9380 (Preliminary)
Universal High Brightness Led Driver
GENERAL DESCRIPTION
The AX9380 is an average current mode control high brightness LED driver IC with
active power factor correction function.
The line and load compensations are applied in the AX9380 to improve the output
current regulation. The LED current accuracy is ±5%.
The AX9380 includes a special circuit, is able to reduce AC input current distortion that
allows universal operation with an extremely high PF. The AX9380 is ideally suited for buck
LED drivers. The IC operates in a constant off-time mode. The AX9380 also provides
system output short circuit protection.
FEATURES
- Universal Rectified 90VAC to 264VAC Input Voltage Range
- Built-in Active Power Factor Correction Technique
- Constant Current Control LED Driver
- High Efficiency Application
- Built-in Output Short Circuit Protection
- Constant Off-Time
- No External Loop Compensation Components Required
- Very Tight Line and Load Regulation
- Available in the 8-Pin Pb-Free SOP Package
BLOCK DIAGRAM
1/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jan.17, 2012
1 page  
AX9380 (Preliminary)
(2) Output Short Circuit Protection
Output short circuit protection is implemented to protect the chip from operating at
short circuit conditions. When output load short circuit happens, the inductor current will be
over stored; it will be detected by RCS and feed forward to control circuit.
If the voltage at the CS pin reaches higher than 1V within a 2us, the hiccup protection
mode will be triggered. If the short circuit condition has not been cleared, the AX9380 will
remain hiccup mode until the short is cleared. Thus, it reduces the input power consumption
and protects power components.
(3) Off-Time Auto-Extension
The duty cycle of buck converter can be calculated as D=Vo/Vin. As a result, the
higher input voltage, the smaller duty cycle. If off-time is fixed, on-time is inversely
proportional to the input voltage, and frequency is proportional to the input voltage.
In order to avoid over-high operating frequency at high input voltage, the controller is
specially designed to extend the fixed off-time automatically at high input voltage to lower
operating frequency.
Off-Time Setting
AX9380 offers an off-time setting function via connect a resistor from RT to GND. A
maximum 150 KHz switching frequency is set by the AX9380 to ensure better EMI
performance, normally 30~45 KHz are recommended. Furthermore, due to the difference of
the off-time at high line and low line voltage conditions. The line input voltage variation
needs to be taken into account in design. The relationship between off-time setting and
operating frequency is regulated as:
Switching
period: T
toff
1 D
Duty cycle: D VLED
VIN
D min VLED
VIN (PK )
Operating frequency:
f 1
T
Minimum
switching
period: Tmin
Toff
1 Dmin
Maximum operating frequency:
1
fmax Tmin
When input voltage is 115VAC,
1
f Tmax(115Vac)
min(115Vac )
When input voltage is 230VAC,
1
f Tmax(230Vac)
min( 230Vac )
5/10
Axelite Confidential Materials, do not copy or distribute without written consent.
Rev.1.0 Jan.17, 2012
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX9380.PDF ] | |
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