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PDF ACS0804 Data sheet ( Hoja de datos )
| Número de pieza | ACS0804 | |
| Descripción | Compact Direct AC Line LED Driver | |
| Fabricantes | Altoran | |
| Logotipo |  |
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ACS0804
Altoran Chip & Systems
ACS0804
Compact Direct AC Line LED Driver with high PF and low THD
using Only Two External Components
FEATURES
Direct AC Line LED Driver with Only Two
External Components
Wide AC Input Range : 90~280VAC
Compact LED Driver Module Size due to
Minimal Number of External Components
Integrated 4 High Voltage Constant Current
Sinks
TRIAC Dimmable (Leading/Trailing Edge)
Rheostat Dimmable
High Power Factor (above 0.99 in normal
configuration)
High Efficiency Greater than 90% in Optimized
LED Configuration
Adjustable LED Power with an External
Resistor
Low Harmonic Content (THD under 15% in
normal configuration)
Low Crest Factor (under 1.5 in normal LED
configuration)
LED Current Sinking Capability of up to
75mArms
Compact SOIC 8LD Package (Other types
available upon request)
Flexible LED Forward Voltage, VF,
Configuration
Multiple LED Driver Configuration
Over Temperature Protection
DESCRIPTION
The ACS0804 is a direct AC line LED driver with a
minimal number of external components. In normal
configuration, only two components are used. One
resistor is to provide adjustable LED power and one
capacitor is to provide a stable voltage to the internal
shunt regulator.
The ACS0804 can be used with different types of
TRIAC dimming control switches. Since the ACS0804
drives all LED current sink outputs based on the AC
line level, whether the AC mains are controlled by a
leading edge dimmer, a trailing edge dimmer or a AC
level dimmer, the LED current closely follows the AC
line and is perfectly in phase. It achieves the highest
efficiency with high PF and low THD and makes the
ACS0804 suitable for high-efficiency LED lighting sys-
tems. The ACS0804 can also be used with a rheostat
dimmer switch which is suitable for desktop or indoor
lamps.
Multiple ACS0804 drivers can be used together for
over 10W LED lighting applications such as street
lights, down lights, candle lights, and etc.
The ACS0804 includes over temperature protection by
default. When the driver's junction temperature ex-
ceeds a specified thermal threshold(TJ=170°C), LEDs
will shut down automatically and then recover auto-
matically once the temperature drops below the ther-
mal threshold. If this protection is not necessary to be
adopted, the over temperature protection can be disa-
bled by an internal programming. But without this pro-
tection, the lifetime of the ACS0804 can be reduced
and irreparable damage can occur when it operates
above its maximum junction temperature range(TJ-
MAX=150°C).
APPLICATIONS
Direct AC Line LED Lighting Applications up to
10W.
General solid state lighting.
Small size LED lighting – Candle light, and etc.
ACS0804 Datasheet Rev2.0
1
Free Datasheet http://www.0PDF.com
1 page  
ACS0804
Altoran Chip & Systems
PIN FUNCTIONS
VIN: Rectified AC Input Voltage. Connect this pin to
rectified AC voltage after a bridge rectifier.
VDD: Output Voltage. This pin supplies current to
internal circuitry. A 17.4V shunt regulator is internally
connected to this pin. A bypassing capacitor is
recommended to be added to reduce noise from VIN.
RISET: Controls LED Current for each LED group.
Refer to resistor setting equation to decide proper
resistor value.
LED1-4: LED Channel Output. Connect the bottom
cathodes of LED groups to these pins. Tie the pin(s) to
GND if the corresponding string is not used.
GND: Ground. Tie this pin directly to local ground
plane. This ground should not be tied to earth ground
since it is non-isolated from AC mains.
EP: Exposed thermal pad. In package, EP is tied to
GND inside IC.
BLOCK DIAGRAM
Figure 4. Block diagram of ACS0804
ACS0804 Datasheet Rev2.0
5
Free Datasheet http://www.0PDF.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ACS0804.PDF ] | |
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