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PDF AP8802 Data sheet ( Hoja de datos )
| Número de pieza | AP8802 | |
| Descripción | 1A LED Step-Down Converter | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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AP8802www.DataSheet4U.com
1A LED Step-Down Converter
Features
General Description
• LED driving current up to 1A
• High efficiency up to 92%
• Operating input voltage up to 48V
• High switching frequency up to 500kHz
• PWM/DC input for dimming control
• Built-in output open-circuit protection
• SOP-8L, SOP-8L-EP (Preview) and DFN3030-10 are
available in “Green” Molding Compound (No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
The AP8802 is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to thirteen
LEDs, depending on the forward voltage of the LEDs, in series
from a voltage source of 8V to 48V. Series connection of the
LEDs provides identical LED currents resulting in uniform
brightness and eliminating the need for ballast resistors. The
AP8802 switches at frequency up to 500kHz. This allows the
use of small size external components, hence minimizing the
PCB area needed.
Maximum output current of AP8802 is set via an external resistor
connected between the VIN and SET input pins. Dimming is
achieved by applying either a DC voltage or a PWM signal at the
CTRL input pin. An input voltage of 0.2V or lower at CTRL shuts
down the output at SW and puts the device into a low-current
standby state.
Applications
• Commercial & industrial lighting
• Small LCD panel backlight
• Appliances interior lighting
• Architecture Detail lighting
Ordering Information
AP 8802 XX G - X
Package
S : SOP-8L
SP : SOP-8L-EP (Preview)
FN : DFN3030-10
Green
G : Green
Packing
7/ 13 : Tape & Reel
Device
AP8802SG-13
AP8802SPG-13
AP8802FNG-7
Package
Code
S
SP
FN
Packaging
(Note 2)
SOP-8L
SOP-8L-EP
DFN3030-10
7”/13” Tape and Reel
Quantity
Part Number Suffix
2500/Tape & Reel
-13
2500/Tape & Reel
-13
3000/Tape & Reel
-7
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AP8802 Rev. 1
1 of 13
www.diodes.com
MARCH 2009
© Diodes Incorporated
1 page  
AP8802www.DataSheet4U.com
1A LED Step-Down Converter
Application Information
LED Current Control
The LED current is controlled by the resistor RSET in Figure 2.
Connected between VIN and SET the nominal average output current in the LED(s) is defined as:
ILED
= VTHD
RSET
If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:
ILED
= VCTRL
VREF
VTHD
RSET
LEDcurrent Versus RSET and VCTRL
1200
1000 0.2 0.39
0.47
800
0.56
600
400
200
0
0
0.33 0.68
0.2 0.39
0.47
0.82
0.56
0.33
0.68
0.82
0.47
0.68 0.82
1
1
1
1.2
1.2
1.2
1.5
1.5
1.5
2
2
2
0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1
33
3
2.25 2.4 2.55 2.7 2.85 3
RSET value [Ohms]
Figure 3: LED Current setting Vs RSET and VCTRL
LED current @
VCTRL = 1.25V
LED current @
VCTRL = 2.5V
LED current @
VCTRL = 0.625V
AP8802 Rev. 1
5 of 13
www.diodes.com
MARCH 2009
© Diodes Incorporated
5 Page 
Package Information (All Dimensions in mm)
(1) Package Type: SOP-8L
AP8802www.DataSheet4U.com
1A LED Step-Down Converter
7°~9°
1.27typ
0.3/0.5
4.85/4.95
0.62/0.82
Detail "A"
Gauge Plane
Seating Plane
0.35max. 45°
7°~9°
Detail "A"
0°/8°
8x-0.60
6x-1.27
Land Pattern Recommendation
(Unit: mm)
(2) Package Type: SOP-8L-EP (Preview)
Detail "A" 0°/8°
7°~9°
Exposed pad
45°
7°~9° 1
1.27typ
0.3/0.5
4.85/4.95
1
8x-0.60
0.15/0.25
1
3.3Ref.
Bottom View
0.62/0.82
Detail "A"
Gauge Plane
Seating Plane
Exposed pad
6x-1.27
Land Pattem Recommendation
(Unit:mm)
AP8802 Rev. 1
11 of 13
www.diodes.com
MARCH 2009
© Diodes Incorporated
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP8802.PDF ] | |
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