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PDF AP8800 Data sheet ( Hoja de datos )
| Número de pieza | AP8800 | |
| Descripción | 350mA LED Step-Down Converter | |
| Fabricantes | Diodes Incorporated | |
| Logotipo |  |
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AP8800www.DataSheet4U.com
350mA LED Step-Down Converter
Features
General Description
• LED driving current up to 350mA
• Compatible with 12V & 24V standard systems
• High efficiency up to 92%
• High switching frequency up to 0.6MHz
• PWM/DC input for dimming control
• Built-in soft-start function
• Built-in output open-circuit protection
• SOP-8L, MSOP-8L and DFN3030-10 are available in
“Green” Molding Compound (No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
The AP8800 is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to seven
LEDs, depending on the forward voltage of the LEDs, in series
from a voltage source of 8V to 28V. Series connection of the
LEDs provides identical LED currents resulting in uniform
brightness and eliminates the need for ballast resistors. The
AP8800 switches at frequency up to 0.6MHz. This allows the
use of small size external components, hence minimizing the
PCB area needed.
Maximum output current of AP8800 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
• Architecture Detail lighting
• Appliances interior lighting
Ordering Information
AP 8800 XX G - X
Package
S : SOP-8L
M8 : MSOP-8L
FN : DFN3030-10
Green
G : Green
Packing
7/ 13 : Tape & Reel
Device
AP8800SG-13
AP8800M8G-13
AP8800FNG-7
Package
Code
S
M8
FN
Packaging
(Note 2)
SOP-8L
MSOP-8L
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. Please visit our website at
http://www.diodes.com/products/lead_free.html.
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.
AP8800 Rev. 1
1 of 11
www.diodes.com
MARCH 2009
© Diodes Incorporated
1 page  
AP8800www.DataSheet4U.com
350mA LED Step-Down Converter
Application Information
LED Current Control
The LED current is controlled by the resistor RSET in Figure 1.
If the CTRL pin is floating and at a nominal voltage of VREF, the external current sense resistor RSET
(greater than 0.3 Ω) is connected between VIN and SET and defines the nominal average output current in
the LED(s) as:
ILED
=
VTHD
RSET
If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current in this case is:
ILED
= VCTRL
VREF
VTHD
RSET
The graph in figure 2 gives values of nominal average output current for several values of current setting
resistor (RSET) in the typical application circuit shown on Figure 1, for different voltages applied on the CTRL
pin.
LED current Versus RSET and VCTRL
400
350 0.56
0.3
300
250
200
150
100
50
0
0
0.33 0.68
0.39
0.75
0.82
0.47
0.56
0.3 0.68
0.39 0.82
0.47
0.56
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 2.25 2.4 2.55 2.7 2.85
3
3
3
3
RSET value [Ohms]
Figure 2: LED Current setting Vs RSET and VCTRL
LED current @
VCTRL = 1.25V
LED current @
VCTRL = 2.5V
LED current @
VCTRL = 0.625V
AP8800 Rev. 1
5 of 11
www.diodes.com
MARCH 2009
© Diodes Incorporated
5 Page 
Taping Orientation
For DFN3030-10
AP8800www.DataSheet4U.com
350mA LED Step-Down Converter
Notes: 5. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf.
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
AP8800 Rev. 1
11 of 11
www.diodes.com
MARCH 2009
© Diodes Incorporated
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AP8800.PDF ] | |
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