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PDF AP8801 Data sheet ( Hoja de datos )
| Número de pieza | AP8801 | |
| Descripción | Step-down DC/DC Converter | |
| Fabricantes | Diodes | |
| Logotipo |  |
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Features
www.datasheet4u.com
• LED driving current up to 500mA
• Operating input voltage up to 48V
• High efficiency up to 92%
• High switching frequency up to 500kHz
• PWM/DC input for dimming control
• Built-in output open-circuit protection
• SOP-8L and MSOP-8L are available in “Green”
Molding Compound (No Br, Sb)
• Lead Free Finish/RoHS Compliant (Note 1)
Applications
• Commercial & industrial lighting
• Small LCD panel backlight
• Appliances interior lighting
• Architecture Detail lighting
Typical Application Circuit
AP8801
500mA LED Step-down Converter
General Description
The AP8801 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
AP8801 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 AP8801 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.
24V_DC
C1 = 2.2μF
CTRL
VIN
SET
AP8801
RSET = 0.43Ω
D1
GND
SW
L1 = 100μH
Figure 1: Typical Application Circuit
AP8801 Rev. 3
DS31765
1 of 11
www.diodes.com
MARCH 2009
© Diodes Incorporated
1 page  
AP8801
500mA LED Step-down Converter
Application Information
www.datasheet4u.com
LED Current Control
The LED current is controlled by the resistor RSET in Figure 1 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
LED current Versus RSET and VCTRL
600
500 0.4 0.82
400
300
200
100
0
0
0.47
0.56
1
0.47
0.68
0.82
1
0.68
0.82
1
1.2
1.2
1.2
1.5
1.5
1.5
2
2
2
3
3
3
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
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
AP8801 Rev. 3
DS31765
5 of 11
www.diodes.com
MARCH 2009
© Diodes Incorporated
5 Page 
AP8801
500mA LED Step-down Converter
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
www.datasheeIPtN4UCuRL.cPUoODmSINEG(,ANBUDTTHNEOITR
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
AND
FITNESS
FOR
A
PARTICULAR
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability
arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any
license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described
herein 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 Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales
channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and
markings noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the
express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in
the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to
cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning
their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any
devices- or systems-related information or support that may be provided by Diodes Incorporated. Further, Customers must fully
indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes Incorporated products in
such safety-critical, life support devices or systems.
Copyright © 2009, Diodes Incorporated
www.diodes.com
AP8801 Rev. 3
DS31765
11 of 11
www.diodes.com
MARCH 2009
© Diodes Incorporated
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| PDF Descargar | [ Datasheet AP8801.PDF ] | |
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