Diodes AP8802 - Manual

AP8802
1A LED STEP-DOWN CONVERTER
AP8802
Document number: DS31766 Rev. 9 - 2
1 of 19
www.diodes.com
May 2012
© Diodes Incorporated
Description
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
frequencies up to 700kHz. 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 V
IN
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.
Features
•
LED driving current up to 1A
•
High efficiency up to 92%
• Operating input voltage up to 48V
• High switching frequency up to 700kHz
•
PWM/DC input for dimming control
•
Built-in output open-circuit protection
•
SO-8, SO-8EP and U-DFN3030-10 are available in “Green”
Molding Compound (No Br, Sb)
•
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
•
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
CTRL
GND
SW
(Top View)
SO-8
AP8802
SET
GND
NC
V
IN
SW
2
3
4
8
7
6
5
CTRL
GND
SW
(Top View)
SO-8EP
AP8802
SET
GND
NC
V
IN
SW
2
3
4
8
7
6
5
AP8802
U-DFN3030-10
(Top View)
SET
GND
NC
V
IN
NC
CTRL
GND
NC
SW
SW
10
9
8
7
6
1
2
3
4
5
Applications
• Commercial & industrial lighting
• Small LCD panel backlight
•
Appliances interior lighting
•
Architecture Detail lighting
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Application Circuit