Diodes AP8800A User Manual
Ap8800a, Description, Features
AP8800A
Document number: DS35100 Rev. 3 - 2
1 of 13
August 2012
© Diodes Incorporated
AP8800A
COST EFFECTIVE 28V BUCK 1-W LED DRIVER
Description
The AP8800A is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to 7 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 eliminating
the need for ballast resistors. The AP8800A switches at frequency up
to 600kHz. This allows the use of small size external components,
hence minimizing the PCB area needed.
Maximum output current of AP8800A 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 switches off the output
MOSFET simplifying PWM dimming.
Features
• LED driving current up to 370mA
• Better than 5% accuracy
• High efficiency up to 95%
• Operating input voltage from 8V to 28V
• Simple, versatile solution requiring only 4 components
• PWM/DC input for dimming control
• Built-in output open-circuit protection
• TSOT25: Available in “Green” Molding Compound (No Br, Sb)
with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
4
SET
5
V
IN
SW
1
CTRL
3
GND
2
(Top View)
Applications
• MR16
Lamps
•
General Illumination Lamps
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. Se 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 Applications Circuit