
AP8800
350mA LED STEP-DOWN CONVERTER
AP8800
Document number: DS31764 Rev. 5 - 2
1 of 11
March 2011 Diodes Incorporated
Description
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 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 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
SO-8, MSOP-8 and DFN3030-10 are available in
“Green” Molding Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
Note: 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.
Applications
Commercial & Industrial lighting
Small LCD panel backlight
Architecture Detail lighting
Appliances interior lighting
Pin Assignments
SO-8
1
2
3
4
5
6
7
8
( Top View )
RSVD
SW
GND
NC
NC
V
IN
CTRL
SET
AP8800
MSOP-8
1
2
3
4
5
6
7
8
( Top View )
RSVD
SW
GND
NC
NC
V
IN
CTRL
SET
AP8800
DFN3030-10
( Top View )
1
2
5
3
6
8
7
10
9
GND
RSVD
NC
CTRL
SW
NC
V
IN
NC
SET
NC
AP8800
4
Typical Application Circuit
Fig. 1 Typical Application Circuit