Diodes AP8801 User Manual download pdf

AP8801

500mA LED STEP-DOWN CONVERTER

AP8801

Document number: DS31765 Rev. 7 - 2

1 of 14

www.diodes.com

June 2012

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 700kHz. 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 V

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 500mA

• Operating input voltage up to 48V

• High efficiency up to 92%

• High switching frequency up to 700kHz

• PWM/DC input for dimming control

• Built-in output open-circuit protection

• SO-8 and MSOP-8 are 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



(Top View)

CTRL

SET

GND GND

AP8801

SO-8

(Top View)

CTRL

SET

GND GND

AP8801

MSOP-8

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

1 2 3 4 5 6 ... 13 14

Summary of Contents

Page 1 - AP8801

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 1 of 14 www.diodes.com June 2012 © Diodes Incorporated Description

Page 2

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 10 of 14 www.diodes.com June 2012 © Diodes Incorporated Applicati

Page 3 - Electrical Characteristics (T

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 11 of 14 www.diodes.com June 2012 © Diodes Incorporated Applicati

Page 4 - Typical Characteristics

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 12 of 14 www.diodes.com June 2012 © Diodes Incorporated Ordering

Page 5 - Typical Characteristics (T

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 13 of 14 www.diodes.com June 2012 © Diodes Incorporated Package

Page 6 - Application Information

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 14 of 14 www.diodes.com June 2012 © Diodes Incorporated IMPORTANT N

Page 7

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 2 of 14 www.diodes.com June 2012 © Diodes Incorporated Pin Descrip

Page 8

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 3 of 14 www.diodes.com June 2012 © Diodes Incorporated Recommended

Page 9 - Directly Driving CTRL Input

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 4 of 14 www.diodes.com June 2012 © Diodes Incorporated Typical Cha

Page 10

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Page 11 - 500mA LED STEP-DOWN CONVERTER

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 6 of 14 www.diodes.com June 2012 © Diodes Incorporated Application

Page 12 - (2) MSOP-8

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 7 of 14 www.diodes.com June 2012 © Diodes Incorporated Applicatio

Page 13 - (1) SO-8

AP8801500mA LED STEP-DOWN CONVERTER AP8801 Document number: DS31765 Rev. 7 - 2 8 of 14 www.diodes.com June 2012 © Diodes Incorporated Application

Page 14

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