Diodes AP8802 Uživatelský manuál stáhnout pdf

AP8802

1A LED STEP-DOWN CONVERTER

AP8802

Document number: DS31766 Rev. 9 - 2

1 of 19

www.diodes.com

May 2012

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

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

(Top View)

SO-8

AP8802

SET

GND

CTRL

GND

(Top View)

SO-8EP

AP8802

SET

GND

AP8802

U-DFN3030-10

(Top View)

SET

GND

CTRL

GND

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 ... 18 19

Shrnutí obsahu

Strany 1 - © Diodes Incorporated

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 1 of 19 www.diodes.com May 2012 © Diodes Incorporated Description The

Strany 2 - Functional Block Diagram

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 10 of 19 www.diodes.com May 2012 © Diodes Incorporated Application In

Strany 3 - = +25°C)

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 11 of 19 www.diodes.com May 2012 © Diodes Incorporated Application In

Strany 4 - Electrical Characteristics (T

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 12 of 19 www.diodes.com May 2012 © Diodes Incorporated Application In

Strany 5 - Typical Characteristics

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 13 of 19 www.diodes.com May 2012 © Diodes Incorporated Application In

Strany 6 - Typical Characteristics (T

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 14 of 19 www.diodes.com May 2012 © Diodes Incorporated Applications

Strany 7 - Application Information

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 15 of 19 www.diodes.com May 2012 © Diodes Incorporated Ordering Info

Strany 8

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 16 of 19 www.diodes.com May 2012 © Diodes Incorporated Marking Infor

Strany 9

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 17 of 19 www.diodes.com May 2012 © Diodes Incorporated Package Outli

Strany 10 - AP8802

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 18 of 19 www.diodes.com May 2012 © Diodes Incorporated Suggested Pad

Strany 11 - Directly Driving CTRL Input

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 19 of 19 www.diodes.com May 2012 © Diodes Incorporated IMPORTANT NO

Strany 12 - 1A LED STEP-DOWN CONVERTER

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 2 of 19 www.diodes.com May 2012 © Diodes Incorporated Pin Descriptio

Strany 13 - Package Selection

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 3 of 19 www.diodes.com May 2012 © Diodes Incorporated Absolute Maxim

Strany 14 - Fault Condition Operation

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 4 of 19 www.diodes.com May 2012 © Diodes Incorporated Electrical Cha

Strany 15 - (2) SO-8EP

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 5 of 19 www.diodes.com May 2012 © Diodes Incorporated Typical Charact

Strany 16 - (1) Package Type: SO-8

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 6 of 19 www.diodes.com May 2012 © Diodes Incorporated Typical Charact

Strany 17 - (2) Package Type: SO-8EP

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 7 of 19 www.diodes.com May 2012 © Diodes Incorporated Application In

Strany 18

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 8 of 19 www.diodes.com May 2012 © Diodes Incorporated Application In

Strany 19

AP88021A LED STEP-DOWN CONVERTER AP8802 Document number: DS31766 Rev. 9 - 2 9 of 19 www.diodes.com May 2012 © Diodes Incorporated Application Inf

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