Diodes AP8800 Manuel d'utilisateur télécharger pdf

AP8800

Document number: DS31764 Rev. 7 - 2

1 of 13

www.diodes.com

August 2012

P8800

350mA LED STEP-DOWN CONVERTER

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

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 U-DFN3030-10: 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)

Applications

• Commercial & Industrial Lighting

• Small LCD Panel Backlight

• Architecture Detail Lighting

• Appliances Interior Lighting

Pin Assignments

SO-8

( Top View )

RSVD

GND

CTRL

SET

AP8800

MSOP-8

( Top View )

RSVD

GND

CTRL

SET

AP8800

U-DFN3030-10

( Top View )

GND

RSVD

CTRL

SET

AP8800

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 Applications Circuit

1 2 3 4 5 6 ... 12 13

Résumé du contenu

Page 1 - U-DFN3030-10

AP8800 Document number: DS31764 Rev. 7 - 2 1 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800350mA LED STEP-DOWN CONVERTER Descriptio

AP8800 Document number: DS31764 Rev. 7 - 2 10 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Package Outline Dimensions (All dimens

Page 3

AP8800 Document number: DS31764 Rev. 7 - 2 11 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Suggested Pad Layout Please see AP020

Page 4 - Application Information

AP8800 Document number: DS31764 Rev. 7 - 2 12 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Tape Orientation (Note 6) For U-DFN30

Page 5 - Switching Frequency

AP8800 Document number: DS31764 Rev. 7 - 2 13 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 IMPORTANT NOTICE DIODES INCORPORATED

Page 6 - Analog Dimming

AP8800 Document number: DS31764 Rev. 7 - 2 2 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Pin Descriptions Pin Name Pin Number F

Page 7 - Soft-Start

AP8800 Document number: DS31764 Rev. 7 - 2 3 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Recommended Operating Conditions (@TA =

Page 8 - DFN3030-10

AP8800 Document number: DS31764 Rev. 7 - 2 4 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Application Information AP8800 Operati

Page 9 - AP 8800 XX G - X

AP8800 Document number: DS31764 Rev. 7 - 2 5 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Application Information (cont.) Induct

Page 10 - Package Type: U-DFN3030-10

AP8800 Document number: DS31764 Rev. 7 - 2 6 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Application Information (cont.) LED Cu

Page 11 - Suggested Pad Layout

AP8800 Document number: DS31764 Rev. 7 - 2 7 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Application Information (cont.) PWM D

Page 12 - For U-DFN3030-10

AP8800 Document number: DS31764 Rev. 7 - 2 8 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Application Information (cont.) Fault

Page 13 - LIFE SUPPORT

AP8800 Document number: DS31764 Rev. 7 - 2 9 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800 Ordering Information AP 8800 XX G -

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