Diodes AP5724 Manuel d'utilisateur télécharger pdf

AP5724

Document number: DS31843 Rev. 4 - 2

1 of 15

www.diodes.com

December 2013

P5724

WHITE LED STEP-UP CONVERTER

Description

The AP5724 is a step-up DC/DC converter specifically designed to

drive white LEDs with a constant current. The device can drive 2 ~ 6

LEDs in series from a Li-Ion cell. Series connection of the LEDs

provides identical LED currents resulting in uniform brightness and

eliminates the need for ballast resistors. For driving higher number of

LEDs, AP5724 also supports a single feedback of parallel connected

multiple strings of equal number of LEDs.

The AP5724 switches at 1.2MHz that allows the use of tiny external

components. A low 0.1V feedback voltage minimizes power loss in

the current setting resistor for better efficiency

Features

• High Efficiency: 84% Typical

• Fast 1.2MHz Switching Frequency

• Current Limit and UVLO Protections

• Internal Thermal Shutdown

• Internal Over Voltage Protection

• Integrated Soft-Start Function

• SOT26, TSOT26 and U-DFN2020-6: Available in “Green”

Molding Compound (No Br, Sb)

• Lead-Free Finish; RoHS Compliant (Notes 1 & 2)

Pin Assignments

OVP

(Top View)

VIN

GND

SOT26 / TSOT23-6

OVP

GND

(Top View)

U-DFN2020-6

Applications

• Cellular Phones

• PDAs, Hand held Computers

• Digital Cameras

• MP3 Players

• GPS Receivers

Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

Typical Applications Circuit

GND

AP5724

OUT

1uF

SET

22uH

1uF

OVP

2~6 LEDs

PWM Dimming

OFFON

Figure 1 Typical Application Circuit

1 2 3 4 5 6 ... 14 15

Résumé du contenu

Page 1 - U-DFN2020-6

AP5724 Document number: DS31843 Rev. 4 - 2 1 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724WHITE LED STEP-UP CONVERTER Descriptio

Page 2

AP5724 Document number: DS31843 Rev. 4 - 2 10 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Applications Information (cont.) O

Page 3 - recommended pad layout

AP5724 Document number: DS31843 Rev. 4 - 2 11 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Ordering Information PackageAP 572

Page 4

AP5724 Document number: DS31843 Rev. 4 - 2 12 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Package Outline Dimensions (All dim

Page 5

AP5724 Document number: DS31843 Rev. 4 - 2 13 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Suggested Pad Layout Please see AP0

Page 6 - 4 LEDs ; L = 22uH

AP5724 Document number: DS31843 Rev. 4 - 2 14 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Tape Orientation For U-DFN2020-6

Page 7

AP5724 Document number: DS31843 Rev. 4 - 2 15 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 IMPORTANT NOTICE DIODES INCORPORATED

Page 8 - Applications Information

AP5724 Document number: DS31843 Rev. 4 - 2 2 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Pin Descriptions Pin Name Functions

Page 9

AP5724 Document number: DS31843 Rev. 4 - 2 3 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Recommended Operating Conditions (@

AP5724 Document number: DS31843 Rev. 4 - 2 4 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Typical Performance Characteristics

Page 11 - ( Top View )

AP5724 Document number: DS31843 Rev. 4 - 2 5 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Typical Performance Characteristics

Page 12 - (3) U-DFN2020-6 Type C

AP5724 Document number: DS31843 Rev. 4 - 2 6 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Typical Performance Characteristics

Page 13

AP5724 Document number: DS31843 Rev. 4 - 2 7 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Typical Performance Characteristics

Page 14 - For U-DFN2020-6

AP5724 Document number: DS31843 Rev. 4 - 2 8 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Applications Information Inductor Sel

Page 15

AP5724 Document number: DS31843 Rev. 4 - 2 9 of 15 www.diodes.com December 2013© Diodes Incorporated AP5724 Applications Information (cont.) Dim

Commentaires sur ces manuels

Pas de commentaire

Diodes AP5724 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Matériel Diodes AP5724. Diodes AP5724 User Manual [en] Manuel d'utilisatio

Résumé du contenu

Commentaires sur ces manuels

Produits connexes et manuels pour Matériel Diodes AP5724