Diodes AP5726 Uživatelský manuál stáhnout pdf

AP5726

WHITE LED STEP-UP CONVERTER

AP5726

Document number: DS31845 Rev. 3 - 2

1 of 17

www.diodes.com

July 2010

Description

The AP5726 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,

AP5726 also supports a single feedback of parallel

connected multiple strings of equal number of LEDs.

The AP5726 switches at 1.2MHz that allows the use of tiny

external components. A low 0.31V feedback voltage

minimizes power loss in the current setting resistor for better

efficiency.

Pin Assignments

OVP

(Top View)

VIN

GND

SOT26 / TSOT23-6

OVP

GND

(Top View)

DFN2020C-6

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, TSOT23-6 and DFN2020C-6: Available in

“Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Applications

• Cellular Phones

• PDAs, Hand help Computers

• Digital Cameras

• MP3 Players

• GPS Receivers

Notes: 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.

Typical Application Circuit

GND

AP5726

OUT

1uF

SET

22uH

1uF

OVP

2~6 LEDs

PWM Dimming

OFFON

Figure 1. Typical Application Circuit

1 2 3 4 5 6 ... 16 17

Shrnutí obsahu

Strany 1 - 2~6 LEDs

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 1 of 17 www.diodes.com July 2010 © Diodes Incorporated Description T

Strany 2 - Functional Block Diagram

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 10 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Strany 3

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 11 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Strany 4 - Electrical Characteristics (V

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 12 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Strany 5 - Feedback Voltage(V)

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 13 of 17 www.diodes.com July 2010 © Diodes Incorporated Ordering Info

Strany 6 - = 3.6V

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 14 of 17 www.diodes.com July 2010 © Diodes Incorporated Package Outli

Strany 7 - 4 LEDs ; L = 22uH

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 15 of 17 www.diodes.com July 2010 © Diodes Incorporated Package Outli

Strany 8

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 16 of 17 www.diodes.com July 2010 © Diodes Incorporated Taping Orient

Strany 9 - 9 of 17

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 17 of 17 www.diodes.com July 2010 © Diodes Incorporated IMPORTANT NOT

Strany 10 - July 2010

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 2 of 17 www.diodes.com July 2010 © Diodes Incorporated Pin Descriptio

Strany 11 - WHITE LED STEP-UP CONVERTER

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 3 of 17 www.diodes.com July 2010 © Diodes Incorporated Absolute Maxim

Strany 12 - 12 of 17

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 4 of 17 www.diodes.com July 2010 © Diodes Incorporated Electrical Cha

Strany 13 - ( Top View )

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 5 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Strany 14

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 6 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Strany 15 - (Continued)

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 7 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 8 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Strany 17

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 9 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications I

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