Diodes AP5725 Manuel d'utilisateur

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AP5725
WHITE LED STEP-UP CONVERTER
AP5725
Document number: DS31844 Rev. 3 - 2
1 of 17
www.diodes.com
July 2010
© Diodes Incorporated
Description
The AP5725 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,
AP5725 also supports a single feedback of parallel
connected multiple strings of equal number of LEDs.
The AP5725 switches at 1.2MHz that allows the use of tiny
external components. A low 0.25V feedback voltage
minimizes power loss in the current setting resistor for better
efficiency.
Pin Assignments
1
2
3
7
4
6
OVP
FB
5
EN
SW
(Top View)
VIN
GND
SOT26 / TSOT23-6
SW
V
IN
OVP
1
2
3
6
5
4
GND
FB
EN
(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 held 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
V
IN
SW
EN
GND
FB
AP5725
C
OUT
1uF
R
SET
12
L1
22uH
D1
V
IN
C
IN
1uF
OVP
2~6 LEDs
PWM Dimming
OFFON
Figure 1. Typical Application Circuit
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Résumé du contenu

Page 1 - 2~6 LEDs

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 1 of 17 www.diodes.com July 2010 © Diodes Incorporated Description

Page 2 - Pin Descriptions

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 10 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Page 3

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 11 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Page 4 - Electrical Characteristics (V

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 12 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Page 5 - Feedback Voltage(V)

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 13 of 17 www.diodes.com July 2010 © Diodes Incorporated Ordering Inf

Page 6 - Temperature(

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 14 of 17 www.diodes.com July 2010 © Diodes Incorporated Package Outl

Page 7 - 4 LEDs ; L = 22uH

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Page 8

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Page 9 - 9 of 17

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 17 of 17 www.diodes.com July 2010 © Diodes Incorporated IMPORTANT NO

Page 10 - July 2010

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 2 of 17 www.diodes.com July 2010 © Diodes Incorporated Pin Descripti

Page 11 - WHITE LED STEP-UP CONVERTER

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Page 12

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Page 13 - ( Top View )

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 5 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfo

Page 14

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Page 15 - (Continued)

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Page 16 - © Diodes Incorporated

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Page 17

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 9 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

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