search

Diodes AL3157 Manuel d'utilisateur

Naviguer en ligne ou télécharger Manuel d'utilisateur pour Matériel Diodes AL3157. Diodes AL3157 User Manual [en] [es] [fr] Manuel d'utilisatio

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 9
  • Table des matières
  • MARQUE LIVRES
    • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 0
AL3157
HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER
FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT
AL3157
Document number: DS35116 Rev. 1 - 2
1 of 9
www.diodes.com
March 2011
© Diodes Incorporated
NEW PRODUCT
Description
The AL3157 is a low noise, constant frequency charge
pump DC/DC converter that uses a Dual mode load switch
(1x), and doubling (2x) conversion for driving white LEDs.
Low external part count (one 1µF flying capacitor and two
2.2µF capacitors at V
IN
and V
OUT
) make this part ideally
suited for small, battery-powered applications
The AL3157 drives 3 channels at up to 30mA for small
screen backlighting and an additional channel up to 210mA
for LED Flash or LED Flashlight – All from a 2.7V to 5.5V
input.
The AL3157 uses two control inputs (EN1/2) to
enable/disable it and PWM dim the LED current. EN2
controls/PWM dims the backlight LEDs at 30mA per
channel and EN1 controls/PWM dims the Flash/Flashlight
LEDs at 210mA.
Each output is equipped with built-in protection for V
OUT
short circuit and auto-disable for LED failure conditions.
Built-in soft-start circuitry prevents excessive in-rush
current during start-up and mode switching. A low-current
shutdown feature disconnects the load from V
IN
to reduce
quiescent current less than 1µA.
The AL3157 is available in a lead-free, space-saving
thermally enhanced 12-pin 3x3mm DFN package.
Pin Assignments
V
IN
V
OUT
C
N
D4
C
P
D1
D2
EN1
76
5
4
3
2
1
10
11
12
9
8
PGND
EN2
Exposed Pad
( Top View )
D3
GND
U-DFN3030-12
Features
• Dual-Mode 1x and 2x Charge Pump
• Up to 300mA drive capability
o 3-channel for backlight – 30mA/ch
o 1-channel for Flight/light – 210mA
• V
IN
Range: 2.7V to 5.5V
• Two simple PWM dimming control inputs up to
50kHz
• 1.2 MHz Constant Switching Frequency
• Built-In Thermal, Open-Circuit and V
OUT
short circuit
Protection
• Soft Start for reducing in-rush current
• I
Q
<1µA in Shutdown
• Thermally-Enhanced DFN3030-12 Package:
Available in “Green” Molding Compound (No Br, Sb)
• Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Smart Touch Phone LED Backlighting
• PDA White LED backlighting
• Backlighting + Torch light
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
AL3157
V
OUT
D1
D2
D3
D4
EN2
EN1
EN2
EN1
2.2µF
C
IN
V
IN
V
IN
1µF
C
1
C
P
C
N
5
3
6
12
10
8
7
1
11
4
PGND GND
29
2.2µF
C
OUT
Flash/
Light
(EN1)
Backlight
(EN2)
AL3157
V
OUT
D1
D2
D3
D4
EN2
EN1
EN2
EN1
2.2µF
C
IN
V
IN
V
IN
1µF
C
1
C
P
C
N
5
3
6
12
10
8
7
1
11
4
PGND GND
29
2.2µF
C
OUT
Flash/
Light
(EN1)
Backlight
(EN2)
Vue de la page 0
1 2 3 4 5 6 7 8 9

Résumé du contenu

Page 1 - ( Top View )

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 1 of 9 ww

Page 2 - Functional Block Diagram

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 2 of 9 ww

Page 3 - March 2011

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 3 of 9 ww

Page 4

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 4 of 9 ww

Page 5 - © Diodes Incorporated

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 5 of 9 ww

Page 6 - Functional Description

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 6 of 9 ww

Page 7 - AL3157 X - 7

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 7 of 9 ww

Page 8 - Tape Orientation (Note 8)

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 8 of 9 w

Page 9

AL3157HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT AL3157 Document number: DS35116 Rev. 1 - 2 9 of 9 w

Commentaires sur ces manuels

Pas de commentaire
Produits connexes et manuels pour Matériel Diodes AL3157
Matériel Diodes AL3158 Manuel d'utilisateur   (10 pages)
Matériel Diodes AL3159 Manuel d'utilisateur   (10 pages)
Matériel Diodes AP3156 Manuel d'utilisateur   (15 pages)
Matériel Diodes AP3154A Manuel d'utilisateur   (14 pages)
Matériel Diodes AP5724 Manuel d'utilisateur   (15 pages)
Matériel Diodes AP5725 Manuel d'utilisateur   (17 pages)
Matériel Diodes AP5727 Manuel d'utilisateur   (10 pages)
Matériel Diodes AP5726 Manuel d'utilisateur   (17 pages)
Matériel Diodes AL8806 Manuel d'utilisateur   (15 pages)
Matériel Diodes AL8806Q Manuel d'utilisateur   (13 pages)
Matériel Diodes AL8805 Manuel d'utilisateur   (16 pages)
Matériel Diodes AL8807 Manuel d'utilisateur   (20 pages)
Matériel Diodes AL8807A Manuel d'utilisateur   (20 pages)
Matériel Diodes AL8807Q Manuel d'utilisateur   (16 pages)
Matériel Diodes AL8807B Manuel d'utilisateur   (18 pages)
Matériel Diodes AL8811 Manuel d'utilisateur   (11 pages)
Matériel Diodes AL8812 Manuel d'utilisateur   (11 pages)
Matériel Diodes AL8808 Manuel d'utilisateur   (20 pages)
Matériel Diodes AP8800 Manuel d'utilisateur   (13 pages)
Matériel Diodes AP8800A Manuel d'utilisateur   (13 pages)
  • Küppersbusch Datatek Tiger TB Touch Arboria
  • Rolls Composants des dispositifs de sécurité Guardian Technologies Lampes de travail Avaya PC/postes de travail B&C Speakers Subwoofers pour voitures Breville Accessoires pour la préparation du café
  • Electrolux ESL9457RO Electrolux ERN29790 Bosch DWM 40 L Dell OptiPlex DCNE
  • Primare App Manuel de l'utilisateur ZyXEL 2-Slot Manuel de l'utilisateur HP Tango Manuel de l'utilisateur Brother MFC-260C Manuel de l'utilisateur Lumiscope 1095 Manuel de l'utilisateur