Diodes AL8808 Instrukcja Użytkownika

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AL8808
Document number: DS35648 Rev. 2 - 2
1 of 20
www.diodes.com
January 2013
© Diodes Incorporated
NEW PRODUCT
A
L8808
COST EFFECTIVE LOW EMI 30V 1A BUCK LED DRIVER
Description
The AL8808 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 8 LEDs,
depending on the forward voltage of the LEDs, in series from a
voltage source of 6V to 30V. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AL8808 switches at frequency up to
1MHz with controlled rise and fall times to reduce EMI. This allows
the use of small size external components, hence minimizing the PCB
area needed.
Maximum output current of AL8808 is set via an external resistor
connected between the V
IN
and SET input pins. Dimming is achieved
by applying either an analog DC voltage or a PWM signal at the
CTRL input pin. An input voltage of 0.4V or lower at CTRL switches
off the output MOSFET simplifying PWM dimming.
Applications
MR16 Lamps
General Illumination Lamps
Pin Assignments
Features
LED Driving Current Up to 1A
Better Than 5% Accuracy
High Efficiency Up to 96%
Fast Controlled Falling Edges 7ns
Operating Input Voltage from 6V to 30V
High Switching Frequency Up to 1MHz
PWM/DC Input for Dimming Control
Built-In Output Open-Circuit Protection
Built-In Over-Temperature Protection
TSOT25: Available in “Green” Molding Compound (No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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
TSOT25
(Top View)
1
2
3
5
4
V
IN
SET
SW
GND
CTRL
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Podsumowanie treści

Strona 1 - © Diodes Incorporated

AL8808 Document number: DS35648 Rev. 2 - 2 1 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808COST EFFECTIVE LOW EMI 30V 1A

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AL8808 Document number: DS35648 Rev. 2 - 2 10 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Application Information (co

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NEW PRODUCT AL8808 Document number Applicatio PWM DimminThe CTRL pin isoutput stage. The ultimate PWlower switching the accuracy/line At the start

Strona 4 - L = 33µH, L = 68µH, L = 100µH

NEW PRODUCT AL8808 Document number Applicatio Start-up and SOn initial power than 0.45V (typithe output startsThis will cause sthe upper LED c The A

Strona 5

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AL8808 Document number: DS35648 Rev. 2 - 2 14 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Application Information (c

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AL8808 Document number: DS35648 Rev. 2 - 2 15 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Application Information (c

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NEW PRODUCT AL8808 Document number Applicatio EMI and LayoThe AL8808 is decoupling and switching speeddue to switching The turn-on edgand PCB track

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AL8808 Document number: DS35648 Rev. 2 - 2 17 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Application Information (c

Strona 10 - PWM Dimming

NEW PRODUCT AL8808 Document number Applicatio Fault ConditioThe AL8808 hasVIN and the SW If the LEDs shouthe expected cudramatically andLEDs. T

Strona 11 - © Diodes Incorporat

AL8808 Document number: DS35648 Rev. 2 - 2 19 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Ordering Information Pa

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NEW PRODUCT AL8808 Document number Pin Descri Pin Number 1 2 3 4 5 Functiona Absolute M Symbol ESD HBM ESD MM VIN VSET VSW VCTRL ISW TJ TLEAD TS

Strona 13 - Inductor Sel

AL8808 Document number: DS35648 Rev. 2 - 2 20 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Suggested Pad Layout Please

Strona 14 - Diode Selection

AL8808 Document number: DS35648 Rev. 2 - 2 3 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Recommended Operating Condi

Strona 15 - Thermal Considerations

AL8808 Document number: DS35648 Rev. 2 - 2 4 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Typical Performance Charac

Strona 16 - Document numbe

NEW PRODUCT AL8808 Document number Typical Pe SW MOSFET R (m )DS(ON)Ω6050403020100.500.450.400.350.300.250.200.150.000.050.10SW MOSFET R ( )DS(ON)

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AL8808 Document number: DS35648 Rev. 2 - 2 6 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Typical Performance Charact

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AL8808 Document number: DS35648 Rev. 2 - 2 7 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Typical Performance Charact

Strona 19 - PackingPackage

AL8808 Document number: DS35648 Rev. 2 - 2 8 of 20 www.diodes.com January 2013© Diodes Incorporated NEW PRODUCT AL8808 Typical Performance Charac

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NEW PRODUCT AL8808 Document number Applicatio AL8808 OperaIn normal operainductor L1, andvoltage and the This rising currevoltage to the inWhen this

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