Diodes AP8803 Instrukcja Użytkownika Pobierz pdf

AP8803

Document number: DS31970 Rev. 5 - 2

1 of 10

www.diodes.com

August 2012

P8803

30V 1A BUCK LED DRIVER

Description

The AP8803 is a step-down DC/DC converter designed to drive LEDs

with a constant current. The device can drive up to 7 LEDs,

depending on the forward voltage of the LEDs, in series from a

voltage source of 8V to 30V. Series connection of the LEDs provides

identical LED currents resulting in uniform brightness and eliminating

the need for ballast resistors. The AP8803 switches at frequency up

to 700kHz. This allows the use of small size external components,

hence minimizing the PCB area needed.

Maximum output current of AP8803 is set via an external resistor

connected between the V

and SET input pins. Dimming is achieved

by applying either a DC voltage or a PWM signal at the CTRL input

pin. An input voltage of 0.2V or lower at CTRL shuts down the output

at SW and puts the device into a low-current standby state.

Features

• LED Driving Current up to 1A

• High Efficiency Up to 92%

• Operating Input Voltage Up to 30V

• High Switching Frequency Up to 700kHz

• PWM/DC Input for Dimming Control

• Built-In Output Open-Circuit Protection

• TSOT25: Available in “Green” Molding Compound (No Br, Sb)

with lead Free Finish/ RoHS Compliant

 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

 Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

SET

CTRL

GND

Top View

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

SET

AP8803

CTRL

SET

GND

12V_DC

1 2 3 4 5 6 7 8 9 10

Podsumowanie treści

Strona 1 - 30V 1A BUCK LED DRIVER

AP8803 Document number: DS31970 Rev. 5 - 2 1 of 10 www.diodes.com August 2012© Diodes Incorporated AP880330V 1A BUCK LED DRIVER Description The AP

Strona 2

AP8803 Document number: DS31970 Rev. 5 - 2 10 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Suggested Pad Layout Please see AP0200

Strona 3

AP8803 Document number: DS31970 Rev. 5 - 2 2 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Pin Descriptions Pin Name Function SW

Strona 4 - Application Information

AP8803 Document number: DS31970 Rev. 5 - 2 3 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Recommended Operating Conditions (@TA =

Strona 5 - Switching Frequency @ I

AP8803 Document number: DS31970 Rev. 5 - 2 4 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Application Information AP8803 Operation

Strona 6

AP8803 Document number: DS31970 Rev. 5 - 2 5 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Application Information (cont.) Induct

Strona 7 - Soft-Start

AP8803 Document number: DS31970 Rev. 5 - 2 6 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Application Information (cont.) LED Cur

Strona 8 - Power dissipation (W)

AP8803 Document number: DS31970 Rev. 5 - 2 7 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Application Information (cont.) PWM Dimm

Strona 9

AP8803 Document number: DS31970 Rev. 5 - 2 8 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Application Information (cont.) Fault C

AP8803 Document number: DS31970 Rev. 5 - 2 9 of 10 www.diodes.com August 2012© Diodes Incorporated AP8803 Ordering Information Part Number Pack

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Podsumowanie treści

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