Diodes AP8800A Uživatelský manuál stáhnout pdf

AP8800A

Document number: DS35100 Rev. 3 - 2

1 of 13

www.diodes.com

August 2012

P8800A

COST EFFECTIVE 28V BUCK 1-W LED DRIVER

Description

The AP8800A 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 28V. Series connection of the LEDs provides

identical LED currents resulting in uniform brightness and eliminating

the need for ballast resistors. The AP8800A switches at frequency up

to 600kHz. This allows the use of small size external components,

hence minimizing the PCB area needed.

Maximum output current of AP8800A 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 switches off the output

MOSFET simplifying PWM dimming.

Features

• LED driving current up to 370mA

• Better than 5% accuracy

• High efficiency up to 95%

• Operating input voltage from 8V to 28V

• Simple, versatile solution requiring only 4 components

• 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

4 SET

CTRL

GND

(Top View)

Applications

• MR16 Lamps

• General Illumination Lamps

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

1 2 3 4 5 6 ... 12 13

Shrnutí obsahu

Strany 1 - (Top View)

AP8800A Document number: DS35100 Rev. 3 - 2 1 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800ACOST EFFECTIVE 28V BUCK 1-W LED DRIVER

Strany 2

AP8800A Document number: DS35100 Rev. 3 - 2 10 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Application Information (cont.) (@TA

Strany 3

AP8800A Document number: DS35100 Rev. 3 - 2 11 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Application Information (cont.) (@TA

Strany 4 - Typical Characteristics

AP8800A Document number: DS35100 Rev. 3 - 2 12 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Ordering Information Part Number

Strany 5

AP8800A Document number: DS35100 Rev. 3 - 2 13 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Suggested Pad Layout Please see AP02

Strany 6 - Application Information (@T

AP8800A Document number: DS35100 Rev. 3 - 2 2 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Pin Descriptions Pin Name Pin Number

Strany 7

AP8800A Document number: DS35100 Rev. 3 - 2 3 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Recommended Operating Conditions (@TA

Strany 8

AP8800A Document number: DS35100 Rev. 3 - 2 4 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Typical Characteristics 010020030040

Strany 9

AP8800A Document number: DS35100 Rev. 3 - 2 5 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Typical Characteristics (cont.) -2-1

Strany 10 - Fault Conditions

AP8800A Document number: DS35100 Rev. 3 - 2 6 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Application Information (@TA = +25°C,

Strany 11

AP8800A Document number: DS35100 Rev. 3 - 2 7 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Application Information (cont.) (@TA =

Strany 12

AP8800A Document number: DS35100 Rev. 3 - 2 8 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Application Information (cont.) (@TA =

Strany 13

AP8800A Document number: DS35100 Rev. 3 - 2 9 of 13 www.diodes.com August 2012© Diodes Incorporated AP8800A Application Information (cont.) (@TA =

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