Diodes AP3154A Uživatelský manuál stáhnout pdf

AP3154A

120mA HIGH EFFICIENCY WHITE LED DRIVER

AP3154A Rev. 1 1 of 14 AUGUST 2009

www.diodes.com © Diodes Incorporated

• Up to 88% Max power efficiency

• Wide input voltage range: 2.7V ~ 5.5V

• 1x, 1.5x, and 2x charge-pump modes

• Drive up to 4 white LEDs

• Default maximum current setting: 20mA each channel

• 120mA maximum output current through 4 channels

• Programmable switching frequency, default 1.2MHz

• Spread Spectrum Control with 10% frequency deviation

• 1-wire Serial Digital Interface (SDI) or PWM for dimming

control

• Soft-start during power-up and mode switching

• Soft-stop during shutdown

• Short-circuit protection

• Over-voltage protection and under-voltage lockout

• Low shutdown current < 6

µA

• Industry-leading low profile package

• Lead Free package: DFN3030-12

• DFN3030-12: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish / RoHS Compliant (Note 1)

The AP3154A is a high efficiency charge-pump white LED driver

with 1x, 1.5x, 2x operating modes. The AP3154A operates on

power supplies from 2.7v to 5.5v. It drives up to four channels of

white LEDs while the intensity of each channel is configured by

varying the respective current levels. Each channel can supply up

to 30mA current. Up to four channels can be ganged together to

provide maximum load current of 120mA. By default, all

4 channels are set to the minimum current level after the chip is

enabled or back from shutdown mode.

The Serial Digital Interface (SDI) provides the capability to

configure the current for each LED channel. Some other key

features, such as Up Spread Spectrum Control, different

charge-pump switching frequencies (0.6MHz/1.2MHz/1.8MHz),

and PWM dimming control, can also be programmed through the

interface.

The AP3154A has a built-in soft-start circuit to minimize the inrush

current during power-up and mode switching. Various protections

such as short-circuit, over-voltage, under-voltage, and thermal

shutdown are integrated to ensure system reliability. The

quiescent current of AP3154A during shutdown is less than 6

µA.

• Mobile Phone

• PDA (Personal Digital Assistant)

• White LED Backlighting

• Camera Flash LED Lighting

• LCD Modules

• Portable Devices

Typical Application Circuit

1uF

AP3154A

OUT

GND

SDI

1uF

LED

1uF

OUT

Features

General Description

Applications

1 2 3 4 5 6 ... 13 14

Shrnutí obsahu

Strany 1 - Applications

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Strany 2 - Ordering Information

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Strany 3 - Block Diagram

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Strany 4

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Strany 5 - Electrical Characteristics

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Strany 6

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Strany 7

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Strany 8

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Strany 9 - Functional Description

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Strany 10 - Serial Digital Interface

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Strany 11 - Marking Information

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Strany 12 - Diodes Incorporated

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Strany 13 - Taping Orientation

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Strany 14

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