AT9919 Supertex, Inc., AT9919 Datasheet

AT9919

Manufacturer Part Number

AT9919

Description

Manufacturer

Supertex, Inc.

Datasheet

1.AT9919.pdf (7 pages)

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Download datasheet (652Kb)

Features

Applications

Typical Application Circuit

Supertex inc.

►

Hysteretic control with high-side current sensing

Wide input voltage range: 4.5 to 40V

>90% Efficiency

Typical ±5% LED current accuracy

Up to 2.0MHz switching frequency

Adjustable constant LED current

Analog or PWM control signal for PWM dimming

Over-temperature protection

-40ºC to +125ºC operating temperature range

AEC-Q100 compliant

Automotive LED lighting applications

0 - 2.0V

Supertex inc.

Hysteretic, Buck, High Brightness LED Driver

with High-Side Current Sensing

1235 Bordeaux Drive, Sunnyvale, CA 94089

RAMP

ADIM

DIM

AT9919

VIN

SENSE

GATE

GND

VDD

General Description

The AT9919 is a PWM controller IC designed to drive high

brightness LEDs using a buck topology. It operates from an

input voltage of 4.5 to 40VDC and employs hysteretic control

with a high-side current sense resistor to set the constant

output current.

The operating frequency range can be set by selecting the

proper inductor. Operation at high switching frequency is

possible since the hysteretic control maintains accuracy even

at high frequencies. This permits the use of small inductors

and capacitors minimizing space and cost in the overall

system.

LED brightness control is achieved with PWM dimming from

an analog or PWM input signal. Unique PWM circuitry allows

true constant color with a high dimming range. The dimming

frequency is programmed using a single external capacitor.

The AT9919 comes in a small, 8-Lead DFN package and is

qualified for automotive LED lighting applications.

Tel: 408-222-8888

www.supertex.com

AT9919

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