PPMIC BU

www.belling.com.cn

BL9582 Rev 1.2

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2/2010

©2010 Belling All Rights Reserved

1

BL9582

32V, 1.4A Step-down

High Brightness LED Driver with Internal Switch

FEATURES

Simple low parts count

Internal 32V NDMOS switch

Up to 1.4A output current

Single pin on/off and brightness control

using DC voltage or PWM

Soft Start

High efficiency (up to 97%)

Wide input voltage range: 6V to 32V

Output shutdown

Up to 1MHz switching frequency

Inherent open-circuit LED protection

Typical 4% output current accuracy

High-side current sense

Hysteretic control: no compensation

Adjustable constant LED current

Over temperature protection

Pb-free SOT89-5 packages

APPLICATIONS

Low voltage halogen replacement LEDs

Automotive lighting

Low voltage industrial lighting

LED back-up lighting

Illuminated signs

LCD TV backlighting

DESCRIPTION

The BL9582 is a continuous mode inductive

step-down converter, designed for driving

single or multiple series connected LEDs

efficiently from a voltage source higher than

the LED voltage. The device operates from

an input supply between 6V and 32V and

provides an externally output current up to

1.4A. Depending upon supply voltage and

external components, this can provides up to

24 watts of output power.

The BL9582 includes the output switch and a

high-side output current sensing circuit, which

uses an external resistor to set the nominal

average output current.

Output current can be adjusted by applying

an external control signal to the 'ADJ' pin.

The ADJ pin will accept either a DC voltage

or a PWM waveform. During DC dimming,

this will provide a continuous output current

that is proportional to the external applied DC

voltage. During the PWM dimming, this will

provide a gated output current and the

average current is proportional to the duty

cycle. Applying a voltage of 0.2V or lower to

the ADJ pin turns the output off and switches

the device into a low current standby state.

ORDERING INFORMATION

BL9582

X XXX

TYPICAL APPLICATION

LX

ADJ

GND

BL9582

N/C

GND

C1

4.7uF

Rs

0.1ohm

D1

L1

47uH

Package:

SRN: SOT89-5

Features:

P: Standard (default, lead free)

C: Customized