汇创佳电子代理BL9582B

Simplelowpartscount

z Internal 32V NDMOS switch

z Upto1.4Aoutputcurrent

z Single pin on/off and brightness control

usingDCvoltageorPWM

z Soft Start

z Highefficiency(upto97%)

z Wideinputvoltagerange:6Vto32V

z Output shutdown

z Up to 1MHz switching frequency

z Inherent open-circuit LEDprotection

z Typical 4% output currentaccuracy

z High-side current sense

z Hysteretic control: no compensation

z Adjustable constant LED current

z Over temperature protection

z Pb-free SOT89-5 packages

APPLICATIONS

z Low voltage halogen replacement LEDs

z Automotive lighting

z Low voltage industrial lighting

z LED back-up lighting

z Illuminated signs

z LCD TV backlighting

DESCRIPTION

The BL9582B 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 BL9582B 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.