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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.
询价
