The 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 40V and provides an externally adjustable
output current of up to 1A. Depending upon supply
voltage and external components, this can
provide up to 30 watts of output power.
The 1 includes the output switch and a
high-side output current sensing circuit, which
uses an external resistor to set the nominal
average output current.
Applications Output current can be adjusted below the set
value, by applying an external control signal to the n Low voltage halogen replacement LEDs VSET pin. n Low voltage industrial lighting
n LED back-side lighting The VSET pin will accept either a DC voltage or a
n Illuminated signs PWM waveform.
The soft-start time can be increased using an
external capacitor from the VSET pin to ground.
Applying a voltage of 0.2V or lower to the VSET
pin turns the output off and switches the device
into a low current standby state.
nSimple low parts count
nInternal 40V NDMOS switch
n1A output current
nSingle pin on/off and brightness control
Using DC voltage or PWM
nSoft-start
nHigh efficiency (up to 97%)
nWide input voltage range: 6V to 40V
nOutput shutdown
n Open LED Protection
n Short LED Protection
nUp to 1MHz switching frequency
nInherent open-circuit LED protection
nTypical 5% output current accuracy
nPb-free SOT23-5 and SOT89-5 Packages
1

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