STEVAL-ILL079V1 Datasheet, PDF (1/4 Pages) STMicroelectronics – Negative buck-boost topology

STEVAL-ILL079V1
0.5 A, inverting buck-boost LED driver board based on the
LED6000
Data brief
Features
 15 V to 30 V input voltage
 Negative buck-boost topology
 8 white LEDs, 0.5 A programmed current
 500 kHz switching frequency
 Digital dimming
 Compliant with ceramic output capacitors
 180° out of phase synchronization available
 Auto recovery overcurrent and thermal
protection
 RoHS compliant
Description
The STEVAL-ILL079V1 product evaluation board
is based on LED6000 monolithic current source
for high power LED driving. Thanks to the wide
device input voltage range, alternative topologies
like inverting buck-boost can be effectively
implemented. Eight white LED (30 V max.) can
be powered by 0.5 A programmed current. Digital
dimming is implemented by driving the dedicated
DIM pin and the necessary level shifting is
achieved with inexpensive external circuitry.
The LED6000 is a 61 V asynchronous switching
regulator, with an embedded power MOSFET,
designed to source up to 3 A DC current
depending on the application conditions. The 250
mV typical RSENSE voltage drop, the embedded
switch-over feature on the VBIAS pin and the
light load management (pulse skipping) are
intended to maximize power conversion
efficiency across the entire load range.
The current limit threshold and the switching
frequency are adjustable for application
optimization. The device includes an internal 250
kHz oscillator that can be externally adjusted up
to 1.5 MHz. The size of the overall application is
minimized thanks to the high switching frequency
and its compatibility with ceramic output
capacitors. Two LED6000 regulators can be
synchronized in a 180° out-of-phase
configuration for reduced total input RMS current.
March 2016
DocID029067 Rev 1
For further information contact your local STMicroelectronics sales
office
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