March 2016
DocID029067 Rev 1
1/4
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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.
Schematic diagram
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DocID029067 Rev 1
1 Schematic diagram
Figure 1: STEVAL-ILL079V1 circuit schematic
J1
R8
47k R9
33k
TP5
EN
R3 0
C10 22nF
TP2
SYNCH
C3 1uF 100V
U1
LED6000
DIM 12
VIN_2
3
SS
6
SYNCH
7
FSW
10
ILIM
11 COMP 8
EN
5
FB 9
GND
16
VCC
4
LX_1 13
LX_2 14
VIN_1
2VBIAS 1
BOOT 15
TP
17
C4 1uF 100V
R12
100k
C12
100pF
TP1 DIM
TP3
VIN
T1 13
2
Q1 2STR2160
32
1
R15
1k
TP8 VBIAS
C7
100nF
R16
100k
R17
22k
TP9 VLED-
C5 1uF
R13
0.51
TP6
GND
TP10 GND
C1 4.7uF 100V
R14
0
C11 220pF
R6 7.5k C9 5.6nF
TP4 VLED+
R4
0
R7 47k
C8 N.M.
R5 N.M.
C14
N.M. TP7 ICGND
D1 STPS3L60
J3
C2 4.7uF 100V
GND PLANE
IC GND
C13
1uF
25V
C6 NM
D2 BZX384-C30
L1
47uH
GSPG0203161450SG
STEVAL-ILL079V1
Revision history
DocID029067 Rev 1
3/4
2 Revision history
Table 1: Document revision history
Date
Version
Changes
04-Mar-2016
1
Initial release.
STEVAL-ILL079V1
4/4
DocID029067 Rev 1
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