February 2017
DocID030327 Rev 1
1/4
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STEVAL-ILL088V1
0.55 A, positive buck-boost LED driver board based on LED6000
Data brief
Features
24 to 60 V input voltage
Step-up and step-down conversion (up to 14
LEDs)
0.55 A programmed LED current
500 kHz switching frequency
Digital dimming
Compatible with ceramic output capacitors
180° out-of-phase synchronization
Auto-recovery overcurrent and thermal
protection
RoHS compliant
Description
The STEVAL-ILL088V1 evaluation board is
based on a monolithic current source for high
power LED driving, the LED6000, a 61 V
asynchronous switching regulator. With
embedded power MOSFET, it is designed to
source up to 3 A DC current depending on the
application conditions.
The 250 mV typical RSENSE voltage drop, the
VBIAS pin embedded switch-over feature and the
light load management (pulse skipping) maximize
power conversion efficiency across the entire
load range.
Digital dimming is implemented by driving the
dedicated DIM pin.
The current limit threshold and the switching
frequency are adjustable for application
optimization.
The device also includes a 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 to reduce the
total input RMS current.
Schematic diagram
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DocID030327 Rev 1
1 Schematic diagram
Figure 1: STEVAL-ILL088V1 circuit schematic
GND PLANE
C1 4.7µF100V
C7
100nF
R9
33k
C16
N.M.
TP2
SYNCH
J1 1
2C11220pF
TP10 GND
D3 BZX384-C51
R4
0
R6 3k
L1 68uH
+
C2
33µF/63V
TP6
GND
C3 1µF100V
Q1
STN3N F06L/SOT223
R15
100R
C8 N.M.
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
C6 NM
TP7 GND
R5 N.M.
D2 STPS3L60
D4
BAS70
R12
100k
TP1 DIM
D1
STPS3L60
TP5
EN
C9 68nF
C5 1uF
C4 1µF100V
R16
N.M.
T1 1
3
2
D5
BZX384-B12
TP9 VLED-
C12
100p
TP3
VIN
TP4 VLED+
C13
N.M.
R13
0.47
TP8 VBIAS
C1022n F
C15
2.2nF
R8
47k
R7 10k
R18
N.M.
STEVAL-ILL088V1
Revision history
DocID030327 Rev 1
3/4
2 Revision history
Table 1: Document revision history
Date
Version
Changes
16-Feb-2017
1
Initial release.
STEVAL-ILL088V1
4/4
DocID030327 Rev 1
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