AN4549
Application note
Single-channel boost LED driver using the ALED6001 with graphic
user interface for quick evaluation
Introduction
The ALED6001 is an automotive-grade LED driver that combines a boost controller and
high-side current sensing circuitry optimized for driving a string of high brightness LEDs.
The device is compatible with multiple topologies such as boost, SEPIC and floating load
buck-boost. PWM dimming of the LED brightness is achieved via an external MOSFET in
series with the LED string, directly driven by a dedicated pin. Another pin allows analog
control of the LED current (10:1 analog dimming) and can also be used to limit the
temperature of the LED string (thermal feedback) by means of an NTC thermistor.
High-side current sensing in combination with a P-channel MOSFET provides effective
protection in cases where the positive terminal of the LED string shorts to ground. The high
precision current sensing circuitry allows a LED current regulation reference within +/-4%
accuracy over the whole temperature range and production spread.
A fault output (open drain) informs the host system of device over-temperature, output overvoltage (disconnected LED string) or LED overcurrent fault conditions.
Figure 1. STEVAL-ILL048V1 evaluation board
January 2015
DocID026614 Rev 2
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www.st.com
Contents
AN4549
Contents
1
STEVAL-ILL048V1 evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
Board connectors and test-points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Recommended equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Getting started with STEVAL-ILL048V1 board . . . . . . . . . . . . . . . . . . . . 8
4.1
Quick startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Appendix A STEVAL-ILL048V1 board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Appendix B OSLON_DTRL_R board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5
2/24
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
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AN4549
1
STEVAL-ILL048V1 evaluation board
STEVAL-ILL048V1 evaluation board
The STEVAL-ILL048V1 evaluation board is based on the ALED6001 in boost configuration
and is designed to drive a string of high-brightness LEDs in series, starting from a single
supply rail.
The board integrates a micro controller section that allows the user to quickly evaluate all
the ALED6001 functions through a graphic user interface (GUI) running on a PC.
Table 1 summarizes the main features of the STEVAL-ILL048V1 board.
Table 1. STEVAL-ILL048V1 board specifications summary
Parameter
Conditions
Value
Minimum input voltage
6V
Maximum input voltage
24 V
Output voltage
24 V÷40 V
Output OVP threshold
48 V
Boost section switching
frequency
FSW high (LDO3)
630 kHz
FSW pin to R14 trimmer
100 kHz-1 MHz
Minimum dimming on-time
100Hz<FDIM<20kHz
10 µs
Output (LED) current
Output current accuracy
(respect to nominal value)
350 mA
ADIM to LDO3
±4% max (<±2% typ.)
This document is intended as a reference guide to start working with the ALED6001 LED
driver only using the STEVAL-ILL048V1 board, a DC power supply and a PC.
1.1
Board connectors and test-points
The STEVAL-ILL048V1 board has a set of connectors and test points that facilitate
interfacing it with the measurement equipment. The following tables summarize the function
of each terminal and test-point on the board.
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STEVAL-ILL048V1 evaluation board
AN4549
Table 2. STEVAL-ILL048V1 board terminals description
Connector
Description
VIN
Input voltage, positive terminal
GND
Reference ground
LED_A
Positive terminal of the LED string (anode)
LED_K
Negative terminal of the LED string (cathode)
VOUT
Boost regulator output voltage
ADIM
Analog dimming control
PWMI
Enable/PWM dimming control
FSW
Boost converter synchronization input
XFAULT
Fault signal, active low
Table 3. STEVAL-ILL048V1 board test-points description
Connector
4/24
Description
TP1
VIN pin
TP2
VDR pin
TP3
LDO3 pin
TP4
GATE pin
TP5
Switching node
TP6
R6 sensing resistor, hot terminal
TP7
CSNS pin
TP8
Boost converter output voltage
TP9
OVFB pin
TP10
VFBP pin
TP11
VFBN pin
TP12
COMP pin
TP13
PWMO pin
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AN4549
2
Recommended equipment
Recommended equipment
The on-board MCU section controls all the functions of the ALED6001 by applying the
required signals and reading back certain voltages.
Rapid evaluation of the ALED6001 can be performed with just a DC power supply and a PC
with USB connectivity; more detailed performance analyses require conventional lab
equipment (digital multi-meters, oscilloscope, etc.).
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24
Configuration
3
AN4549
Configuration
The STEVAL-ILL048V1 board allows the user to select different options by acting on a set of
jumpers and switches (see Table 4 and Table 5).
Table 4. STEVAL-ILL048V1 jumpers’ description
6/24
Jumper
Function
Default position
JP1
The input filter consists of C1, C2, L1, C2 and C3
and it has been added to reduce EMI emission.
In the default setting, JP1 is closed and L1 is
shorted so that its DC resistance does not affect
the overall efficiency.
Closed
JP2
The JP2 jumper is used to measure the real
current consumption of the ALED6001. Once
JP1 is removed, a current meter can be
connected in series with the VIN pin of the
device.
Closed
JP3
The JP3 jumper is used to measure the current
consumption of the external circuitry connected
to the 3.3V LDO of the ALED6001. Once JP3 is
removed, a current meter can be connected in
series with the LDO3 pin of the device.
Closed
JP4
If this jumper is removed, the VFBP pin is
disconnected from the sensing resistor and the
ALED6001 returns a fault condition (XFAULT pin
low)
Closed
JP5
If this jumper is removed, the VFBP pin is
disconnected from the sensing resistor and the
ALED6001 returns a fault condition (XFAULT pin
low)
Closed
JP6
If this jumper is removed, the VFBP pin is
disconnected from the sensing resistor and the
ALED6001 returns a fault condition (XFAULT pin
low)
Closed
JP7
This jumper enables high-side PMOS driving.
When a simple low-side dimming NMOS is used,
this jumper should be open to avoid undesired
power dissipation.
Open
JP8
This jumper connects the FSW pin of the
ALED6001 to LDO3 (630 kHz default switching
frequency, dot position) or to the R14 trimmer
(100 kHz–1 MHz adjustable switching frequency.
Left (dot)
JP9
This jumper connects the ADIM pin of the
ALED6001 to LDO3 (full-scale LED current) or to
the R18 trimmer (adjustable 30 mV–300 mV
feedback reference for analog dimming)
Left (dot)
JP10
“VIN” LED disconnection
Closed
JP11
“VOUT” LED disconnection
Closed
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AN4549
Configuration
Table 4. STEVAL-ILL048V1 jumpers’ description (continued)
Jumper
Function
Default position
JP12
“LDO3” LED disconnection
Closed
JP13
“VDR” LED disconnection
Closed
JP14
This jumper powers the MCU from the LDO3 pin
of the ALED6001. The SW1 switch must be in
the “ON” position to ensure the MCU is powered
when the input voltage is applied.
Open
JP15
If this jumper is closed, the R43-C39 snubber is
connected in parallel to the Q3 low-side switch in
order to damp undesired oscillations that may
occur in long wiring between the board and the
LED string (parasitic inductance)
Open
Table 5. STEVAL-ILL048V1 switches’ description
Jumper
Function
Default position
SW1
If this switch is in the default position (left, dot),
the PWMI pin of the ALED6001 is left floating,
i.e. tied to ground by the internal pull-down
resistor. If moved to the right position, the PWMI
pin is pulled-up by the input rail and the device
turns-on.
Left (dot)
SW2
This jumper is used to assign the LED_A
connector according to the selected dimming
MOSFET (low-side or high-side). If the low-side
dimming MOSFET is used, this jumper must be
in the upper position (dot).
Upper (dot)
SW3
This jumper is used to assign the LED_A
connector according to the selected dimming
MOSFET (low-side or high-side). If the low-side
dimming MOSFET is used, this jumper must be
in the upper position (dot).
Upper (dot)
SW4
This switch array is used to connect the
ALED6001 to the on-board MCU, allowing the
latter to control the device. If external signals
have to be applied to specific pins of the
ALED6001, the related switch must be opened to
avoid conflict with the MCU.
Right (all ON)
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Getting started with STEVAL-ILL048V1 board
4
AN4549
Getting started with STEVAL-ILL048V1 board
Figure 2 shows how to connect the STEVAL-ILL048V1 board to the DC power supply and
the LED string. Alternatively, an OSLON_DTRL_x board (see Appendix B) can be directly
connected to CON1 on the STEVAL-ILL048V1 board.
Figure 2. Basic setup for quick evaluation
4.1
Quick startup
The following step-by-step sequences provide a guideline to quickly connect the STEVALILL048V1 board to the PC and evaluate the ALED6001 performance.
1.
Working in an ESD-protected environment is highly recommended. Check all wrist
straps and mat earth connections before handling the STEVAL-ILL048V1 board.
2.
Check all the jumpers are set according to Figure 3. Note that JP9 is removed to give
the MCU full control of the ADIM pin.
Figure 3. Jumpers and switches default settings
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AN4549
Getting started with STEVAL-ILL048V1 board
3.
Connect a 12 V±10% (3 A current capability) power supply to the STEVAL-ILL048V1
board (VIN and GND terminals).
4.
Connect a suitable LED string (8-12 high-brightness White LEDs capable of handling at
least 350 mA) between LED-A & LED-K terminals. If the OSLON_DTRL_x board is
used, connect it to CON1 of the STEVAL-ILL048V1 board.
5.
Connect the STEVAL-ILL048V1 board to the PC via a USB cable. The yellow “LINK”
LED should light after a while. You may need to install the STM32 Virtual COM Port
Driver on the PC beforehand.
6.
Launch the STEVAL-ILL048V1 Control Tool and click on “Autodetect” for the tool to
locate the evaluation board port. Manual assignment of the COM port is also possible
via the “Select COM” button.
Figure 4. Control tool window: link status
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24
Getting started with STEVAL-ILL048V1 board
7.
AN4549
Turn on the power supply. The LED string should turn on at 3% PWM dimming. Check
the voltage of the LDOs (LDO3 and VDR pins) and the output voltage of the boost
converter.
Figure 5. Control tool window: XFAULT pin and voltages monitor
8.
In the “digital dimming” section, change the frequency and duty-cycle of the PWM
signal applied to the PWMI pin of the device. If the duty-cycle is set to zero, the device
shuts-down.
Figure 6. Control tool window: PWM dimming management
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AN4549
Getting started with STEVAL-ILL048V1 board
9.
In the analog dimming section, change the DC level at the ADIM pin of the device. The
real value is read back by the on-board MCU.
Figure 7. Control Tool window: analog dimming management
10. Digital and analog dimming controls can operate at the same time. A “Start demo”
button for each dimming mode runs the respective demo.
Figure 8. Control tool window: demo-mode management
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Getting started with STEVAL-ILL048V1 board
AN4549
11. The switching frequency of the boost converter can be changed during runtime by
applying a synchronization signal at the FSW pin of the device. Preset values can be
selected through the dedicated section of the control tool.
Figure 9. Control tool window: external synchronization selection
12. The XFAULT pin of the device is monitored in real-time. To simulate a fault condition,
remove any of SW2, SW3, JP4, JP5 or JP6: the XFAULT pin goes low and the +5V
LDO is disabled.
Figure 10. Control tool window: faulty condition detected
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Getting started with STEVAL-ILL048V1 board
13. Normal operation can resume once the fault condition is cleared and the device is reset
by toggling the PWMI pin (digital dimming to zero for more than 10ms and then high
again).
Figure 11. Control tool window: device turned-off at zero PWM dimming
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1
CON1
J12
CON1
J9
CON1
J8
CON1
J7
CON1
J2
CON1
1
1
1
1
C1
47u
0
VCC_INT
SIL2
JP1
10u
D9 R-LED
XFAULT
C2
10u
L1
R22 680R
R21 47k
SIL2
JP3
0
0
3
C11
1u
L DO
VCC_INT
C4
10u
TP3
T POINT R
C3
47u
47u
GATE
TP4
T POINT R
L2
D1 STPS3L60
ND
PWMI
FSW
XFAULT
LDO3
SGND
COMP
ADIM
OVFB
G
TP8
T POINT R
TP6
T POINT R
3R3
R5
T POINT R
0
R6
0R1
1
2
3
4
5
6
7
8
CSNS
PWMI
FSW
XFAULT
LDO3
SGND
COMP
ADIM
OVFB
U1
PGND
1k8
R7
Q1
STD12NF06L
LX
TP5
100p
C13
COMP
VFBP
VFBN
VIN
VDR
GATE
PGND
PWMO
CSNS
ALED6001
T POINT R
TP7
D2 STPS3L60
TPAD
17
SIL2
JP6
0
C12
4n7
R12
47k
TP12
T POINT R
16
15
14
13
12
11
10
9
R2
5k6
R1
220k
TPAD
VFBP
VFBN
VIN
VDR
GATE
PGND
PWMO
CSNS
OVFB
0
C10
1u
TP2
T POINT R
T POINT R
TP9
C7
4u7
SW1
SIL3
+VIN
0
D4
0
PWMI
C8
4u7
PWMO
TP13
+VIN
BZT52C4V7
2
R19
47k
T POINT R
C9
470n
SIL2
JP2
C6
100u
TP1
T POINT R
C5
100u
5R6
R8
0
R20
100k
R11
10k
R10
1k
1
R9
2k2
JUMPER 2
PW
CON1
J10
VFBN
T POINT R
TP11
JP7
M
I
C14
10n
VFBP
T POINT R
TP10
SIL2
JP4
FXD_LED+
PWM_LED-
PWM_LED+
STN3PF06
Q3
R16
16k
Q2
IRLML0060TRPBF
D3
MMSZ5245B
SIL2
JP5
R3
1R5
1
3
1
R18
50k
R17
68k
VCC_INT
3
+VIN
0
0
1u
C15
2 LED_K
SW3
SIL3
2 LED_A
SW2
SIL3
R4
2R0
VOUT
3
1
3
1
DocID026614 Rev 2
1
14/24
0
CON1
J4
CON1
J3
2
NTC-
NTC+
G
ND
L ED_ K
ADIM
CON1
J6
CON1
J5
JP9
SIL3
1
1
C39
2n2
R43
47R
JP15
JUMPER 2
1
1
1
ADI M
CON1
J11
100n
C17
LED_K
LED_A
VDR
VCC_INT
VOUT
+VIN
VI N
UT
3
L4
L3
BEAD
0
C16
N.M.
VCC_INT
NTC+
NTC-
R26 1k
R25 390R
R24 15k
R23 5k6
R27
1k
0
BEAD
D8 R-LED
VDR
D7 R-LED
L DO
D6 B-LED
VO
D5 Y -LED
1
0
R15
47k
R14
500k
JP8
SIL3
2
R13
470R
FSW
1
2
3
4
5
6
7
8
JUMPER 2
JP13
JUMPER 2
JP12
JUMPER 2
JP11
JUMPER 2
JP10
CON8
CON1
0
1
FSW
CON1
J13
Appendix A
3
J1
STEVAL-ILL048V1 board
AN4549
STEVAL-ILL048V1 board
Figure 12. STEVAL-ILL048V1 board schematic (LED driver section)
GSPG2901150945SG
6
7
SLD
100n
C34
22p
100n
C22
8MHz
10k
R36
C29
C33
22p
Y1
8
9
VOUT_uC
LDO3_uC
ADIM_uC
1
2
3
4
5
6
7
8
9
10
11
12
C32
FD-
FD+
VDR_uC
PWMI_uC
XFAULT_uC
VDD
JTRST
PBUTT1
PBUTT2
PBUTT3
3
1
U3
5
VDD
VSS
2
CON2
1
2
3
4
5
USBDP
USBDN
6
4
VDD
VBAT
PC13
PC14
PC15
OSCI
OSCO
NRST
VSSA
VDDA
PA0
PA1
PA2
100n
LINK_LED
BUSY _LED
USBUF02W6
UD-
UD+
200mA
48
47
46
45
44
43
42
41
40
39
38
37
STM32F103C6T6
VDD3
VSS3
PB9
PB8
BOOT0
PB7
PB6
PB5
PB4
PB3
PA15
PA14
C30
VDD2
VSS2
PA13
PA12
PA11
PA10
PA9
PA8
PB15
PB14
PB13
PB12
36
35
34
33
32
31
30
29
28
27
26
25
100n
U2
JTRST
JTDO
JTDI
JTCK
PWM2_uC
PA3
PA4
PA5
PA6
PA7
PB0
PB1
PB2
PB10
PB11
VSS1
VDD1
DocID026614 Rev 2
13
14
15
16
17
18
19
20
21
22
23
24
VDD
100n
JTMS
USBDP
USBDN
C31
BEAD
FSW_uC
VDD
C23
100n
L5
1
2
D10
B-LED
R37
1k
C24
4u7
VUSB
C25
100n
5
1
SD
VIN
U4
BY P
VOUT
LK11233
GND
2
F1
4
JTRST
PBUTT3
PBUTT2
PBUTT1
3
C37
C36
C35
C26
100n
P2
1
3
P3
1
3
C38
100n
RESET
1
R42 100R
PB4
2
100n
1
3
R41 100R
PB3
2
4
100n
PB2
2
4
100n
P1
R40 100R
PB1
2
4
C27
100n
VDD
C28
4u7
SIL2
JP14
VCC_INT
VDD
1k
R39
1
D12
1
D11
JTRST
JTDI
JTMS
JTCK
JTDO
1k
R38
2
CON3
2
BUSY _LED
2
4
6
8
10
VDD
LINK_LED
C_JTAG_M
1
3
5
7
9
Y -LED
R-LED
PWM2_uC
47k
R29
0
C18
1u
ADIM_uC
C19
1u
VOUT_uC
R28
10k
0
R31
15k
R30
220k
C20
1u
LDO3_uC
FSW_uC
XFAULT_uC
PWMI_uC
0
R33
100k
R32
22k
C21
1u
VDR_uC
0
R35
100k
R34
100k
SW DIP-8
SW4
FSW
XFAULT
VOUT
LDO3
VDR
PWMI
ADIM
AN4549
STEVAL-ILL048V1 board
Figure 13. STEVAL-ILL048V1 board schematic (MCU section)
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24
STEVAL-ILL048V1 board
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Table 6. BOM
Qty Component
Description
Package
Part-Number
SIL8
613-008-143-121
MFR
Value
1
CON1
8 pin female header
1
CON2
Mini USB connector
6510-0516121
1
CON3
5x2 female connector
6233-10235321
2
C1,C3
Aluminum, 50V
D8
EEEFK1H470XP
Panasonic
47u
2
C5,C6
Aluminum, 50V
F
EEEFP1H101AP
Panasonic
100u
4
C2,C4,C7,
C8
MLCC, 50V, X7R, 10%
1210
GCM32ER71H475KA40
Murata
4.7u
1
C9
MLCC, 50V, X7R, 10%
0805
GCM21BR71H474KA40
470n
7
C10,C11,
C15
C18,C19,
C20, C21
MLCC, 25V, X7R, 5%
GCM188R71E105KA64
1u
1
C39
MLCC, 50V, X7R, 10%
GCM188R71H222KA37
2n2
1
C12
MLCC, 50V, X7R, 10%
GCM188R71H103JA37
10n
1
C13
MLCC, 50V, C0G, 5%
GCM1885C1H101JA16
100p
1
C14
MLCC, 50V, X7R, 10%
GCM188R71H103KA37
10n
0603
Wurth
Elektronik
C16
N.M.
14
C17,C22,
C23,C25,
C26,C27
C29,C30,
C31,C32,
C35,C36
C37,C38
MLCC, 50V, X7R, 10%
2
C24,C28
MLCC, 10V, X7R, 10%
2
C33,C34
2
1
GCM188R71H104KA57
100n
1206
GCM31CR71A106KA64
10u
MLCC, 50V, C0G, 5%
0603
GCM1885C1H220JA16
22p
D1,D2
Schottky, 60V, 3A
SMB
STPS3L60SY
ST
D3
Zener 15V 400mW
MMSZ5245B
Zetex
SOD123
1
D4
Zener 4.7V1 400mW
BZT52C4V7S
Zetex
2
D6,D10
Blue LED
KP-2012PBC-A
Kingbright
4
D7,D8,D9
D11
Red LED
2
D5,D12
Yellow LED
1
F1
Fuse
16/24
0805
KP-2012SRC-PRV
KP-2012SYC
1206
0466.200NR
DocID026614 Rev 2
Littelfuse
200mA
AN4549
STEVAL-ILL048V1 board
Table 6. BOM (continued)
Qty Component
Description
Package
13
J1,J2,J3,
J4,J5
J6,J7,J8,J9,
J10,J11,J12,
J13
Faston terminal
hole
1.2mm
11
JP1,JP2,
JP3,JP4,
JP5,JP6
JP7,JP10,
JP11,JP12,
JP13
jumper
SIL2
2
JP8,JP9
jumper selector
SIL3
JP14,JP15
jumper
tin-drop
L1
custom
custom
1
Part-Number
MFR
MSS1260T-103
Value
10u
Coilcraft
1
L2
custom
custom
MSS1260T-473
47u
3
L3,L4,L5
Ferrite bead, 600Ω, 0.6A
0805
BLM21AG601SN1
Murata
3
PB1,PB2,
PB3
430453031836
Pushbutton
Wurth
Elektronik
1
PB4
1
Q1
NMOS 60V 12A
DPAK
STD12NF06L
ST
1
Q2
NMOS 60V 2.5A
SOT23
IRLML0060TRPBF
IR
1
Q3
PMOS 60V 2.5A
SO8
STN3PF06
ST
2
R1,R30
Resistor, 1%, 0.125W
0603
2
R2,R23
1
R3
0R
434123025816
220k
5k6
ERJ8BQF1R5V
1
R4
Sensing resistor
1%, 0.5W
1
R5
Resistor, 1%, 0.125W
0603
1
R6
Sensing resistor
1020
1206
1R5
Panasonic
ERJ8BQF2R0V
2R0
3R3
ERJB2CFR10V
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Panasonic
R100
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Table 6. BOM (continued)
Qty Component
Description
Package
Part-Number
MFR
Value
1
R7
1k8
1
R8
5R6
1
R9
6
R10,R26
R27,R37
R38,R39
1
R11
1
R12
1
R16
2k2
0603
1k
Resistor, 1%, 0.125W
0805
10k
39k
16k
0603
2
R28,R36
10k
1
R13
470R
1
R14
500k
Through-hole trimmer
SIL3
1
R18
50k
1
R17
68k
4
R20,R33
R34,R35
100k
4
R15,R19
R21,R29
47k
1
R22
680R
0603
Resistor, 1%, 0.125W
2
R24,R31
1
R25
390R
1
R32
22k
3
R40,R41,R4
2
100R
1
R43
1
SW1
switch selector
SIL3
2
SW2,SW3
jumper selector
SIL3
1
SW4
DIP switch
13
TP1,TP2,
TP3,TP4,
TP5, TP6
TP7,TP8,
TP9,TP10,
TP11,TP12,
TP13
Test point (white)
18/24
15k
0805
47R
MMP1010D
Knitter
DIL8
DBS3108
Knitter
hole 1mm
200-202
RS
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STEVAL-ILL048V1 board
Table 6. BOM (continued)
Qty Component
Description
Package
Part-Number
MFR
Value
1
U1
LED driver
TSSOP 16
ALED6001
ALED6001
1
U2
Microcontroller
LQFP-48
STM32F103C6T6
STM32F103
C6T6
ST
1
U3
USB protector
SOTT-123
USBUF02W6
USBUF02W6
1
U4
3V3 Linear regulator
SOT-23
LK112M33TR
LK11233
1
Y1
Crystal resonator
FQ7050B
FQ7050B-8.000
FOX
8MHz
Figure 14. Top side components placement
Figure 15. Bottom side components placement
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OSLON_DTRL_R board
Appendix B
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OSLON_DTRL_R board
Figure 16. OSLON_DTRL_L and STEVAL-ILL048V1 assembly
The OSLON_DTRL_R board is a simple LED string involving 12 High-Brightness, OSRAM
Opto white LEDs (OSLON series) and a few other components. It can be easily coupled to
the STEVAL-ILL048V1 evaluation board via the 8-pin strip connector (CON1).
A negative temperature coefficient (NTC) thermistor is thermally coupled to the LED string in
order to provide a feedback signal to the LED driver. As visible in the schematic of the
STEVAL-ILL048V1 board (see Appendix A), the ADIM pin of the ALED6001 is connected to
this signal and used for limiting the operating temperature of the LEDs through a closed
loop. Optionally, if a LED current lower than the default 350 mA is desired, a fixed value
resistor can be selected through the JP1 jumper (Figure 17).
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OSLON_DTRL_R board
Figure 17. OSLON_DTRL_R board schematic
TP1
T POINT R
TP2
T POINT R
D1
LED
F1
0.75A
TP3
T POINT R
TP4
T POINT R
TP5
T POINT R
TP6
T POINT R
D2
D3
D4
D5
D6
LED
LED
LED
LED
LED
TP7
T POINT R
CON1
1
2
3
4
5
6
7
8
D12
D11
D10
D9
D8
D7
CON8
LED
SHIELD
ESD
LED
T POINT R
TP12
TP13
T POINT R
0
RT1
LED
T POINT R
TP11
LED
T POINT R
TP10
LED
T POINT R
TP9
LED
T POINT R
TP8
R1
t
47k
N.M.
JUMPER 3
3
2
1
JP1
Table 7. OSLON_DTRL_R component list
Qty
Component Description
Package
Part-Number
MFR
1206SFF075F/63-2
Littlefuse
NCP18WB473J03RB
Murata
LUW H9QP
OSRAM
Opto
1
F1
fuse
1206
1
R1
resistor
0603
1
RT1
47k NTC
0603
1
CON1
Strip
connector
SIL8 SMD
12
D1…D12
White LEDs
custom
Figure 18. OSLON_DTRL_R board layout and components placement (top)
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Figure 19. OSLON_DTRL_R board layout and components placement (bottom)
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Revision history
Revision history
Table 8. Document revision history
Date
Revision
Changes
11-Dec-2014
1
Initial release.
29-Jan-2015
2
Updated Figure 12 on page 14.
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