Home - STMicroelectronics - AN4549 Application note€¦ · Manual assignment of the COM port is also possible via the “Select COM” button. Figure 4 ... SW3, JP4, JP5 or JP6:

January 2015 DocID026614 Rev 2 1/24

AN4549Application note

Single-channel boost LED driver using the ALED6001 with graphicuser interface for quick evaluation

IntroductionThe 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 over-voltage (disconnected LED string) or LED overcurrent fault conditions.

Figure 1. STEVAL-ILL048V1 evaluation board

www.st.com

http://www.st.com

Contents AN4549

2/24 DocID026614 Rev 2

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 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

DocID026614 Rev 2 3/24

AN4549 STEVAL-ILL048V1 evaluation board

24

1 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.

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-pointsThe 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.

Table 1. STEVAL-ILL048V1 board specifications summa ry

Parameter Conditions Value

Minimum input voltage 6 V

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

ADIM to LDO3

350 mA

Output current accuracy (respect to nominal value)

±4% max (<±2% typ.)

STEVAL-ILL048V1 evaluation board AN4549

4/24 DocID026614 Rev 2

Table 2. STEVAL-ILL048V1 board terminals descriptio n

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 descript ion

Connector 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

DocID026614 Rev 2 5/24

AN4549 Recommended equipment

24

2 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.).

Configuration AN4549

6/24 DocID026614 Rev 2

3 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

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



Closed

JP6



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

DocID026614 Rev 2 7/24

AN4549 Configuration

24

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


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)

Table 4. STEVAL-ILL048V1 jumpers’ description (cont inued)


Getting started with STEVAL-ILL048V1 board AN4549

8/24 DocID026614 Rev 2

4 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 startupThe following step-by-step sequences provide a guideline to quickly connect the STEVAL-ILL048V1 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

DocID026614 Rev 2 9/24

AN4549 Getting started with STEVAL-ILL048V1 board

24

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


10/24 DocID026614 Rev 2

7. 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 volta ges 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 manageme nt

DocID026614 Rev 2 11/24


24

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 manag ement

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


12/24 DocID026614 Rev 2

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 synchroniza tion 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 de tected

DocID026614 Rev 2 13/24


24

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 a t zero PWM dimming

STEVAL-ILL048V1 board AN4549

14/24 DocID026614 Rev 2

Appendix A STEVAL-ILL048V1 board

Figure 12. STEVAL-ILL048V1 board schematic (LED dri ver section)

FS

WP

WM

I

PW

MO

R8

5R

6

C3

47

uC

51

00

uC

61

00

uC

41

0u

C7

4u

7C

84

u7

C1

11

u

C1

3

10

0p

C1

24

n7

J1

CO

N1

1

J2

CO

N1

1

J3

CO

N1

1

J5

CO

N1

1

J4

CO

N1

1

0

00

VO

UT

R4

2R

0

Q1

STD

12

NF

06

L

Q3

STN

3P

F0

6

L2

47

uD

2S

TP

S3

L6

0

0

R6

0R

1

0

R5

3R

3

GA

TE

0

R1

24

7k

0

LD

O3

CO

MP

R1

76

8k

VC

C_

INT

J1

1

CO

N1

1

J1

0

CO

N1

1

0R2

01

00

k

R1

22

0k

R3

1R

5

R2

5k6

0

J1

3

CO

N1

1

R1

01

k

R9

2k2

D3

MM

SZ

52

45

B

TP

12

T P

OIN

T R

TP

3

T P

OIN

T R

TP

13

T P

OIN

T R

TP

4

T P

OIN

T R

TP

5

T P

OIN

T R

TP

10

T P

OIN

T R

TP

11

T P

OIN

T R

TP

9

T P

OIN

T R

TP

7

T P

OIN

T R

0

LDO

3

FSW

PW

MI

ADIM

TP

6

GND

T P

OIN

T R

LED_K

C9

47

0n

TP

AD

0

J6

CO

N1

1

C1

6N

.M.

0

J1

2

CO

N1

1

+V

IN

XF

AU

LT

JP

8S

IL3

1 3

2

NTC

-

U1

AL

ED

60

01

5S

GN

D

VIN

14

4L

DO

3

1P

WM

I2

FS

W3

XF

AU

LT

6C

OM

P7

AD

IM8

OV

FB

CS

NS

PW

MO

9

PG

ND

10

GA

TE

11

VD

R1

21

3

VF

BN

VF

BP

15

16

TPAD17

AD

IM

XF

AU

LT

PW

MI

JP

5

SIL

2

JP

4

SIL

2JP

6

SIL

2

VD

R

OV

FB

C1

01

u

VF

BN

VF

BP

TP

2

T P

OIN

T R

JP

7

JU

MP

ER

2

FXD

_L

ED

+

R7 1k8

R2

71

k

CS

NS

C1

7

10

0n

TP

8

T P

OIN

T R

GND

NTC

-

D5

Y-L

ED

R2

35

k6

+V

IN

JP

10

JU

MP

ER

2

D6

B-L

ED

R2

41

5k

VO

UT

JP

11

JU

MP

ER

2

D7

R-L

ED

R2

53

90

RV

CC

_IN

T

JP

12

JU

MP

ER

2

JP

3

SIL

2

VC

C_

INT

D8

R-L

ED

R2

61

kV

DR

JP

13

JU

MP

ER

2

0

L1

10

u

C1

47

u

R4

34

7R

C2

10

u

C3

9

2n

2

PG

ND

PW

M_

LE

D+

LE

D_

K

JP

15

JU

MP

ER

2

LE

D_

A

D1

ST

PS

3L

60

TP

1

T P

OIN

T R

VIN

J7

CO

N1

1

J8

CO

N1

1

J9

CO

N1

1

JP

1

SIL

2

VIN

VO

UT

VDR

LDO

3

LX

VC

C_

INT

SW

1S

IL3

13

2

L3

BE

AD

R1

54

7k

L4

BE

AD

LE

D_

K

LE

D_

A

JP

2

SIL

2

+V

IN

R1

11

0k

JP

9S

IL3

13

2

C1

41

0n

C1

5

1u

0

R1

61

6k

NTC

+

CO

N1

CO

N8

1 2 3 4 5 6 7 8N

TC

+

SW

2

SIL

3

1 3

2

FS

W

Q2

IRL

ML

00

60

TR

PB

F

SW

3

SIL

3

1 3

2

R1

45

00

k

R1

85

0k

D4

BZ

T5

2C

4V

7

R2

26

80

R

R1

34

70

R

0

R2

14

7k

PW

M_

LE

D-

0

R1

94

7k

VC

C_

INT

D9

R-L

ED

PG

ND

VF

BN

+V

IN

PW

MO

VF

BP

GA

TE

SG

ND

CS

NS

OV

FB

AD

IMC

OM

P

GSPG2901150945SG

DocID026614 Rev 2 15/24

AN4549 STEVAL-ILL048V1 board

24

Figure 13. STEVAL-ILL048V1 board schematic (MCU sec tion)

LD

O3

_u

C

BE

AD

L5

XF

AU

LT

_u

C

Y1

8M

Hz

R39

1k

R37

1k

U3

US

BU

F0

2W

6

VDD5

FD

+1

FD

-3

UD

-4

UD

+6

VSS2

C23

10

0n

VD

D

VD

D

C31

10

0n

U4

LK

11

23

3

VIN

5

SD

13

BY

P

4V

OU

T

2GND

FS

W_

uC

R38

1k

BU

SY

_L

ED

D11

R-L

ED

12

VD

D

C25

10

0n

U2

PA6

STM

32

F1

03

C6

T6

VB

AT

1 2P

C1

33

PC

14

4P

C1

55

OS

CI

6O

SC

O

16PA515

PB018

PB

13

26

PB

12

25

VDD124VSS123PB1122

PB220PB119

7N

RS

TV

SS

A8

VD

DA

9

PA

01

0

PA

11

1

PA414

PB1021

PB

14

27

PA

8P

A9

29

PA

10

30

PA

11

31

32

VS

S2

VD

D2

35

36

PA14PA1537

PB338

PB439

PB540

PB641

PB74243

PA

21

2

PA313

BOOT0PB844

PB945

VSS346

VDD34748

PA

13

34

PA

12

33

PB

15

28

PA717

VD

D

VD

D

VO

UT

_u

C

C30

10

0n

CO

N2

1 2 3

9

4

7

5

86

R36

10k

VU

SB

C22

100n

US

BD

P

VD

D

CO

N3

1 C_JTA

G_M

23

45

67

89

10

PB

4R

ES

ET

21

C27

10

0n

C36

100n

C32

10

0n

C37

100n

BU

SY

_L

ED

C38

100n

C29

10

0n

PW

M2_uC

LIN

K_

LE

D

F1

20

0m

A

JTM

S

VD

D

US

BD

N

PB

UTT

1

US

BD

P

US

BD

NSLD

JT

RS

T

C26

10

0n

JTC

KJTD

IJTD

O

PB

1P

12

1 34

PB

UTT

2

JTR

ST

JT

RS

T

R41

100R

JT

DI

PB

UTT

3

JTM

S

R42

100R

C34

22

pJT

CK

PB

UT

T1

PB

2P

22

1 34

C35

100n

JT

DO

PB

UT

T2

R40

100R

PB

UT

T3

C33

22

p

PB

3P

32

1 34

LIN

K_

LE

D

D10

B-L

ED

1 2

D12

Y-L

ED

12

JTR

ST

VD

R_

uC

PW

MI

VO

UT

XF

AU

LT

FS

W

AD

IM_

uC

R3

02

20

k

R3

11

5k

0

C1

9

1u

VO

UT

_u

C

PW

MI_

uC

XF

AU

LT_

uC

FS

W_

uC

R29

47

k

C1

81

u

0

AD

IM_

uC

JP

14

SIL

2

VC

C_

INT

PW

M2_uC

AD

IM

SW

4

SW

DIP

-8

VD

RL

DO

3

R3

22

2k

R3

31

00

k

0

C2

0

1u

LD

O3

_u

C

R3

41

00

k

R3

51

00

k

0

C2

1

1u

VD

R_

uC

R2

8

10

k

C2

4

4u

7

C28

4u

7

PW

MI_

uC


16/24 DocID026614 Rev 2

Table 6. BOM

Qty Component Description Package Part-Number MFR Value

1 CON1 8 pin female header SIL8 613-008-143-121Wurth

Elektronik1 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

4C2,C4,C7,

C8MLCC, 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%

0603

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

C16 N.M.

14

C17,C22, C23,C25, C26,C27 C29,C30, C31,C32, C35,C36 C37,C38

MLCC, 50V, X7R, 10% GCM188R71H104KA57 100n

2 C24,C28 MLCC, 10V, X7R, 10% 1206 GCM31CR71A106KA64 10u

2 C33,C34 MLCC, 50V, C0G, 5% 0603 GCM1885C1H220JA16 22p

2 D1,D2 Schottky, 60V, 3A SMB STPS3L60SY ST

1 D3 Zener 15V 400mWSOD123

MMSZ5245B Zetex

1 D4 Zener 4.7V1 400mW BZT52C4V7S Zetex

2 D6,D10 Blue LED

0805

KP-2012PBC-A Kingbright

4D7,D8,D9

D11Red LED KP-2012SRC-PRV

2 D5,D12 Yellow LED KP-2012SYC

1 F1 Fuse 1206 0466.200NR Littelfuse 200mA

DocID026614 Rev 2 17/24


24

13

J1,J2,J3, J4,J5

J6,J7,J8,J9,J10,J11,J12,

J13

Faston terminalhole

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

1 L1 custom custom MSS1260T-103Coilcraft

10u

1 L2 custom custom MSS1260T-473 47u

3 L3,L4,L5 Ferrite bead, 600Ω, 0.6A 0805 BLM21AG601SN1 Murata 0R

3PB1,PB2,

PB3 Pushbutton430453031836 Wurth

Elektronik1 PB4 434123025816

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,R30Resistor, 1%, 0.125W 0603

220k

2 R2,R23 5k6

1 R3 Sensing resistor 1%, 0.5W

1206ERJ8BQF1R5V

Panasonic1R5

1 R4 ERJ8BQF2R0V 2R0

1 R5 Resistor, 1%, 0.125W 0603 3R3

1 R6 Sensing resistor 1020 ERJB2CFR10V Panasonic R100

Table 6. BOM (continued)



18/24 DocID026614 Rev 2

1 R7

Resistor, 1%, 0.125W

0603

1k8

1 R8 5R6

1 R9 2k2

6R10,R26R27,R37

R38,R39

1k

1 R11 0805 10k

1 R12

0603

39k

1 R16 16k

2 R28,R36 10k

1 R13 470R

1 R14Through-hole trimmer SIL3

500k

1 R18 50k

1 R17

Resistor, 1%, 0.125W0603

68k

4R20,R33R34,R35

100k

4R15,R19R21,R29

47k

1 R22 680R

2 R24,R31 15k

1 R25 390R

1 R32 22k

3R40,R41,R4

2100R

1 R43 0805 47R

1 SW1 switch selector SIL3 MMP1010D Knitter

2 SW2,SW3 jumper selector SIL3

1 SW4 DIP switch DIL8 DBS3108 Knitter

13

TP1,TP2, TP3,TP4, TP5, TP6 TP7,TP8,

TP9,TP10, TP11,TP12,

TP13

Test point (white) hole 1mm 200-202 RS



DocID026614 Rev 2 19/24


24

Figure 14. Top side components placement

Figure 15. Bottom side components placement

1 U1 LED driver TSSOP 16 ALED6001

ST

ALED6001

1 U2 Microcontroller LQFP-48 STM32F103C6T6STM32F103

C6T6

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



OSLON_DTRL_R board AN4549

20/24 DocID026614 Rev 2

Appendix B OSLON_DTRL_R board

Figure 16. OSLON_DTRL_L and STEVAL-ILL048V1 assembl y

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).

DocID026614 Rev 2 21/24

AN4549 OSLON_DTRL_R board

24

Figure 17. OSLON_DTRL_R board schematic

Figure 18. OSLON_DTRL_R board layout and components placement (top)

Table 7. OSLON_DTRL_R component list

Qty Component Description Package Part-Number MFR

1 F1 fuse 1206 1206SFF075F/63-2 Littlefuse

1 R1 resistor 0603

1 RT1 47k NTC 0603 NCP18WB473J03RB Murata

1 CON1Strip

connectorSIL8 SMD

12 D1…D12 White LEDs custom LUW H9QPOSRAM

Opto

CON1

CON8

12345678

D1

LED

D2

LED

D3

LED

D4

LED

D5

LED

D8

LED

D9

LED

D10

LED

D11

LED

D12

LED

0

F1

0.75A

t

RT1

47k

R1

N.M.

JP1

JUMPER 3

1 3

2

TP1

T POINT R

TP2

T POINT R

TP3

T POINT R

TP4

T POINT R

TP5

T POINT R

TP6

T POINT R

TP9

T POINT R

TP10

T POINT R

TP11

T POINT R

TP12

T POINT RTP13

T POINT R

ESD SHIELD

D6

LED

D7

LED

TP7

T POINT R

TP8

T POINT R

OSLON_DTRL_R board AN4549

22/24 DocID026614 Rev 2

Figure 19. OSLON_DTRL_R board layout and components placement (bottom)

DocID026614 Rev 2 23/24

AN4549 Revision history

24

5 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.

AN4549

24/24 DocID026614 Rev 2

IMPORTANT NOTICE – PLEASE READ CAREFULLY

STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.

Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products.

No license, express or implied, to any intellectual property right is granted by ST herein.

Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.

ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.

Information in this document supersedes and replaces information previously supplied in any prior versions of this document.

© 2015 STMicroelectronics – All rights reserved

Documents

Home - STMicroelectronics - AN4549 Application note€¦ · Manual assignment of the COM port is also possible via the “Select COM” button. Figure 4 ... SW3, JP4, JP5 or JP6: