ST ILL014V1 User Manual

STEVAL-ILL014V1

Evaluation board for the STCS1 constant current controller for high brightness LEDs

Features

■Input voltage (VIN): 4.5 V to 40 V

■Less than 0.5 V voltage overhead

■Up to 1.5 A output current

■PWM dimming pin

■Shutdown pin

■LED disconnection diagnostic

Description

The best way to power LEDs is to control the forward current in order to achieve good matching of light output. LED manufacturers specify the characteristics (such as lumens, beam pattern, color) of their devices at a specified forward current.

The STEVAL-ILL014V1 evaluation board demonstrates the operation of the STCS1 constant current LED driver. The STCS1 is capable of controlling the LED current under several application conditions, while also providing useful features that make it suitable for different applications such as advertising signs, automotive interior and exterior lighting, and emergency vehicle warning lights.

Data Brief

STEVAL-ILL014V1

May 2008	Rev 1	1/4
For further information contact your local STMicroelectronics sales office.		www.st.com

2/4

D4 BAT46

Vcc

J4

5V PWM

GND

J3

PWM

J2

5V EN GND

1

Board

.1 Figure

Board

schematic

U1

U3

2

5V

diagramSchematic

schematic

1

VOUT

3

VIN

GND

C7

Rf

100

C6

100nF, 6.3V

L7805

Cbypass

0.33uF, 50V

0.1uF,50V

0

0

5V

0

D1

LH R974

R13 180

1

J1

8

GND

1

2

5V

Vcc

Vcc

1

Vcc

DISC

3

2

7

A

2

4

K

3

PWM

SLOPE

5V

3

6

0

EN

GND

NTC

D3

2

1

4

5

10k

LUMILEDS LXHL PW09

1

DRAIN

FB

M1

Test point

2

Cslope1

J5

1

Cslope2

IN PWM

C3

STCS1A

2N7002

1uF, 50V

5V

Rsense

1

0

0.33, 1%, 0805

1nF

100nF

R15

R17

2

10k

1.8k

3

0

0

0

0

ILL014V1-STEVAL

This subcircuit is present on EVB

only if the LED is mounted.