ILD4071 Datasheet, PDF (6/25 Pages) Infineon Technologies AG – LED Driver for High Power LEDs

3
Pin Configuration
3.1
Pin Assignment
ILD4071
Pin Configuration
VREC 1
ST 2
EN 3
EP
SET 4
8 SW
7 GND
6 FREQ
5 PWMI
Figure 2 Pin Configuration ILD4071
3.2
Pin Definitions and Functions
Pin Symbol
1 VREC
2 ST
3 EN
4 SET
5 PWMI
6 FREQ
7 GND
Function
Voltage Recirculation Output and Internal Supply Input;
This pin is the supply pin of the IC (see block diagram). Furthermore the cathode of the
integrated fast freewheeling diode is connected to this pin as well.
Status Output;
Open collector diagnostic output to indicate an open load failure.
Refer to Chapter 7 for more details.
Enable;
Apply logic HIGH signal to enable the device
SET Input;
Connect a low power resistor to adjust the output current.
PWM Input;
PWM signal for dimming LEDs. Connect external R and C combination to achieve an auto
PWM-dimming function with defined frequency and duty cycle.
1) internal PWM dimming function (external RC connected to GND)
2) external PWM dimming function (µC is controlling this pin)
Refer to Chapter 6 for more details.
FREQuency Select Input;
Connect external Resistor and Capacitor to GND to set the OFF-time of the switching
frequency.
Ground;
Connect to system ground.
Datasheet
6
Rev. 1.0, 2011-11-16