ILD4071 Datasheet, PDF (12/25 Pages) Infineon Technologies AG – LED Driver for High Power LEDs

ILD4071
Enable, Dimming Function and Thermal Protection
6
Enable, Dimming Function and Thermal Protection
6.1
Description
Enable function:
A logic high signal on the EN pin turns the device on. A logic low signal on enable pin EN brings the device in sleep
mode. The current consumption is typ. 0.1µA in this case. The EN pin has an internal pull down resistor which
ensures that the IC is in sleep mode and the power stage is switched off in case the pin EN is externally not
connected.
Dimming function:
The PWMI pin combines two functions:
1) PWM dimmming via a µC (3.3Vand 5V µC)
2) Integrated PWM dimming engine for standalone solutions in decentralized light module (frequency and duty
cycle adjustable via external R,C network)
A detailed description of the PWMI pin is displayed in Figure 4 below.
V_PWMI
V_PWMI,OFF
V_PWMI,ON
PWMI OFF Æ DC=0%
Internal PWM
PWMI ON Æ DC=100%
SW-
ON
SW - OFF
SW-
ON
SW - OFF
SW-
ON
SW - OFF
SW-
ON
SW - OFF
t
Figure 4 PWMI Pin description
Datasheet
12
Rev. 1.0, 2011-11-16