TLD5045EJ_15 Datasheet, PDF (13/30 Pages) Infineon Technologies AG – 700mA High Integration - DC/DC Step-Down Converter

Infineon® LITIX™ Power
TLD5045EJ
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. 0.1 µA 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 (3.3V and 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 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 6-1 PWMI Pin Description
Data Sheet
13
Revision 1.0
2015-05-28