TLD5085EJ_15 Datasheet, PDF (11/19 Pages) Infineon Technologies AG – 1.8A DC/DC Step-Down Converter

Infineon® LITIX™ Power
TLD5085EJ
Enable, Thermal Shutdown and PWM Dimming Function
Confidential
6
Enable, Thermal Shutdown and PWM Dimming Function
6.1
Description
Enable Function
With the enable pin (EN) the device can be set in off-state reducing the current consumption to typ. 0.1µA. The
enable function features an integrated pull down resistor which ensures that the IC is shut down and the power-
switch is off in case the pin EN is not connected.
Device Wake Up Behavior
The device initialization is triggered either by the EN voltage level crossing the turn-on threshold, rising supply
voltage (during EN=H), and also when the device restarts after a thermal shutdown. The softstart ramp starts
after the BDS external capacitor is charged.
Overtemperature Behaviour
The integrated thermal shutdown function turns the power-switch off in case of overtemperature. The typ. junction
shutdown temperature is 175°C, with a min. of 150°C. After cooling down the IC will automatically restart
operation. The thermal shutdown is an integrated protection function designed to prevent IC destruction when
operating under fault conditions. It must not be used for normal operation.
PWM Dimming Function
The PWMI signal directly controls the gate driver of the integrated power-switch by overriding the internal control
signals.
Data Sheet
13
Revision 1.1
2015-03-10