12V Automotive LED Driver IC TLD2252-2EP LITIX™ Basic+ Application Circuit Dimming via PWMI using STOP/TAIL function

Open online SPICE simulator circuit link: atv_12v_LED_lighting_driver_TLD2252-2EP_PWM_dimming_STOPTAIL_function.tsc


12V Automotive LED Driver IC TLD2252-2EP LITIX™ Basic+
Application circuit Dimming via PWMI with STOP/TAIL function

{ Please double click here to enter design criteria }

{ Number of Thermal Model }
THERMAL_MODEL := 1;
{ Ambient Temperature }
TAMB := 25;

The Ambient temperature of the entire chip can be set by connecting a voltage source to TAMB input pin.
Junction temperature can be monitored on TJx output pin.
TJx is always TAMB + temperature due to self-heating of power device.

The model contains 4 different Junction to Ambient thermal networks associated to different
metallization and cooling areas.
To switch between the four networks available, change the value of THERMAL_MODEL parameter which
can be found on the test bench
THERMAL_MODEL=1: P=1W; T=85°C; PCB type: 1s0p 300mm2
THERMAL_MODEL=2: P=1W; T=85°C; PCB type: 1s0p 600mm2
THERMAL_MODEL=3: P=1W; T=85°C; PCB type: 1s0p footprint
THERMAL_MODEL=4: P=1W; T=85°C; PCB type: 2s2p
where: P=power injected in chip; T=ambient temperature

Observations:
1. It is required to let the TJ pin open (no external connection)
2. The convention is 1V=1°C

- Change simulation time:
"Analysis->Transient: Start - End Display"

The LITIX™ Basic+ TLD2252-2EP is a dual channel high-side driver IC with
integrated output stages. It is designed to control LEDs with a current up to
120 mA. In typical automotive applications the device is capable of driving 3
red LEDs per chain (total 6 LEDs) with a current up to 100 mA and even above,
if not limited by the overall system thermal properties. Practically, the output
current is controlled by an external resistor or reference source, independently
from load and supply voltage changes.

This setup is showing a typical application where CH1 is controlled in PWM mode
by TAIL signal. The PWM engine is programmed with a frequecny of 250Hz and a
Duty Cycle of 25%. When STOP signal is present, PWM engine is deactivated
forcing both channels to work with 100% duty cycle, delivering maximum output
current in the LEDs.

For more information, please consult Application Information section from the datasheet.

Product Info: TLD2252-2EP

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