12V Automotive LED Driver IC TLD2141-3EP LITIX™ Basic+ Dimming via PWMI with STOP/TAIL Function

Open online SPICE simulator circuit link: atv_12v_LED_lighting_driver_TLD2141-3EP_PWM_diming_STOPTAIL_function_V1.TSC


12V Automotive LED Driver IC TLD2141-3EP LITIX™ Basic+
Dimming via PWMI with STOP/TAIL function

- Change simulation time:
"Analysis->Transient: Start - End Display"
- Double click on the green window to enter design criteria
- Click on "Run" and Simulate Transient

The LITIX™ Basic+ TLD2141-3EP is a triple channel high-side driver IC with
integrated output stages. It is designed to control LEDs with a current up to 80
mA. In typical automotive applications the device is capable of driving 3 red
LEDs per chain (total 9 LEDs) with a current up to 60 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 the device is controlled in
PWM mode by VTAIL signal with a frequency of 250Hz and a Duty Cycle of 10%.
When VSTOP signal is activated, the PWM engine is turned-OFF by pulling-down
the PWMI pin. During this time, the output channels are fully ON.
For more information, please consult Application information section from datasheet.

The Ambient temperature of the entire chip can be set from VTAMB voltage source.
Junction temperature can be monitored on TJ output pin.
TJ is always TAMB + temperature due to self-heating of the device considering
the main sources of power dissipation (power device, logic, internal regulator).

Thermal model description:
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

{ Please double click here to enter design criteria }

{ Number of Thermal Model }
THERMAL_MODEL := 1;

{=== How to change SPICE convergence parameters ===}

Change the convergence-speed-accuracy trade-off with "Analysis -> Analysis Parameters..."
1) How to improve Accuracy
To speed up the simulation, the TR maximum time step [s] can be adjusted (default value = 10Gs).
- high values may produce less accuracy during signal transition
- a general rule is to have the ratio between test duration (End display) and TR maximum time step
in the range of 1k to 10k
2) How to improve Convergence
The SPICE model is not guaranteed to converge in every test situation with the default simulator settings.
Increasing gradually the following analysis parameters may help achieving the convergence:
Important: exceeding indicated values may impact results accuracy.
- DC absolute current error [A] from 1n (default) to 10n
- DC absolute voltage error [V] from 1u (default) to 10u
- DC relative error [%] from 1m (default) to 10m


Product info: TLD2141-3EP
Evaluation Boards: BASICPLUS DEMOBOARD
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