12V Automotive LED Driver IC LITIX™ Power Flex TLD5542-1QV - test bench Input Voltage Ramping

Open online SPICE simulator circuit link: atv_lighting_TLD5542-1QV_testbench_Vin_ramping.TSC

Model Parameters:

Input Voltage Ramping- Transient with TLD5542-1QV

This test bench shows how the regulator reacts to changes in the input voltage (VIN) while
the circuit is in steady state.Output current is monitored while the regulator is trying to
compensate for input voltage variaton below or above the nominal output voltage.
The load is fixed formed by 4 LEDs driven by 1A average current.

Notes:
BODY_DIODE is not a real diode but a Voltage Controlled Current Source which models the
threshold and ON/OFF states resistance. RCOMP is a placeholder for further adjustment
of the resistor for stability purpose. Keep unchanged otherwise. S2G is a virtual pin used
for monitoring short to ground fault if VFB<0.563V for at least 8 clock cycles. During start-up,
the detection is ignored until VSOFT_START>1.75V.

- Double click on the green window to enter design criteria
- Click on "Run" and Simulate Transient

- frequency: specify directly the controller frequency [200kHz to 700kHz]
MFS feature related parameters (to disable the feature for other test-benches, make t_SOMFS longer than total simulation time)
- LED_initial: number of LEDs before performing the jump; this number must be the same with the number of LEDs connected
at the output; the range is between 2 and 16
- LED_after: number of LEDs after the jump; this number must be the same with the number of LEDs that will remain connect
at the output; the range is between 1 and 15
- t_PREP: time until Ccomp is discharged; give the compensation capacitors enough time to discharge, otherwise spikes will still
appear at the output
- t_SOMFS: time when MFS routine will start; for other test benches, keep this parameter higher than simulation time to deactivate
the feature