Connect Pin 13 directly to GND . Both output transistors switch simultaneously, permitting a maximum duty cycle near
LTspice excels at simulating switching waveforms and control loop responses.
By following these steps, you can fully utilize to design, debug, and optimize your TL494 -based power supply circuits effectively.
Purely idealized components cause infinite tl494 ltspice
Once your simulation runs, use LTspice’s powerful analysis tools to refine your design:
pin; they may only function in push-pull mode even when configured for parallel operation by switching the pin from cap V sub r e f end-sub to GND [3]. Waveform Overlap
If you want to move forward with your design, let me know if you need help calculating the Connect Pin 13 directly to GND
crucial for PWM! Set a small maximum timestep, such as 1u (1 microsecond) or even 100n (100 nanoseconds), to ensure the PWM pulses are accurately drawn, preventing visual artifacts in the switching waveform. 5. Analyzing Results in LTspice Once the simulation completes, you can probe the circuit:
—often found in community forums or educational repositories. Move the Subcircuit File : Place the
: Use a P-Channel MOSFET or a NPN transistor driven by the TL494's uncommitted collectors (Pins 8 and 11). you can fully utilize to design
: Tie Pin 13 directly to Ground (GND) to fire both output transistors simultaneously. 3. Setting the Minimum Dead-Time (Pin 4)
provided by the manufacturer (Texas Instruments). Designers typically rely on the following: MK Dynamics Third-Party Subcircuits : Unofficial models, such as those found on MK Dynamics or community forums like LTspice@groups.io , are commonly used. PSPICE Conversions
In LTspice, the transformer leakage and magnetizing inductance must be realistic. Add Rser=0.01 to inductors to avoid unrealistic ringing.
Place a standard independent DC voltage source ( voltage ) configured to and wire it to VCCcap V sub cap C cap C end-sub (Pin 12) and GND (Pin 7). Establish the Reference: Connect a decoupling capacitor to the VREFcap V sub cap R cap E cap F end-sub output (Pin 14) to ground. Verify it produces a stable Oscillator Setup: Wire a resistor from RTcap R sub cap T to GND, and a capacitor from CTcap C sub cap T