Tl494 Ltspice -

Purpose: verify startup, soft‑start and current‑limit.

: A common source for unofficial but functional models.

Before you can simulate the TL494 in LTspice, you need a functional SPICE model. Unfortunately, Texas Instruments (the primary manufacturer of the TL494) does not provide an official LTspice model. As a TI representative has explicitly stated: “We do not support LTSpice. Such effort is on your own. We support PSpice for TI and TINA TI.”

By following these guidelines, you can effectively use the TL494 in LTspice for a wide range of power electronics simulation tasks.

.tran 0 5m 0 1u .ic V(OUT_FB)=0 .probe .backanno .end tl494 ltspice

A common model can be found on sites like GitHub or electronics forums.

Master Guide to Simulating the TL494 PWM Controller in LTspice

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

120 kHz=1.2RT×CT120 kHz equals the fraction with numerator 1.2 and denominator cap R sub cap T cross cap C sub cap T end-fraction Choosing a standard capacitor value for Purpose: verify startup, soft‑start and current‑limit

Power supply clamps VCC_IN 12 0 DC 0 E_VCC 100 0 VALUE V(12,9) R_VCC 100 0 1MEG

Click the button (the running person icon) and probe the following key nodes to ensure the TL494 model behaves like the physical silicon:

: Most available models are "idealized." They may not perfectly capture thermal drift or the exact propagation delays found in the physical silicon. Rating: 4.5/5

Connect to GND for minimum dead time, or to a small voltage to set a specific dead time. We support PSpice for TI and TINA TI

Let's verify the model by building a simple open-loop Buck converter.

For , the internal flip-flop divides the frequency by two for each output stage:

: A pulse-steering flip-flop that enables either push-pull or single-ended operation. Simulating in LTspice