Connect the combined Emitter terminals (Pin 9 - E1, and Pin 10 - E2) to the base terminal of a high-power TIP31 NPN bipolar junction transistor or an equivalent NPN power switch profile. Connect a
The operational switching frequency is calculated based on the output configuration: Push-Pull Application: Design Guideline: RTcap R sub cap T values should stay between CTcap C sub cap T values should stay between B. Output Mode Configurations
By mastering the TL494's pinout, internal block diagram, and working principles, you unlock the ability to create efficient and reliable power electronics for a vast array of applications. Whether you are looking to build a bench power supply, a car audio amplifier power supply, or a solar inverter, the TL494 remains a powerful and cost-effective solution. As you explore the various "TL494 circuit diagrams" available online, you will find that a solid grasp of its core concepts will be your greatest tool in bringing your power supply designs to life.
If you are driving large MOSFETs at high frequencies, the TL494 might get warm. Consider using a dedicated gate driver IC between the TL494 and your MOSFETs.
The is a popular fixed-frequency, current-mode Pulse Width Modulation (PWM) controller IC designed primarily for power supply control, such as step-down switching regulators, buck/boost converters, and inverters. It provides all necessary functionality on a single chip, including an oscillator, error amplifiers, dead-time control, and a 5V reference regulator. Typical TL494 Circuit Components tl494 circuit diagram
The DTC pin ensures efficient switching by managing dead time to prevent shoot-through in push-pull topologies. Common Applications
The key to mastering any TL494 circuit diagram lies in tracing how these pins interact. For example, the (pins 1-2 and 15-16) are the brain, the oscillator (pins 5-6) is the heartbeat, and the output transistors (pins 8-11) are the muscles that drive external power switches.
By understanding the core principles and the function of each pin, you are no longer just reading circuit diagrams—you are engineering solutions with one of the most versatile PWM controllers ever created.
Compare feedback voltage to the reference to adjust PWM. Connect the combined Emitter terminals (Pin 9 -
. Operating at higher voltages increases internal power dissipation, which may require localized PCB copper pours for thermal management. Keep the timing components (
This is a practical power supply circuit: 12V to 5V @ 2A.
An onboard regulator supplies a clean, temperature-compensated 5V reference output (Pin 14) to power external biasing networks.
(Reference exact pin numbers/labels to the TL494 datasheet for the package variant you use.) Whether you are looking to build a bench
A Buck converter steps down a higher DC voltage to a lower one. This is one of the most fundamental DC-DC converter topologies. The TL494 drives a single MOSFET switch, an inductor, and a diode to achieve this.
Tie Pin 13 (OUTPUT CTRL) directly to Pin 7 (GND). This forces the internal steering flip-flop into Single-Ended operation mode. This configuration allows both internal output transistors (Pins 8/9 and 10/11) to switch in parallel, doubling the current handling capability. Connect both Collector pins (Pin 8 - C1, and Pin 11 - C2) together to the main VCCcap V sub cap C cap C end-sub
TL494 resistors of output signals - Power management forum - TI E2E
In an inverter circuit, E1 and E2 alternate driving two external power MOSFETs (such as IRFZ44N). These MOSFETs toggle current rapidly through a center-tapped transformer, stepping up a low DC voltage (like a 12V car battery) into a high AC voltage.
The TL494 features two internal operational amplifiers whose outputs are logically ORed together.
This pinout provides the foundation for all TL494-based designs.