Sets the minimum blanking period between output pulses to prevent cross-conduction in push-pull topologies.
These provide the PWM signals. You can configure them for "Push-Pull" mode (alternating) or "Single-Ended" mode (parallel) by toggling Pin 13 (Output Control) . Common Circuit Configurations
Inverting input of Error Amplifier 2 (Current reference connection)
The TL494 is a monolithic integrated circuit designed by Texas Instruments. It is a PWM control circuit that can be used to control the output voltage of a switching power supply. The TL494 is a versatile IC that can be used in various applications, including: tl494 circuit diagram
+-------------------------------------------------------------+ | TL494 IC | | | | +------------+ +------------+ +------------+ | | | Error Amp | | Error Amp | | Reference | | | | #1 | | #2 | | Regulator | | | +-----+------+ +-----+------+ +-----+------+ | | | | | | | +---------+----------+ | 5.0V | | | v | | v [ Pin 14 (Vref)] | | +--------------+ | | | PWM Compara.| | | +-------+------+ | | | | | v | | +-------------------+ +------------------+ | | +->| Pulse-Steering | | Oscillator | | | | | Flip-Flop | | (RT/CT Blocks) | | | | +--------+----------+ +---------+--------+ | | | | | | | | v | | | | +-------------------+ | | | | | Output Transistors| | | | | | (Q1 and Q2) | | | | | +--------+----------+ | | | | | | | | +-----------+---------------------------+ | +-------------------------------------------------------------+
An onboard regulator supplies a clean, temperature-compensated 5V reference output (Pin 14) to power external biasing networks.
He used the Dead-Time Control (DTC) pin to ensure that the power transistors didn't turn on at the same time and cause a fiery disaster. Sets the minimum blanking period between output pulses
Non-inverting input of Error Amplifier 1 (Voltage feedback monitoring)
To ensure your TL494 circuit functions reliably, keep these points in mind:
The two error amplifiers make the TL494 an excellent choice for a sophisticated battery charger that requires both constant current (CC) and constant voltage (CV) regulation. He used the Dead-Time Control (DTC) pin to
The TL494 is a versatile, industry-standard Pulse Width Modulation (PWM) control integrated circuit (IC) introduced by Texas Instruments. It houses all the functions required for the construction of a pulse-width-modulation control circuit on a single chip. Primarily designed for power-supply control, this flexible device allows engineers and hobbyists to build switch-mode power supplies (SMPS), DC-to-DC converters, inverter circuits, and motor controllers.
A typical application is an MPPT (Maximum Power Point Tracking) solar charge controller, where the TL494 forms the core of the buck converter for efficient battery charging.
fout=12×(RT×CT)f sub o u t end-sub equals the fraction with numerator 1 and denominator 2 cross open paren cap R sub cap T cross cap C sub cap T close paren end-fraction Typical values range from RTcap R sub cap T CTcap C sub cap T Dead-Time Control (DTC) Circuit
Below is a standard application schematic for a TL494 configured in . This setup is commonly used to drive an inverter transformer or an SMPS isolation stage.