TL494 PWM Controller Module

TL494 PWM Controller Module is a high-performance integrated circuit (IC) mounted on a compact breakout board, designed to simplify the creation of efficient switching power supplies, DC-DC converters, and motor control circuits. At the heart of this module is the industry-standard TL494 chip, which integrates all the necessary functions for a pulse-width modulation (PWM) control circuit. It features two error amplifiers, an internal reference voltage, an oscillator, and a dead-time control comparator. Engineers and DIY enthusiasts choose this module because it offers a ready-to-use solution for driving power FETs and transistors with precisely controlled duty cycles and frequencies, enabling robust and predictable power management designs.

Key Features:

• Integrated PWM Control: Utilizes the powerful TL494 IC to provide precise and stable control over the duty cycle of switching elements.
• Adjustable Output Frequency: You can easily set the oscillator frequency using an external resistor and capacitor, offering maximum design flexibility.
• Dual Error Amplifiers: The two internal error amplifiers allow for simultaneous voltage and current feedback loops, enhancing regulation accuracy.
• Dead-Time Control: A built-in dead-time control comparator gives you the ability to prevent simultaneous conduction of output transistors, which is crucial for full-bridge and half-bridge topologies.
• Output Control: The output control pin allows you to select single-ended or push-pull operation, adapting the module to various circuit needs.
• 5V Reference Output: Provides a stable 5V reference voltage (V_REF) output for external circuit use, simplifying sensor and feedback network design.

Technical Specifications:

• Controller IC: TL494
• Supply Voltage (V_CC): 7 V to 40 V
• Output Voltage (V_C): Up to 40 V
• Reference Voltage Output (V_REF): 5.0 V ±5%
• Maximum Output Current (I_O): 200 mA (Sink or Source)
• Oscillator Frequency Range: 1 kHz to 300 kHz
• Output Type: Push-Pull or Single-Ended
• Onboard Components: LED power indicator, terminals for external R and C for frequency adjustment.

Mechanical Specifications:

• Module Type: Breakout PCB for the DIP-16 TL494 IC.
• Connectors: Screw terminals for secure power and output connections; pin headers for control/feedback signals.
• Mounting Holes: Two mounting holes for easy installation into enclosures.

Dimensions:

• Board Length: ~35 mm
• Board Width: ~30 mm
• Board Height: ~15 mm (including screw terminals)

Pinout and Wiring:

• VCC: Power supply input (7V to 40V).
• GND: Ground connection.
• OUT1 / OUT2 (C1 / C2): Collector outputs for the two internal transistors. Use these to drive external power stages.
• E1 / E2: Emitter outputs for the two internal transistors (typically connected to GND in single-ended mode).
• V_REF: Stable 5V Reference Output.
• R_T / C_T: Pins for connecting the external resistor (R_T) and capacitor (C_T) to set the oscillator frequency.
• DT: Dead-Time Control pin.
• EAFB / EAIN: Non-inverting (+) and Inverting (-) inputs for Error Amplifier 1 (used for voltage regulation).
• Wiring Note: Connect VCC and GND first. Then, select your desired output frequency using the R_T/C_T terminals. Use the error amplifier inputs to feed back your output voltage or current signal for closed-loop regulation.

Datasheet Reference:

• Download TL494 Datasheet

Commonly Used in:

• Power Supply Development: The standard IC for building custom desktop computer power supplies and regulated battery chargers.
• Inverters and Converters: Essential in designing push-pull, full-bridge, or half-bridge DC-DC converters and small power inverters.
• Industrial Control: Used in isolated power delivery stages for industrial machinery and electronic equipment.

Applications:

• Regulated Switching Power Supplies: Build high-efficiency, regulated outputs for sensitive electronics.
• Battery Charging Systems: Precisely control charging current and voltage for Li-ion, lead-acid, or NiMH batteries.
• DC Motor Speed Control: Use the PWM output to vary the effective voltage to DC motors, controlling their speed and torque.
• High-Frequency Signal Generation: Create square wave signals for testing and driver circuits.

Equivalent Models:

• SG3525: A popular PWM controller IC, often favored for its built-in soft-start capability and high current output drivers.
• UC384x Series (e.g., UC3842): Current-mode PWM controllers commonly used for flyback and boost converter topologies.

Package Includes:

• 1 x TL494 PWM Controller Module