Sets the maximum dead-time percentage to protect switching transistors.
Understanding the TL494 circuit diagram, its internal architecture, and pin configurations allows engineers and hobbyists to design highly efficient and stable power delivery systems. 1. TL494 Internal Architecture and Core Functions
: Two high-gain amplifiers (pins 1, 2 and 15, 16) are used to monitor output voltage and current for feedback control.
An extensive guide to understanding, designing, and troubleshooting power electronics circuits using the classic TL494 Pulse-Width Modulation (PWM) control IC.
Non-inverting input of Error Amplifier 1 (Voltage feedback monitoring) tl494 circuit diagram
Below is a comprehensive overview of the TL494, including its pinout, functional blocks, and a typical circuit design. 1. TL494 Pin Configuration The TL494 comes in a 16-pin package (SOP-16/DIP-16). iFuture Technology 1-IN+ (Pin 1): Non-inverting input of Error Amplifier 1. 1-IN- (Pin 2): Inverting input of Error Amplifier 1. 2-IN- (Pin 15): Inverting input of Error Amplifier 2. 2-IN+ (Pin 16): Non-inverting input of Error Amplifier 2. Feedback (Pin 3): Common feedback output of error amplifiers. DTC (Pin 4): Dead Time Control comparator input (sets minimum off-time). CT (Pin 5): External capacitor for oscillator frequency set. RT (Pin 6): External resistor for oscillator frequency set. GND (Pin 7): Ground reference. C1/E1 & C2/E2 (Pins 8, 9, 10, 11): Collectors and Emitters for Output Transistors 1 & 2. VCC (Pin 12): Supply voltage (7V to 40V). VREF (Pin 14): 5V Reference output (±5% precision). OUTPUT CTRL (Pin 13): Selects parallel (0V) or push-pull (VREF) operation. 2. Functional Block Diagram
+12V (Transformer Center Tap) │ ┌─────┴─────┐ T1 T1 Primary1 Primary2 ┌─────┴─────┐ │ │ Drain Drain ┌───┴───┐ ┌───┴───┐ Gate ───┤ N-FET1│ │ N-FET2├─ Gate └───┬───┘ └───┬───┘ Source Source │ │ GND ──────────────────────────┴───────────┴─────────────────────────── GND TL494 Drive Config: Pin 13 (Output Ctrl) ───> Pin 14 (+5V REF) [Enables Push-Pull Mode] Pin 9 (E1) ────────────> 100-Ohm Resistor ───> Gate of N-FET1 Pin 10 (E2) ────────────> 100-Ohm Resistor ───> Gate of N-FET2 Pin 8 (C1) & Pin 11 (C2) ──> Connected directly to +12V VCC Design Highlights for Push-Pull Configuration
If you need 24V from a 12V battery, use this .
Inverting input to the second error amplifier (usually current sensing). IN+ (Error Amp 2) Non-inverting input to the second error amplifier. 3. Core TL494 Sub-Circuits Explained Sets the maximum dead-time percentage to protect switching
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A dedicated pin adjusts the chip operation mode. It switches between push-pull alternate-mode output and parallel single-ended output. 2. Pin Configuration and Descriptions
Before wiring a TL494 circuit, you must understand how its internal blocks interact to regulate power.
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Mode Select: Ground for single-ended/parallel; VREF for push-pull Internal 5.0V regulated reference output 15 Inverting input of Error Amplifier 2 16 Non-inverting input of Error Amplifier 2 2. Core Functional Blocks Explained
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:
Understanding the TL494 circuit diagram requires a deep dive into its internal structure, pin configurations, and operational parameters. This article provides a comprehensive overview of how to build, optimize, and troubleshoot circuits utilizing this versatile integrated circuit. 1. TL494 Pinout and Internal Architecture