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The TL494 is a staple in various power management solutions, including: Desktop PCs and Servers : Providing regulated power to internal components. Solar Inverters
| Pin No. | Name | Function | | :------ | :------------- | :------------------------------------------------------------------------------------------------------------------------------------ | | 1 | 1IN+ | Non-inverting input of Error Amplifier 1. Used for voltage or current feedback. | | 2 | 1IN- | Inverting input of Error Amplifier 1. Can be connected to the 5V reference to set a target voltage. | | 3 | FEEDBACK | Output of the error amplifiers, connected to the PWM comparator. Used for frequency compensation with an RC network. | | 4 | DTC | Dead-Time Control input. Applying 0V to 3.3V here sets the minimum dead time from 0% to nearly 50% of the period. | | 5 | CT | Timing Capacitor connection. Connected to ground via a capacitor to set oscillator frequency. | | 6 | RT | Timing Resistor connection. Connected to ground via a resistor to set oscillator frequency. | | 7 | GND | Ground reference for the IC. | | 8 | C1 | Collector of Output Transistor 1. | | 9 | E1 | Emitter of Output Transistor 1. | | 10 | E2 | Emitter of Output Transistor 2. | | 11 | C2 | Collector of Output Transistor 2. | | 12 | Vcc | Positive power supply for the IC. Operating range is 7V to 40V DC. | | 13 | OUTPUT CTRL | Output mode control. Ground for single-ended (parallel) mode; connect to +5V ref for push-pull (alternating) mode. | | 14 | REF | 5V Reference Voltage output. Capable of sourcing up to 10mA of current for external circuits. | | 15 | 2IN- | Inverting input of Error Amplifier 2. Can be used for current sensing feedback. | | 16 | 2IN+ | Non-inverting input of Error Amplifier 2. Can be connected to a reference to set a current limit. | tl494 circuit diagram
If the output voltage drifts high, the voltage at Pin 1 exceeds Pin 2. The error amplifier drives the internal PWM comparator to shrink the pulse width, restoring balance. Step 4: Driver Interface to External MOSFETs The TL494 is a staple in various power
Error Amp 1 compares the output voltage to the 5V reference. Error Amp 2 monitors voltage across a current shunt (R_shunt) for over-current protection. Used for voltage or current feedback
| Pin No. | Name | Function | |---------|------|----------| | 1 | 1IN+ | Non-inverting input of Error Amplifier 1 | | 2 | 1IN- | Inverting input of Error Amplifier 1 | | 3 | FEEDBACK | PWM comparator input (usually for output voltage control) | | 4 | DTC | Dead-Time Control (sets minimum off-time) | | 5 | CT | Timing Capacitor (sets oscillator frequency) | | 6 | RT | Timing Resistor (sets oscillator frequency) | | 7 | GND | Ground | | 8 | C1 | Collector of Output Transistor 1 | | 9 | E1 | Emitter of Output Transistor 1 | | 10 | E2 | Emitter of Output Transistor 2 | | 11 | C2 | Collector of Output Transistor 2 | | 12 | VCC | Positive supply voltage (7V to 40V) | | 13 | OUT CTRL | Output control (High = Push-Pull mode, Low = Single-ended) | | 14 | REF | 5V Precision Reference Output | | 15 | 2IN- | Inverting input of Error Amplifier 2 | | 16 | 2IN+ | Non-inverting input of Error Amplifier 2 |
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