Description:
The TL494 device incorporates all the functions required in the construction of the pulse-width modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, this device offers the flexibility to tailor the power-supply control circuitry to a specific application.
The TL494 device contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision regulator, and output-control circuits.
The error amplifiers exhibit a common-mode voltage range from –0.3 V to VCC – 2 V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator can be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it can drive the common circuits in synchronous multiple-rail power supplies.
Desktop PCs
Microwave Ovens
Power Supplies: AC/DC, Isolated, With PFC, > 90 W
Server PSUs
Solar Micro-Inverters
Washing Machines: Low-End and High-End • E-Bikes
Power Supplies: AC/DC, Isolated, No PFC,
Power: Telecom/Server AC/DC Supplies: Dual Controller: Analog
Smoke Detectors
Features:
Output Voltage: 40 V (Max)
Output Current: 200 mA (Max)
Switching Frequency: 300 KHz
Synchronous Pin: No
Duty Cycle (Max): 45 % (Typ)
Rise Time: 100 ns
Fall Time: 40 ns
Maximum Operating Temperature: 70 C
Minimum Operating Temperature: 0 C
Packaging: Tube
Pinouts:
1. 1IN+: Noninverting input to error amplifier 1
2. 1IN-: Inverting input to error amplifier 1
3. FEEDBACK: Input pin for feedback
4. DTC: Dead-time control comparator input
5. CT: Capacitor terminal used to set the oscillator frequency
6. RT: Resistor terminal used to set the oscillator frequency
7. GND: Ground Pin
8. C1: The collector terminal of BJT output 1
9. E1: The emitter terminal of BJT output 1
10. E2: The emitter terminal of BJT output 2
11. C2: The collector terminal of BJT output 2
12. VCC: Positive Supply
13. OUTPUT CTRL: Selects single-ended/parallel output or push-pull operation
14. REF: The 5-V reference regulator output
15. 2IN-: Inverting input to error amplifier 2
16. 2IN+: Noninverting input to error amplifier 2