TL494CN SMPS Controller

The TL494CN is a pulse-width-modulation control circuit. It incorporates all the functions required in the construction of a pulse-width-modulation (PWM) control circuit on a single chip. Designed primarily for power-supply control, the TL494CN offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494CN 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. It provides for push-pull or single-ended output operation, which can be selected through the output-control function.

TL494CN absolute maximum ratings: (1)VCC Supply voltage: 41 V MAX; (2)VI Amplifier input voltage: VCC + 0.3 V max; (3)VO Collector output voltage: 41 V max; (4)IO Collector output current: 250 mA max; (5)θJA Package thermal impedance:D package: 73℃/W max; DB package℃/W max: 82; N package 67 ℃/W max; NS package: 64℃/W max; PW package: 108℃/W max; (6)Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: 260 ℃ max; (7)Tstg, Storage temperature range: –65 to 150 ℃.

TL494CN features: (1)Complete PWM Power-Control Circuitry; (2)Uncommitted Outputs for 200-mA Sink or Source Current; (3)Output Control Selects Single-Ended or Push-Pull Operation; (4)Internal Circuitry Prohibits Double Pulse at Either Output; (5)Variable Dead Time Provides Control Over Total Range; (6)Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance; (7)Circuit Architecture Allows Easy Synchronization.