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TL494INE4 Datasheet(PDF) 1 Page - Texas Instruments |
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TL494INE4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 19 page www.ti.com FEATURES 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1IN+ 1IN− FEEDBACK DTC CT RT GND C1 2IN+ 2IN− REF OUTPUT CTRL VCC C2 E2 E1 D, DB, N, NS, OR PW PACKAGE (TOP VIEW) DESCRIPTION TL494 PULSE-WIDTH-MODULATION CONTROL CIRCUITS SLVS074E – JANUARY 1983 – REVISED FEBRUARY 2005 • Complete PWM Power-Control Circuitry • Uncommitted Outputs for 200-mA Sink or Source Current • Output Control Selects Single-Ended or Push-Pull Operation • Internal Circuitry Prohibits Double Pulse at Either Output • Variable Dead Time Provides Control Over Total Range • Internal Regulator Provides a Stable 5-V Reference Supply With 5% Tolerance • Circuit Architecture Allows Easy Synchronization The TL494 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, this device offers the flexibility to tailor the power-supply control circuitry to a specific application. The TL494 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. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 provides for push-pull or single-ended output operation, which can be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation. The TL494C is characterized for operation from 0 °C to 70°C. The TL494I is characterized for operation from –40 °C to 85°C. AVAILABLE OPTIONS PACKAGED DEVICES(1) SHRINK SMALL THIN SHRINK TA SMALL OUTLINE PLASTIC DIP SMALL OUTLINE OUTLINE SMALL OUTLINE (D) (N) (NS) (DB) (PW) 0 °C to 70°C TL494CD TL494CN TL494CNS TL494CDB TL494CPW –40 °C to 85°C TL494ID TL494IN — — — (1) The D, DB, NS, and PW packages are available taped and reeled. Add the suffix R to device type (e.g., TL494CDR). Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 1983–2005, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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