TL494
- 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 device 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 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.
The uncommitted output transistors provide either common-emitter or emitter-follower output capability. The TL494 device 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 TL494 device is characterized for operation from 0°C to 70°C. The TL494I device is characterized for operation from –40°C to 85°C.
기술 문서
| 유형 | 직함 | 날짜 | ||
|---|---|---|---|---|
| * | Data sheet | TL494 Pulse-Width-Modulation Control Circuits datasheet (Rev. I) | PDF | HTML | 2022/07/08 |
| Application note | Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) | 2019/03/12 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 2018/06/25 | ||
| Technical article | Using error amplifiers to remove error and variance | PDF | HTML | 2016/02/16 | |
| Application note | Isolated Multiple Output Flyback Converter Design Using TL494 | 2014/06/18 | ||
| Application note | Designing Switching Voltage Regulators With the TL494 (Rev. E) | 2005/07/26 | ||
| Application note | Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters | 2000/03/22 | ||
| Application note | Understanding Boost Power Stages In Switchmode Power Supplies | 1999/03/04 | ||
| Application note | Understanding Buck Power Stages In Switchmode Power Supplies | 1999/03/04 |
설계 및 개발
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TIDA-01426 — 센서 여자를 위한 저전압 DC 소스에서 라인 AC 전압 생성을 위한 레퍼런스 디자인
| 패키지 | 핀 | 다운로드 |
|---|---|---|
| PDIP (N) | 16 | 옵션 보기 |
| SOIC (D) | 16 | 옵션 보기 |
| SOP (NS) | 16 | 옵션 보기 |
| TSSOP (PW) | 16 | 옵션 보기 |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치