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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | TL494 Pulse-Width-Modulation Control Circuits datasheet (Rev. I) | PDF | HTML | 2022/7/8 | ||
| 應用說明 | Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) | 2019/3/12 | ||||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 技術文章 | Using error amplifiers to remove error and variance | PDF | HTML | 2016/2/16 | |||
| 應用說明 | Isolated Multiple Output Flyback Converter Design Using TL494 | 2014/6/18 | ||||
| 應用說明 | Designing Switching Voltage Regulators With the TL494 (Rev. E) | 2005/7/26 | ||||
| 應用說明 | Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters | 2000/3/22 | ||||
| 應用說明 | Understanding Buck Power Stages In Switchmode Power Supplies | 1999/3/4 | ||||
| 應用說明 | Understanding Boost Power Stages In Switchmode Power Supplies | 1999/3/4 |
設計與開發
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TIDA-01426 — 利用低壓 DC 電源產生線路 AC 電壓且可用於感測器勵磁的參考設計
本參考設計展示工程師如何透過分立元件實現可用於火焰檢測的高壓信號產生方案。此設計著重實現低 BOM 成本與小型化解決方案尺寸。採用推拉轉換器拓撲結構，可實現寬輸入電壓範圍與快速啟動時間。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| SOIC (D) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
| PDIP (N) | 16 | Ultra Librarian |
| SOP (NS) | 16 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。