UC28025
- Peak Current Mode, Average Current Mode, or Voltage Mode (With FeedForward) Control Methods
- Practical Operation Up to 1 MHz
- 50-ns Propagation Delay to Output
- ±1.5-A Peak Totem Pole Outputs
- 9-V to 30-V Nominal Operational Voltage
- Wide Bandwidth Error Amplifier
- Fully Latched Logic With Double Pulse Suppression
- Pulse-by-Pulse Current Limiting
- Programmable Maximum Duty Cycle Control
- Undervoltage Lockout With Hysteresis
- Trimmed 5.1-V Reference With UVLO
- Same Functionality as UC3823 and UC3825
The UC28023 and UC28025 are fixed-frequency PWM controllers optimized for high-frequency switched-mode power-supply applications. The UC28023 is a single output PWM for single-ended topologies while the UC28025 offers dual alternating outputs for double-ended and full bridge topologies.
Targeted for cost-effective solutions with minimal external components. UC2802x devices include an oscillator, a temperature compensated reference, a wide bandwidth error amplifier, a high-speed current-sense comparator, and high-current, active-high, totem-pole outputs to directly drive external MOSFETs.
Protection circuitry includes a current limit comparator with a 1-V threshold, a TTL compatible shutdown port, and a soft-start pin which doubles as a maximum duty-cycle clamp. The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output. An undervoltage lockout section with 800 mV of hysteresis assures low start-up current. During undervoltage lockout, the outputs are high impedance. Propagation delays through the comparators and logic circuitry have been minimized while maximizing bandwidth and slew rate of the error amplifier.
Devices are available in the industrial temperature range of –40°C to 105°C. Package offerings are 16-pin SOIC (DW), or 16-pin PDIP (N) packages.
技術資料
| 種類 | タイトル | 最新の英語版をダウンロード | 日付 | |||
|---|---|---|---|---|---|---|
| * | データシート | UC2802x Economy High-Speed PWM Controller データシート (Rev. G) | PDF | HTML | 2016年 12月 9日 | ||
| セレクション・ガイド | 電源 IC セレクション・ガイド 2018 (Rev. R 翻訳版) | 英語版 (Rev.R) | 2018年 9月 13日 | |||
| アプリケーション・ノート | U-110 1.5 Mhz Current Mode IC Controlled 50-Watt Power Supply | 1999年 9月 5日 |
設計および開発
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UC28025 TINA-TI Average Reference Design
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| PDIP (N) | 16 | Ultra Librarian |
| SOIC (DW) | 16 | Ultra Librarian |
購入と品質
- RoHS
- REACH
- デバイスのマーキング
- リード端子の仕上げ / ボールの原材料
- MSL 定格 / ピーク リフロー
- MTBF/FIT 推定値
- 使用原材料
- 認定試験結果
- 継続的な信頼性モニタ試験結果
- ファブの拠点
- 組み立てを実施した拠点