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UCC28720反激式电源控制器在不使用光耦合器的情况下可提供隔离输出恒定电压（CV）和恒定电流（CC）输出稳压。此器件处理来自初级电源开关和一个辅助反激式绕组的信息以实现对输出电压和电流的精确控制。
一个内部700V启动开关，动态控制的工作状态和一个定制的调制配置文件在不牺牲启动时间或输出瞬态响应的同时支持超低待机功耗。
UCC28720中的控制算法使得运行效率满足或者超过适用标准。输出驱动接至一个双极晶体管电源开关。带有谷值开关的断续传导模式（DCM）减少了开关损耗。开关频率的调制和初级电流峰值振幅（FM和AM）在整个负载和线路范围内保持较高的转换效率。
此控制器有一个80kHz的最大开关频率并且一直保持对变压器内峰值初级电流的控制。保护特性有助于抑制初级和次级应力分。UCC28720可由一个外部电阻器设定为对电缆中的压降进行补偿。
| ? |
|---|
| Control Method |
| Duty Cycle (Max) (%) |
| Frequency (Max) (kHz) |
| UVLO Thresholds On/Off (V) |
| Features |
| Operating Temperature Range (C) |
| Package Group |
| Rating |
| Package Size: mm2:W x L (PKG) |
| ? |
| UCC28720 | UCC28700 | UCC28701 | UCC28702 | UCC28703 | UCC28704 | UCC28710 | UCC28711 | UCC28722 | UCC28740 | UCC28742 |
|---|---|---|---|---|---|---|---|---|---|---|
| Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? | Current ? ? |
| 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? | 99 ? ? |
| 80 ? ? | 132 ? ? | 132 ? ? | 132 ? ? | 132 ? ? | 85 ? ? | 100 ? ? | 100 ? ? | 80 ? ? | 100 ? ? | 105 ? ? |
| 21/7.7 ? ? | 21/8.1 ? ? | 21/8.1 ? ? | 21/8.1 ? ? | 21/8.1 ? ? | 21/7.7 ? ? | 21/8 ? ? | 21/8 ? ? | 21/7.7 ? ? | 21/7.75 ? ? | 22/7.7 ? ? |
| PSR HV Start-up BJT Switch Adjustable CBC CV/CC Control DCM Current Limiting Green Mode HV Start-up Input Line Monitor Leading Edge Blanking Light Load Efficiency Low Power Soft Start Smart Meters Compatible IoT Compatible Power Delivery Compatible ? ? | PSR Adjustable CBC CV/CC Control DCM Power Delivery Compatible ? ? | PSR NTC Configurable CV/CC Control DCM Power Delivery Compatible ? ? | PSR Fixed CBC NTC Configurable CV/CC Control DCM ? ? | PSR Fixed CBC NTC Configurable CV/CC Control DCM ? ? | PSR HV Start-up Configurable Fixed CBC NTC Configurable CV/CC Control DCM USB Type-C Compatible IoT Compatible Power Delivery Compatible ? ? | PSR HV Start-up Adjustable CBC CV/CC Control DCM Green Mode Input Line Monitor Leading Edge Blanking Light Load Efficiency Low Power Soft Start Smart Meters Compatible IoT Compatible Power Delivery Compatible ? ? | PSR HV Start-up NTC Configurable CV/CC Control DCM Green Mode Input Line Monitor Leading Edge Blanking Light Load Efficiency Low Power Soft Start Smart Meters Compatible IoT Compatible Power Delivery Compatible ? ? | PSR BJT Switch Adjustable CBC CV/CC Control DCM Smart Meters Compatible IoT Compatible Power Delivery Compatible ? ? | SSR HV Start-up CV/CC Control DCM Smart Meters Compatible IoT Compatible USB Type-C Compatible Power Delivery Compatible ? ? | SSR DCM Smart Meters Compatible IoT Compatible Power Delivery Compatible ? ? |
| -40 to 125 ? ? | -20 to 125 ? ? | -20 to 125 ? ? | -20 to 125 ? ? | -20 to 125 ? ? | -40 to 125 ? ? | -40 to 125 ? ? | -40 to 125 ? ? | -40 to 125 ? ? | -40 to 125 ? ? | -40 to 125 ? ? |
| SOIC ? ? | SOT-23 ? ? | SOT-23 ? ? | SOT-23 ? ? | SOT-23 ? ? | SOT-23 ? ? | SOIC ? ? | SOIC ? ? | SOT-23 ? ? | SOIC ? ? | SOT-23 ? ? |
| Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? | Catalog ? ? |
| 7SOIC: 29 mm2: 6 x 4.9(SOIC) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? | 7SOIC: 29 mm2: 6 x 4.9(SOIC) ? ? | 7SOIC: 29 mm2: 6 x 4.9(SOIC) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? | 7SOIC: 29 mm2: 6 x 4.9(SOIC) ? ? | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) ? ? |
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