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UCC28740隔离式反激电源控制器使用光耦合器来提供恒定电压（CV），从而改善对大型负载阶跃的瞬态响应。恒流（CC）调节通过一次侧稳压（PSR）技术来实现。此器件处理光耦合反馈信息和来自辅助反激式绕组的信息，以实现对输出电压和电流的精准高性能控制。
内部采用700V启动开关，可动态控制工作状态并定制调制配置文件，支持超低待机功耗，并且不会影响启动时间或输出瞬态响应。
UCC28740中的控制算法使得运行效率满足或者超过适用标准。驱动输出接至一个MOSFET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100kHz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。特性有助于抑制一次侧和二次侧应力分量.170Hz的最小开关频率可轻松实现低于10mW的的无负载功耗。
| 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) |
| UCC28740 | LM5023 | UCC28600 | UCC28610 | UCC28700 | UCC28704 | UCC28710 | UCC28720 | UCC28722 | UCC28742 | UCC28780 |
|---|---|---|---|---|---|---|---|---|---|---|
| Current | Current | Current | Current | Current | Current | Current | Current | Current | Current | Current |
| 99 | 100 | 99 | 100 | 99 | 99 | 99 | 99 | 99 | 99 | 99 |
| 100 | 130 | 130 | 130 | 132 | 85 | 100 | 80 | 80 | 105 | 1000 |
| 21/7.75 | 12.8/7.5 | 10.3/9.3 | 10.2/8 | 21/8.1 | 21/7.7 | 21/8 | 21/7.7 | 21/7.7 | 22/7.7 | 17.5/10 |
| SSR HV Start-up CV/CC Control DCM Smart Meters Compatible IoT Compatible USB Type-C Compatible Power Delivery Compatible | SSR HV Start-up Configurable QR/TM Green Mode Light Load Efficiency Power Delivery Compatible | SSR QR/TM Error Amplifier Green Mode Light Load Efficiency Power Delivery Compatible Motor Drive Compatible Audio Compatible | DCM SSR HV Start-up Soft Switching Power Delivery Compatible Audio Compatible Motor Drive Compatible | PSR Adjustable CBC CV/CC Control DCM Power Delivery Compatible | 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 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 BJT Switch Adjustable CBC CV/CC Control DCM Smart Meters Compatible IoT Compatible Power Delivery Compatible | SSR DCM Smart Meters Compatible IoT Compatible Power Delivery Compatible | Zero Voltage Switching Active Clamp Flyback |
| -40 to 125 | -40 to 125 | -40 to 105 | -40 to 125 | -20 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 | -40 to 125 |
| SOIC | VSSOP | SOIC | PDIP SOIC | SOT-23 | SOT-23 | SOIC | SOIC | SOT-23 | SOT-23 | SOIC WQFN |
| Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog | Catalog |
| 7SOIC: 29 mm2: 6 x 4.9(SOIC) | 8VSSOP: 15 mm2: 4.9 x 3(VSSOP) | 8SOIC: 29 mm2: 6 x 4.9(SOIC) | See datasheet (PDIP) 8SOIC: 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) | 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) | 6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23) | 16SOIC: 59 mm2: 6 x 9.9(SOIC) 16WQFN: 9 mm2: 3 x 3(WQFN) |
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