LM5021 离线式脉宽调制 (PWM) 控制器包含有实现采用电流模式控制的高效离线式单端反激/正激电源转换器所需的所有特性。 LM5021 包含超低 (25μA) 启动电流特性,可最大程度降低高压启动网络中的功耗。 跳周期模式可降低轻负载条件下的功耗,从而实现节能应用(ENERGY STAR®、CECP 等)。 附加特性包括欠压锁定、逐周期电流限制、断续模式过载保护、斜率补偿、软启动和振荡器同步功能。 这款高性能 8 引脚 IC 的总传播延迟不到 100ns,并且能够通过单个电阻设定 1MHz 的振荡器。
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| Control mode | Secondary-side regulation |
| UVLO thresholds on/off (V) | 20/7.25 |
| Duty cycle (max) (%) | 80 |
| Switching frequency (max) (kHz) | 1000 |
| Features | CCM, DCM, Frequency synchronization, Leading edge blanking, Secondary-side regulated, Skip cycle mode, Slope compensation |
| Operating temperature range (°C) | -40 to 125 |
| Rating | Catalog |
| Device type | Controllers |
| Topology | Flyback, Forward |
| PDIP (P) | 8 | 92.5083 mm² 9.81 x 9.43 |
| VSSOP (DGK) | 8 | 14.7 mm² 3 x 4.9 |