宽输入范围同步降压控制器具有模拟电流监控器 Wide Input Range Synchronous Buck Controller with Analog Current Monitor
The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
LM25117QPSQX/NOPB TI 德州仪器 | 当前型号 | 当前型号 |
LM25117QPSQ/NOPB 德州仪器 | 类似代替 | LM25117QPSQX/NOPB和LM25117QPSQ/NOPB的区别 |
LM25117QPSQE/NOPB 德州仪器 | 类似代替 | LM25117QPSQX/NOPB和LM25117QPSQE/NOPB的区别 |