安森美NCP1013 5W LED驱动方案

安森美公司的NCP101x系列集成固定频率电流模式控制器和700V的MOSFET,能提供建立功能强大低功耗电源所需的一切,包括软起动,频率抖动,短路保护,跳频模式,最大峰值电流设定点和动态自供电等.本文介绍了通用输入电压(85-265VAC),采用反激式输出功率5W的单片解决方案,包括NCP101x的主要性能,电路图以及主要的设计公式.

The NCP101X series integrates a fixed-frequency current-mode controller and a 700 V voltage MOSFET. Housed in a PDIP7 package, the NCP101X offers everything needed to build a rugged and low-cost power supply, including soft-start, frequency jittering, short-circuit protection, skip-cycle, a maximum peak current setpoint and a Dynamic Self-Supply (no need for an auxiliary winding).

Unlike other monolithic solutions, the NCP101X is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65-100-130 kHz). When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at typically 1/4 of the maximum peak value, no acoustic noise takes place. As a result, standby power is reduced to the minimum without acoustic noise generation。

特性
Built-in 700V MOSFET with Typical RdsON of 11 or 22 Ohms..

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