onsemi NCP107x离线开关
安森美半导体NCP1075、NCP1076、NCP1077和NCP1079增强型离线开关具有高性能，可实现高效可靠的电源应用。NCP107x开关集成了固定频率电流模式控制器以及700V MOSFET。NCP107x采用行业标准PDIP-7封装的两种不同引出线配置，具有很高的集成度，包括软启动、频率抖动、短路保护、跳频循环模式、最大峰值电流设定点、斜坡补偿以及无需辅助绕组的动态自供电源 (DSS)。 与其他单片解决方案不同，NCP107x开关在额定负载下工作时非常安静。NCP107x开关在65kHz或100kHz频率下工作。当输出功率需求减小时，该开关会自动进入频率折返模式，并在轻负载下具有出色的效率。当功率需求进一步减小时，NCP107x会进入跳跃模式，从而将待机功耗降至空载状态。 NCP1075、NCP1076、NCP1077和NCP1079开关具有各种保护功能。这些保护功能包括一个可检测过载或短路事件的定时器，以及具有自动恢复功能的过电压保护。交流输入线路电压检测可防止在低输入电压条件（欠压）以及输入线路过高（交流线路过压保护）的条件下出现致命失控。另外，过功率保护可补偿高输入电压条件下的所有内部延迟，并优化最大输出电流能力。为提高待机性能，通过连接辅助绕组可以停止DSS运行，并有助于将高线路输入功耗降到50mW以下。
Unlike other monolithic solutions, the NCP107x Switcher is quiet by nature: during a nominal load operation. The NCP107x switches at one of the available frequencies (65kHz or 100kHz). When the output power demand diminishes, the Switcher automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, the NCP107x enters into a skip mode to reduce the standby consumption down to a no-load condition.
The onsemi NCP1075, NCP1076, NCP1077, and NCP1079 Switchers feature various protection features. These protection features include a timer to detect an overload or a short-circuit event and Over-voltage Protection with auto-recovery. AC input line voltage detection prevents lethal runaway in low input voltage conditions (brown-out) and too high an input line (AC line over-voltage protection). This feature also allows over-power protection to compensate for all internal delays in high input voltage conditions and optimize the maximum output current capability. For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consumption below 50mW at the high line.
特性
- Integrated 700V MOSFET
- Current-mode fixed-frequency operation:
- 65kHz and 100kHz (A Versions)
- 130kHz (B Versions)
- Adjust output current protection based on output power demand
- Skip-cycle operation at low peak current
- Dynamic Self-Supply (DSS)
- Auto-recovery output short circuit protection with timer-based detection
- Frequency foldback operation
- Improved efficiency at light load / improved EMI over the entire load
- 300µA no-load power consumption
- Frequency jittering (including during frequency foldback mode)
- Adjustable brown-out protection and OVP
- Overpower protection
- 2nd level current protection
应用
- Auxiliary and standby power supply
- Major appliance power supplies
- Low to medium power chargers and adapters
- White goods and home appliances
- E-Meters
- Industrial auxiliary power supply
- Consumer equipment power supply
Pin Connections
