OnSemiNCP107515W低功耗离线开关电源解决方案

开关电源评估板电路图,材料清单.

The NCP1072/NCP1075 products integrate a fixed frequency current mode controller with a 700 V MOSFET. Available in a PDIP 7 or SOT 223 package, the NCP1072/5 offer a high level of integration, including soft start, frequency jittering, short circuit protection, skip cycle, a maximum peak current set point, ramp compensation, and a Dynamic Self Supply (eliminating the need for an auxiliary winding).

Unlike other monolithic solutions, the NCP1072/5 is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65, 100 or 130 kHz). When the output power demand diminishes, the IC automatically enters frequency foldback mode and provides excellent efficiency at light loads. When the power demand reduces further, it enters into a skip mode to reduce the standby consumption down to a no load condition.

Protection features include: a timer to detect an overload or a short circuit event, Overvoltage Protection with auto recovery and AC input line voltage detection. For improved standby performance, the connection of an auxiliary winding stops the DSS operation and helps to reduce input power consumption below 50 mW at high line.

NCP1072/NCP1075主要特性:

Built in 700 V MOSFET with RDS(on) of 11

Large Creepage Distance Between High voltage Pins

Current Mode Fixed Frequency Operation – 65 / 100 /130 kHz (130 kHz on demand only)

Peak Current: NCP1072 with 250 mA and NCP1075 with 450 mA

Fixed Ramp Compensation

Skip Cycle Operation at Low Peak Currents Only: No Acoustic Noise!

Dynamic Self Supply: No Need for an Auxiliary Winding

Internal 1 ms Soft Start

Auto Recovery Output Short Circuit Protection with Timer Based Detection

Auto Recovery Overvoltage Protection with Auxiliary Winding Operation

Frequency Jittering for Better EMI Signature, Including Frequency Foldback Mode

No Load Input Consumption 50 mW

Frequency Foldback to Improve Efficiency at Light Load

Internal Temperature Shutdown

These are Pb Free Devices

NCP1072/NCP1075典型应用:

Auxiliary / Standby Isolated Power Supplies White Goods / Smart Meter / E Meter

图1.NCP1072/NCP1075方框图

图2.NCP1075 12V/0.85A通用输入电源电路图

15W开关电源评估板NCP1075SOTGEVB

图3.15W开关电源评估板NCP1075SOTGEVB外形图


图4.15W开关电源评估板NCP1075SOTGEVB电路图

15W开关电源评估板NCP1075SOTGEVB材料清单(BOM):

详情请见:
http://www.onsemi.cn/pub_link/Collateral/NCP1072-D.PDF