NCP1308中文资料控制器，空转准谐振电流模式数据手册ONSEMI规格书

描述 Description

The NCP1308 combines a true current mode modulator and a demagnetization detector to ensure full borderline/Critical Conduction Mode in any load/line conditions and minimum drain voltage switching (Quasi-Resonant operation). Due to its inherent skip cycle capability, the controller enters burst mode as soon as the power demand falls below a predetermined level. As this happens at low peak current, no audible noise can be heard. An internal 10us timer prevents the free-run frequency to exceed a high frequency (therefore below the 150kHz CISPR-22 EMI starting limit), while the skip adjustment capability lets the user select the frequency at which the burst foldback takes place. The Dynamic Self-Supply (DSS) drastically simplifies the transformer design in avoiding the use of an auxiliary winding to supply the NCP1308. This feature is particularly useful in applications where the output voltage varies during operation (e.g. battery chargers). Thanks to its high-voltage technology, the IC is directly connected to the high-voltage DC rail. As a result, the short-circuit trip point is not dependent upon any VCC auxiliary level.The transformer core reset detection is done through an auxiliary winding which, brought via a dedicated pin. If an OVP has been detected on the Vcc pin, the IC permanently latches-off.Finally, the continuous feedback signal monitoring implemented with an over-current fault protection circuitry (OCP) makes the final design rugged and reliable.

特性 Features

FreeRunning Borderline/Critical Mode QuasiResonant Operation
CurrentMode with Adjustable Skip Cycle Capability
Dynamic SelfSupply Type of VCC
AutoRecovery Overcurrent Protection
Improved UVLO for VCC below 10 VDevice Package Shipping
Latching Overvoltage Protection on VCC
500 mA Peak Current Source/Sink Capability
Internal 1.0 ms SoftStart
Internal 10 us Minimum TOFF
Adjustable Skip Level
Internal Temperature Shutdown
Internal Leading Edge Blanking
Direct Optocoupler Connection
SPICE Models Available for TRANsient Analysis
This is a PbFree Device

应用 Application

ACDC Adapters for Notebooks, etc.Offline Battery ChargersConsumer Electronics (DVD Players, SetTop Boxes, TVs, etc.)Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

简介

NCP1308属于集成电路（IC）的ACDC转换器离线开关。由制造生产的NCP1308AC DC 转换器，离线开关该系列是元器件级控制产品，用于构建将交流市电转换为直流电（通常电压大幅降低）的设备。集成和未集成系统主要开关元件的器件均包括在内。由于高输入输出电压比，以及此类系统中通常需要隔离，这些器件通常与外部变压器配合使用。尽管通常使用定制变压器来实现此用途，但也有许多专门用于此用途的库存产品，请参见“开关转换器，SMPS 变压器”标题。