描述 Description

The NCP1336 hosts a high-performance circuitry aimed to powering quasi-resonant converters. Capitalizing on anovel valley-lockout system, the controller shifts gears and reduces the switching frequency as the power loading becomes lighter. This results in a stable operation despite switching events always occurring in the drain-source valley. This system works down to the 4th valley and toggles to a variable frequency mode beyond, ensuring an excellent standby power performance. The controller takes benefit of a high-voltage start-up current source to provide a quick and lossless power-on sequence. To improve the safety in overload situations, the controller includes an Over Power Protection circuit which clamps the delivered power at high-line. Safety-wise, an adjustable timer relies on the feedback voltage to detect a fault. On version B, this fault triggers a triple-hiccup on the VCC pin which naturally reduces the average input power drawn by the converter. On version A, when a fault is detected, the controller is latched-off.Particularly well suited for adapter applications, the controller features two latch inputs: one dedicated to Over Temperature protection (OTP) which offers an easy means to connect a pull-down temperature sensor like an NTC, and a second one more classical that can be used ot performa an accurate Over voltage Protection. Finally, a brownout pin whcih stops the circuit operation in presence of a low mains condition is included.

特性 Features

? Valley Switching Operation with Valley-Lockout
? Improved efficiency with noise immunity
? Loss-free Adjustable Over Power Protection
? Limits the peak current according to input line voltage
? Auto-recovery or Latched Short-Circuit Protection with adjustable timer
? Versatile short circuit protection for improved reliability
? Dedicated Overtemperature Protection Input
? Allows direct connection to NTC for accurate OTP
? Brown Out Protection
? Protects against drops in input mains voltage
? High voltage startup current source
? Provides a quick and lossless power-on sequence

應用 Application

? High Power Ac-Dc converters
? Notebook Adapters
? Flat TV SMPS

簡介

NCP1336屬于集成電路（IC）的ACDC轉換器離線開關。由制造生產的NCP1336AC DC 轉換器，離線開關該系列是元器件級控制產品，用于構建將交流市電轉換為直流電（通常電壓大幅降低）的設備。集成和未集成系統(tǒng)主要開關元件的器件均包括在內。由于高輸入輸出電壓比，以及此類系統(tǒng)中通常需要隔離，這些器件通常與外部變壓器配合使用。盡管通常使用定制變壓器來實現(xiàn)此用途，但也有許多專門用于此用途的庫存產品，請參見“開關轉換器，SMPS 變壓器”標題。