The NCP1336 hosts a high?performance circuitry aimed to

powering quasi?resonant converters. Capitalizing on a novel

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 to perform an accurate Over Voltage Protection.

Finally, a brownout pin which stops the circuit operation in presence

of a low mains condition is included.

Features

? Quasi?Resonant Peak Current?Mode Control Operation

? Valley Switching Operation with Valley?Lockout for Noise?Immune Operation

? Internal 5 ms Soft?Start

? Loss?Free Adjustable Over Power Protection

? Auto?Recovery or Latched Internal Output Short? Circuit Protection

? Adjustable Timer for Improved Short?Circuit Protection

? Overvoltage and Overtemperature Protection Inputs

? Brownout Input

? ?500 mA/+800 mA Peak Current Source/Sink Capability

? Internal Temperature Shutdown

? Direct Optocoupler Connection

? 3 s Blanking Delay to Ignore Leakage Ringing at Turn?Off

? Extremely Low No?Load and Standby Power

? SO14 Package

? These are Pb?Free Devices

? This Device uses Halogen?Free Molding Compound

Typical Applications

? High Power ac?dc Converters for TVs, Set?Top Boxes etc

? Offline Adapters for Notebooks

NCP1336B屬于集成電路（IC） > AC DC 轉(zhuǎn)換器，離線開(kāi)關(guān)。安森美半導(dǎo)體公司制造生產(chǎn)的NCP1336BAC DC 轉(zhuǎn)換器，離線開(kāi)關(guān)該系列是元器件級(jí)控制產(chǎn)品，用于構(gòu)建將交流市電轉(zhuǎn)換為直流電（通常電壓大幅降低）的設(shè)備。集成和未集成系統(tǒng)主要開(kāi)關(guān)元件的器件均包括在內(nèi)。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(lái)實(shí)現(xiàn)此用途，但也有許多專門(mén)用于此用途的庫(kù)存產(chǎn)品，請(qǐng)參見(jiàn)“開(kāi)關(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。