NCP1336A_V01中文資料安森美半導(dǎo)體數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

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