The NCP1250 is a highly integrated PWM controller capable of

delivering a rugged and high performance offline power supply in a

tiny TSOP?6 or PDIP?8 package. With a supply range up to 28 V, the

controller hosts a jittered 65 kHz or 100 kHz switching circuitry

operated in peak current mode control. When the power on the

secondary side starts to decrease, the controller automatically folds

back its switching frequency down to a minimum level of 26 kHz. As

the power further goes down, the part enters skip cycle while limiting

the peak current.

Over Power Protection (OPP) is a difficult exercise especially when

no?load standby requirements drive the converter specifications. The

ON proprietary integrated OPP lets you harness the maximum

delivered power without affecting your standby performance simply

via two external resistors. An Over Voltage Protection input is also

combined on the same pin and protects the whole circuitry in case of

optocoupler failure or adverse open loop operation.

Finally, a timer?based short?circuit protection offers the best

protection scheme, letting you precisely select the protection trip point

irrespective of a loose coupling between the auxiliary and the power windings.

Features

? Fixed?Frequency 65 or 100 kHz Current?Mode Control Operation

? Internal and Adjustable Over Power Protection (OPP) Circuit

? Frequency Foldback Down to 26 kHz and Skip?Cycle in Light Load

Conditions

? Internal Ramp Compensation

? Internal Fixed 4 ms Soft?Start

? 100 ms Timer?Based Auto?Recovery Short?Circuit Protection

? Frequency Jittering in Normal and Frequency Foldback Modes

? Option for Auto?Recovery or Latched Short?Circuit Protection

? OVP Input for Improved Robustness

? Up to 28 V VCC Operation

? +300 mA/?500 mA Source/Sink Drive Capability

? Less than 100 mW Standby Power at High Line

? EPS 2.0 Compliant

? These are Pb?Free Devices

Typical Applications

? ac?dc Converters for TVs, Set?top Boxes and Printers

? Offline Adapters for Notebooks and Netbooks

NCP1250ASN65T1G屬于集成電路（IC） > AC DC 轉(zhuǎn)換器，離線開關(guān)。安森美半導(dǎo)體公司制造生產(chǎn)的NCP1250ASN65T1GAC DC 轉(zhuǎn)換器，離線開關(guān)該系列是元器件級控制產(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實現(xiàn)此用途，但也有許多專門用于此用途的庫存產(chǎn)品，請參見“開關(guān)轉(zhuǎn)換器，SMPS 變壓器”標(biāo)題。