NCP1256ASN100T1G

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1. Describe

The NCP1256ASN100T1G includes everything to build cost−effective switch mode power supplies ranging from a few watts up to several tens of watts. Housed in a tiny TSOP−6 package, the part can be supplied up to 30 V. It hosts a jittered 65 or 100−kHz switching circuitry operated in peak current mode control. When the power in the secondary side starts decreasing, 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 freezing the peak current. NCP1256ASN100T1G comes with several protection features such as a timer−based auto−recovery short circuit protection, lossless OPP, and an easily adjustable Brown Out (BO) pin. Two inputs are provided to latch off the part in a practical way, for instance with OVP and OTP events. Several options exists to chose latch or auto−recovery for these events.

2. Features

    1. Fixed−frequency 65−kHz or 100−kHz Current−mode Control Operation

    2. Adjustable Over Power Protection (OPP) Circuit, Disabled at Low Line

    3. Adjustable Brown Out Level

    4. Frequency Foldback down to 26 kHz and Skip−cycle in Light Load Conditions

    5. Internally−fixed Slope Compensation Ramp

    6. Internally−fixed 4−ms Soft−start

    7. 70−ms Timer−based Auto−recovery Short−circuit Protection

    8. Frequency Jittering in Normal and Frequency Foldback Modes

    9. Double Hiccup Auto−recovery Short−circuit Protection

  10. Pre−short Ready for Latched OCP Option

  11. Latched/Auto−Recovery OVP Protection on Vcc

  12. Latched Inputs for Improved Robustness 

  13. Auto−Recovery ac Line OVP Protection 

  14. +500 mA/ −500 mA Source/Sink Drive Capability

  15. EPS 2.0 Compliant

  16. These are Pb−Free Devices

3. Applications

    1. Ac−dc Adapters for Portable Devices, Computers, Tablets etc.

    2. Auxiliary Power Supplies