●The NCP1256 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 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. NCP1256 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.
●Features | | Benefits
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● Frequency Foldback down to 26 kHz and Skip−cycle in Light Load Conditions
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● More efficient light load operation
● 70−ms Timer−based Auto−recovery Short−circuit Protection
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● Short circuit operation for safety yet reliable with auto-recovery for flexible restart
● Frequency Jittering in Normal and Frequency Foldback Modes
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● Jitter reduces EMI by spreading the switching sprectrum over a wider band
● +500 mA/ −500 mA Source/Sink Drive Capability
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● Ability to drive larger FETs
● Pb−Free Device
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● Environment friendly
● Fixed−frequency 65−kHz or 100−kHz Current−mode Control Operation
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● Adjustable Over Power Protection (OPP) Circuit, Disabled at Low Line
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● Adjustable Brown Out Level
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● Internally−fixed Slope Compensation Ramp
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● Internally−fixed 4−ms Soft−start
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● Double Hiccup Auto−recovery Short−circuit Protection
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● Pre−short Ready for Latched OCP Option
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● Latched OVP Protection on Vcc
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● Latched Inputs for Improved Robustness (OVP and OTP implementations)
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● EPS 2.0 Compliant
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