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NCP1216AP133G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP1216AP133G Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 18 page  NCP1216, NCP1216A www.onsemi.com 9 APPLICATION INFORMATION Introduction The NCP1216 implements a standard current mode architecture where the switch−off event is dictated by the peak current setpoint. This component represents the ideal candidate where low part count is the key parameter, particularly in low−cost AC−DC adapters, TV power supplies etc. Due to its high−performance High−Voltage technology, the NCP1216 incorporates all the necessary components normally needed in UC384X based supplies: timing components, feedback devices, low−pass filter and self−supply. This later point emphasizes the fact that ON Semiconductor’s NCP1216 does NOT need an auxiliary winding to operate: the product is naturally supplied from the high−voltage rail and delivers a VCC to the IC. This system is called the Dynamic Self−Supply (DSS): Dynamic Self−Supply (DSS): Due to its Very High Voltage Integrated Circuit (VHVIC) technology, ON Semiconductor’s NCP1216 allows for a direct pin connection to the high−voltage DC rail. A dynamic current source charges up a capacitor and thus provides a fully independent VCC level to the NCP1216. As a result, there is no need for an auxiliary winding whose management is always a problem in variable output voltage designs (e.g. battery chargers). Adjustable Skip Cycle Level: By offering the ability to tailor the level at which the skip cycle takes place, the designer can make sure that the skip operation only occurs at low peak current. This point guarantees a noise−free operation with cheap transformers. Skip cycle offers a proven mean to reduce the standby power in no or light loads situations. Internal Frequency Dithering for Improved EMI Signature: By modulating the internal switching frequency with the DSS VCC ripple, natural energy spread appears and softens the controller’s EMI signature. Wide Switching − Frequency Offered with Different Options (65 kHz − 100 kHz − 133 kHz): Depending on the application, the designer can pick up the right device to help reducing magnetics or improve the EMI signature before reaching the 150 kHz starting point. Ramp Compensation: By inserting a resistor between the Current Sense (CS) pin and the actual sense resistor, it becomes possible to inject a given amount of ramp compensation since the internal sawtooth clock is routed to the CS pin. Sub−harmonic oscillations in Continuous Conduction Mode (CCM) can thus be compensated via a single resistor. Over Current Protection (OCP): By continuously monitoring the FB line activity, NCP1216 enters burst mode as soon as the power supply undergoes an overload. The device enters a safe low power operation, which prevents from any lethal thermal runaway. As soon as the default disappears, the power supply resumes operation. Unlike other controllers, overload detection is performed independently of any auxiliary winding level. In presence of a bad coupling between both power and auxiliary windings, the short circuit detection can be severely affected. The DSS naturally shields you against these troubles. Wide Duty−Cycle Operation: Wide mains operation requires a large duty−cycle excursion. The NCP1216 can go up to 75% typically. For Continuous Conduction Mode (CCM) applications, the internal ramp compensation lets you fight against sub−harmonic oscillations. Low Standby Power: If SMPS naturally exhibit a good efficiency at nominal load, they begin to be less efficient when the output power demand diminishes. By skipping unnecessary switching cycles, the NCP1216 drastically reduces the power wasted during light load conditions. In no−load conditions, the NPC1216 allows the total standby power to easily reach next International Energy Agency (IEA) recommendations. No Acoustic Noise While Operating: Instead of skipping cycles at high peak currents, the NCP1216 waits until the peak current demand falls below a user−adjustable 1/3 of the maximum limit. As a result, cycle skipping can take place without having a singing transformer, one can thus select cheap magnetic components free of noise problems. External MOSFET Connection: By leaving the external MOSFET external to the IC, you can select avalanche proof devices, which in certain cases (e.g. low output powers), let you work without an active clamping network. Also, by controlling the MOSFET gate signal flow; you have an option to slow down the device commutation, therefore reducing the amount of ElectroMagnetic Interference (EMI). SPICE Model: A dedicated model to run transient cycle−by−cycle simulations is available but also an averaged version to help you closing the loop. Ready−to−use templates can be downloaded in OrCAD’s PSpice and INTUSOFT’s IsSpice from ON Semiconductor web site, in the NCP1216 related section. |
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