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NCP1653ADR2G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP1653ADR2G Datasheet(HTML) 9 Page - ON Semiconductor |
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9 / 19 page  NCP1653, NCP1653A http://onsemi.com 9 FUNCTIONAL DESCRIPTION Introduction The NCP1653 is a Power Factor Correction (PFC) boost controller designed to operate in fixed−frequency Continuous Conduction Mode (CCM). It can operate in either peak current−mode or average current−mode. Fixed−frequency operation eases the compliance with EMI standards and the limitation of the possible radiated noise that may pollute surrounding systems. The CCM operation reduces the application di/dt and the resulting interference. The NCP1653 is designed in a compact 8−pin package which offers the minimum number of external components. It simplifies the design and reduces the cost. The output stage of the NCP1653 incorporates ±1.5 A current capability for direct driving of the MOSFET in high−power applications. The NCP1653 is implemented in constant output voltage or follower boost modes. The follower boost mode permits one to significantly reduce the size of the PFC circuit inductor and power MOSFET. With this technique, the output voltage is not set at a constant level but depends on the RMS input voltage or load demand. It allows lower output voltage and hence the inductor and power MOSFET size or cost are reduced. Hence, NCP1653 is an ideal candidate in high−power applications where cost−effectiveness, reliability and high power factor are the key parameters. The NCP1653 incorporates all the necessary features to build a compact and rugged PFC stage. The NCP1653 provides the following protection features: 1. Overvoltage Protection (OVP) is activated and the Drive Output (Pin 7) goes low when the output voltage exceeds 107% of the nominal regulation level which is a user−defined value. The circuit automatically resumes operation when the output voltage becomes lower than the 107%. 2. Undervoltage Protection (UVP) is activated and the device is shut down when the output voltage goes below 8% of the nominal regulation level. The circuit automatically starts operation when the output voltage goes above 12% of the nominal regulation level. This feature also provides output open−loop protection, and an external shutdown feature. 3. Overpower Limitation (OPL) is activated and the Drive Output (Pin 7) duty ratio is reduced by pulling down an internal signal when a computed input power exceeds a permissible level. OPL is automatically deactivated when this computed input power becomes lower than the permissible level. 4. Overcurrent Protection (OCP) is activated and the Drive Output (Pin 7) goes low when the inductor current exceeds a user−defined value. The operation resumes when the inductor current becomes lower than this value. 5. Thermal Shutdown (TSD) is activated and the Drive Output (Pin 7) is disabled when the junction temperature exceeds 150 _C. The operation resumes when the junction temperature falls down by typical 30 _C. CCM PFC Boost A CCM PFC boost converter is shown in Figure 25. The input voltage is a rectified 50 or 60 Hz sinusoidal signal. The MOSFET is switching at a high frequency (typically 102 kHz in the NCP1653) so that the inductor current IL basically consists of high and low−frequency components. Filter capacitor Cfilter is an essential and very small value capacitor in order to eliminate the high−frequency component of the inductor current IL. This filter capacitor cannot be too bulky because it can pollute the power factor by distorting the rectified sinusoidal input voltage. Figure 25. CCM PFC Boost Converter Vin Iin IL L Vout Cbulk Cfilter PFC Methodology The NCP1653 uses a proprietary PFC methodology particularly designed for CCM operation. The PFC methodology is described in this section. Figure 26. Inductor Current in CCM I in t 2 t 1 time T I L As shown in Figure 26, the inductor current IL in a switching period T includes a charging phase for duration t1 and a discharging phase for duration t2. The voltage conversion ratio is obtained in (eq.1). Vout Vin + t1 ) t2 t2 + T T * t1 Vin + T * t1 T Vout (eq.1) |
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