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NCP1601ADR2G Datasheet(PDF) 9 Page - ON Semiconductor |
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NCP1601ADR2G Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 18 page NCP1601A, NCP1601B http://onsemi.com 9 FUNCTIONAL DESCRIPTION Introduction The NCP1601 is a Power Factor Correction (PFC) boost controller designed to operate in Discontinuous Conduction Mode (DCM) and Critical Conduction Mode (CRM). The fixed−frequency nature of DCM limits the maximum switching frequency. It limits the possible conducted and radiated EMI noise that may pollute surrounding systems. NCP1601 offers the simplest solution to PFC including fewer external circuit components and simple voltage−mode feedback. The diode turn−off switching loss is negligible and hence there is no need to use a low reverse−recovery time trr diode. On the other hand, the CRM feature is added to limit the maximum current stress to twice of the average current. The NCP1601 incorporates high safety protection features and combines the advantages of DCM and CRM so that the NCP1601 is suitable for robust and compact PFC stages. The NCP1601 provides the following protection features: 1. Overvoltage Protection (OVP) is activated and the output drive 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 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 resumes operation when the output voltage goes above 8% of the nominal regulation level. This feature also provides output open−loop protection and external shutdown feature. 3. Overcurrent Protection (OCP) is activated and the output device goes low when the inductor current exceeds a user−defined value. The operation automatically resumes when the inductor current becomes lower than this user−defined value at the next clock cycle. 4. Thermal Shutdown (TSD) is activated and the output drive is disabled when the junction temperature exceeds 140 °C. The operation resumes when the junction temperature falls down by typical 45 °C. The NCP1601 is available in two versions. The NCP1601A has a typical 4.75 V undervoltage lockout (UVLO) hysteresis, while NCP1601B has a typical 1.5 V UVLO hysteresis. It allows the use of different VCC biasing schemes. Operating Modes of NCP1601 The NCP1601 is a PFC driver primarily designed to operate in fixed−frequency DCM. In the most stressful conditions, CRM can be an alternative option which is without power factor degradation. On the other hand, the NCP1601 can be viewed as a CRM controller with a frequency clamp (maximum switching frequency limit) alternative option which is also without power factor degradation. In summary, the NCP1601 can cover both CRM and DCM without power factor degradation. Based on the selections of the boost inductor and the oscillator frequency, the circuit is capable of the following three applications. 1. “Mostly in CRM” with a frequency clamp set by the oscillator or synchronization frequency. 2. “Mostly in fixed−frequency mode DCM” and only run in CRM at high load and low line. 3. “Fixed−frequency DCM” only. Figure 25. Operating Modes Inductor current, IL Input current, Iin time Current DCM DCM Critical Mode DCM needs higher peak inductor current comparing to CRM in the same averaged input current. Hence, CRM is generally preferred at around the sinusoidal peak for lower the maximum current stress but DCM is also preferred at the non−peak region to avoid excessive switching frequencies. Because of the variable−frequency feature of the CRM and constant−frequency feature of DCM, switching frequency is the maximum in the DCM region and hence the minimum switching frequency will be found at the moment of the sinusoidal peak. DCM PFC Circuit A DCM/CRM PFC boost converter is shown in Figure 26. Input voltage is a rectified 50 or 60 Hz sinusoidal signal. The MOSFET is switching at a high frequency (typically around 100 kHz) so that the inductor current IL basically consists of high−frequency and low−frequency components. Filter capacitor Cfilter is an essential and very small value capacitor in order to eliminate the high−frequency content of the DCM inductor current IL. This filter capacitor cannot |
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