NCP1631 ON Semiconductor, NCP1631 Datasheet
NCP1631
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NCP1631 Summary of contents
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... Also, Interleaving extends the power range of Critical Conduction Mode that is an efficient and cost−effective technique (no need for low t diodes). In addition, the NCP1631 drivers are 180° phase shift rr for a significantly reduced current ripple. Housed in a SOIC16 package, the circuit incorporates all the features necessary for building robust and compact interleaved PFC stages, with a minimum of external components ...
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R bo1 Ac lin e R bo2 EMI Filter Cin Table 1. MAXIMUM RATINGS TABLE Symbol V Maximum Power Supply Voltage Continuous CC(MAX) V Maximum Input Voltage on Low Power Pins MAX V V Pin Maximum Input Voltage Control(MAX) ...
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Table 2. TYPICAL ELECTRICAL CHARACTERISTICS TABLE www.DataSheet4U.com (Conditions pin7 Characteristics STARTUP AND SUPPLY CIRCUITS Supply Voltage Startup Threshold Minimum Operating Voltage Hysteresis V – V CC(on) CC(off) Internal Logic Reset ...
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Table 2. TYPICAL ELECTRICAL CHARACTERISTICS TABLE www.DataSheet4U.com (Conditions pin7 Characteristics GATE DRIVE Fall Time DRV1 DRV2 REGULATION BLOCK Feedback Voltage Reference Error Amplifier Source Current Capability Error Amplifier Sink Current ...
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Table 2. TYPICAL ELECTRICAL CHARACTERISTICS TABLE www.DataSheet4U.com (Conditions pin7 Characteristics ZERO VOLTAGE DETECTION CIRCUIT (valid for ZCD1 and ZCD2) Internal Input Capacitance (Note 5) ZCD Watchdog Delay BROWN−OUT DETECTION Brown−Out ...
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Table 3. DETAILED PIN DESCRIPTION www.DataSheet4U.com Pin Number Name 1 ZCD2 OSC 5 V Control 6 Freq. Foldback 7 BO (Brown−out Protection) 8 OVP / UVP Latch 11 DRV2 12 V ...
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Vout low detect − 0.955*Vref + Error Amplifier FB − Vref + OVLflag1 Vcontrol OF F pfcOK Generation of the oscillator charge current I FF FFOLD function of V REGUL (frequency fold−back) I < Generation of ...
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... Brown−Out Detection: the circuit stops operating if Thermal Shutdown: the circuit stops pulsing when NCP1631 Operating Modes The NCP1631 drives the two branches of the interleaved in FCCrM where each phase operates in Critical conduction Mode (CrM) in the most stressful conditions and in Discontinuous Conduction Mode (DCM) otherwise, acting as a CrM controller with a frequency clamp (given by the oscillator) ...
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... NCP1631 does to perform FCCrM operation that is, to operate in discontinuous or critical conduction mode according to the conditions, without degradation of the power factor. Figure 4. Boost Converter Figure 5. Inductor Current in DCM The NCP1631 operates in voltage mode. As portrayed by Figure 6, the MOSFET on time t V ton Where: • ...
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... That is why the NCP1631 automatically TON REGUL adapts to the conditions and jumps from DCM and CrM (and vice versa) without power factor degradation and without discontinuity in the power delivery. The charging current I is internally processed proportional to the square of the line magnitude ...
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... The swing of the error amplifier output is limited within It is forced above a voltage drop (V F clamp” circuitry. When this circuitry is activated, the power demand is minimum and the NCP1631 enters skip mode (the controller stops pulsating) until the clamp is no more active clamped not to exceed 3 the same V voltage drop ...
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... In that way, the ZCD voltage (“V inductor current drops to zero. The NCP1631 detects this falling edge and allows the next driver on time. of the ZCD winding exceeds 0.5 V. When this is the case, the coil is in demagnetization phase and the latch L set ...
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... Current Sense The NCP1631 is designed to monitor a negative voltage proportional to total input current, i.e., the current drawn by the two interleaved branches (I Figure 13, a current sense resistor (R inserted within the return path to generate a negative voltage (V ) proportional detect when I exceeds its maximum permissible level. To ...
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... http://onsemi.com 14 The propagation delay (I < in−rush However when the circuit starts to operate, the NCP1631 V aux2 V aux1 DRV 2 (from ZCD M block) 1 In−rush Q ZCD1 DRV 1 Q ZCD2 DRV 1 DRV 2 1. One for regulation applied to pin 2. ...
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... TON compensate it (refer to Figure 7). PfcOK / REF5V Signal The NCP1631 can communicate with the downstream converter. The signal “pfcOK/REF5V” is high (5 V) when the PFC stage is in normal operation (its output voltage is stabilized at the nominal level) and low otherwise. ...
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However, the coil current can possibly be non www.DataSheet4U.com zero when the clock signal turns high. The circuit would enter Continuous Conduction Mode (CCM) if the MOSFET turned on in that moment. In order to avoid CCM operation, the ...
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... I linearly vary as a function of V OSC(DISCH) the regulation block that thanks to the feed−forward featured by the NCP1631, is representative of the load. The practical implementation is portrayed by Figure 16. The oscillator charge current is then an increasing function of V The oscillator discharge current is: The oscillator discharge current is also an increasing function of V and is clamped to105 mA ...
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OSC f OSC Let’s illustrate this operation on an example the control signal that varies between 0 and REGUL 1. 1.66 V) corresponding to the maximum REGUL power (P ) that can virtually ...
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... As a result, the NCP1631 effectively “blanks” any mains interruption that is shorter than 25 ms (minimum guaranteed value of the 50−ms timer). ...
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... The temperature shutdown keeps active as long as the CC RESET. The reset action forces the TSD threshold to The NCP1631 incorporates an Under−Voltage Lockout goes below the UVLO CC The circuit off state consumption is very low: < 50 mA. This low consumption enables to use resistors to charge capacitor during the start− ...
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When any of the following faults is detected: − brown−out (“BO_NOK”) − Under−Voltage Protection (“UVP”) − Latch−off condition (“Stdwn”) − Die over−temperature (“TSD”) − Too low current sourced by the R − “UVLO” (improper Vcc level for operation) The ...
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Figure 21. Start−up and Brown Out Conditions http://onsemi.com 22 ...
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... D 0.35 0.49 0.014 0.019 F F 0.40 1.25 0.016 0.049 G 1.27 BSC 0.050 BSC J 0.19 0.25 0.008 0.009 K 0.10 0.25 0.004 0.009 5.80 6.20 0.229 0.244 J R 0.25 0.50 0.010 0.019 1.27 PITCH ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your loca Sales Representative NCP1631 ...