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NCP1605BDR2G Datasheet(PDF) 6 Page - ON Semiconductor |
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NCP1605BDR2G Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 32 page NCP1605, NCP1605A, NCP1605B http://onsemi.com 6 PIN FUNCTION DESCRIPTION Pin Number Name Function 1 STBY An external signal (typically, a portion of the feedback signal of the downstream converter or a filtered portion of the SMPS drive pulses) should be applied to Pin 1. When the Pin 3 voltage goes below 300 mV, the circuit enters a burst mode operation where the bulk voltage varies between the regulation voltage and 95.5% of this level. 2 Brown−Out / Inhibition Apply a portion of the averaged input voltage to detect brown−out conditions. If VPin2 is lower than 0.5 V, the circuit stops pulsing until VPin2 exceeds 1 V (0.5 V hysteresis). Ground Pin 6 to disable the part. 3 VCONTROL / Soft−Start The error amplifier output is available on this Pin. The capacitor connected between this pin and ground adjusts the regulation loop bandwidth that is typically set below 20 Hz to achieve high Power Factor ratios. Pin 3 is grounded when the circuit is off so that when it starts operation, the power increases slowly (soft−start). 4 Feedback This pin receives a portion of the pre−converter output voltage. This information is used for the regulation and the “output low” detection (VOUTL) that drastically speed up the loop response when the output voltage drops below 95.5% of the wished level. 5 Current Sense Input This pin monitors a negative voltage proportional to the coil current. This signal is sensed to limit the maximum coil current and detect the core reset (coil demagnetization). 6 Current Sense Output This pin sources the Pin 5 current. Place a resistor between Pin 6 and ground to build the voltage proportional to the coil current and detect the core reset. The impedance between Pin 6 and ground should not exceed 3 times that of the Pin 5 to ground. You can further apply the voltage from an auxiliary winding to improve the valley detection of the MOSFET drain source voltage. 7 Ct (Ramp) The circuit controls the power switch on−time by comparing the Pin 7 ramp to an internal voltage (“Vton”) derived from the regulation block and the sensed “dcycle” (relative duration of the current cycle over the corresponding switching period). Pin 7 sources a current proportional to the squared output voltage to allow the Follower Boost operation (optional) where the PFC output voltage stabilizes at a level that varies linearly versus the ac line amplitude. This technique reduces the difference between the output and input voltages, to optimize the boost efficiency and minimize the size and cost of the PFC stage 8 Oscillator / synchronization Connect a capacitor or apply a synchronization signal to this pin to set the switching frequency. If the coil current cycle is longer than the selected switching period, the circuit delays the next cycle until the core is reset. Hence, the PFC stage can operate in CRM in the most stressful conditions. 9 GND Connect this pin to the pre−converter ground. 10 Drive The high current capability of the totem pole gate drive (+0.5/−0.8 A) makes it suitable to effectively drive high gate charge power MOSFETs. 11 VCC This pin is the positive supply of the IC. The circuit starts to operate when VCC exceeds 15 V (10.5 V for NCP1605A) and turns off when VCC goes below 9 V (typical values). After startup, the operating range is 10 V up to 20 V. 12 PfcOK / REF5V The Pin 12 voltage is high (5 V) when the PFC stage is in a normal, steady state situation and low otherwise. This signal serves to “inform” the downstream converter that the PFC stage is ready and that hence, it can start operation. 13 STDWN Apply a voltage higher than 2.5 V on Pin 13 to permanently shutdown the circuit. This pin can be used to monitor the voltage across a thermistor in order to protect the application from an excessive heating and/or to detect an overvoltage condition. To resume operation, it is necessary to decrease the circuit VCC below VCCRST (4 V typically) by for instance, unplugging the PFC stage and replugging it after VCC is discharged. 14 OVP / UVP The circuit turns off when VPin14 goes below 300 mV (UVP) and disables the drive as long as the pin voltage exceeds 2.5 V (OVP). 15 NC Creepage distance. 16 HV Connect Pin 16 to the bulk capacitor. The internal startup current source placed between Pin 16 and the VCC terminal, charges the VCC capacitor at startup. |
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