NCP1651 Single Stage Power Factor Controller The NCP1651 is an active, power factor correction controller that can operate over a wide range of input voltages. It is designed for 50/60 Hz power systems. It is a fixed frequency controller that can operate in continuous or discontinuous conduction modes. www.onsemi.com The NCP1651 provides a low cost, low component count solution for isolated AC DC converters with mid high output voltage MARKING requirements. The NCP1651 eases the task of meeting the DIAGRAM IEC100032 harmonic requirements for converters in the range of 50 W 250 W. SOIC16 NCP1651G The NCP1651 drives a flyback converter topology to operate in 16 D SUFFIX AWLYWW CASE 751B continuous/discontinuous mode and programs the average input 1 current to follow the line voltage in order to provide unity power factor. By using average current mode control CCM algorithm, the A = Assembly Location NCP1651 can help provide excellent power factor while limiting the WL = Wafer Lot Y = Year peak primary current. Also, the fixed frequency operation eases the WW = Work Week input filter design. G = PbFree Package The NCP1651 uses a proprietary multiplier design that allows for much more accurate operation than with conventional analog PIN CONNECTIONS multipliers. OUT 1 STARTUP 16 Features GND 15 NC 2 Fixed Frequency Operation C NC 3 14 T Average Current Mode PWM RAMP COMP 13 V 4 CC Internal High Voltage Startup Circuit I 5 12 V S+ ref Continuous or Discontinuous Mode Operation I 6 11 AC COMP avg fltr High Accuracy Multiplier I AC REF 7 10 avg Overtemperature Shutdown FB/SD AC INPUT 8 9 External Shutdown (Top View) Undervoltage Lockout Low Cost/Parts Count Solution ORDERING INFORMATION Ramp Compensation Does Not Affect Oscillator Accuracy Device Package Shipping This is a PbFree Device NCP1651DR2G SOIC16 2500/Tape & Reel Typical Applications (PbFree) High Current Battery Chargers For information on tape and reel specifications, Front Ends for Distributed Power Systems including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. Semiconductor Components Industries, LLC, 2015 1 Publication Order Number: May, 2015 Rev. 10 NCP1651/DNCP1651 PIN FUNCTION DESCRIPTION Pin No. Function Description 1 Output Drive output for power FET or IGBT. Capable of driving small devices, or can be connected to an external driver for larger transistors. 2 Ground Ground reference for the circuit. 3 C Timing capacitor for the internal oscillator. This capacitor adjusts the oscillator frequency. T 4 Ramp This pin biases the ramp compensation circuit, to adjust the amount of compensation that is added to Compensation the current signal for stability purposes. 5 I Positive current sense input. Designed to connect to the positive side of the current shunt. S+ 6 I A capacitor connected to this pin filters the high frequency component from the instantaneous current avg fltr waveform, to create a waveform that resembles the average line current. 7 I An external resistor with a low temperature coefficient is connected from this terminal to ground, to set avg and stabilize the gain of the Current Sense Amplifier output that drives the AC error amplifier. 8 Feedback/ The error signal from the error amplifier circuit is fed via an optocoupler or other isolation circuit, to this Shutdown pin. A shutdown circuit is also connected to this pin which will put the unit into a low power shutdown mode if this voltage is reduced to less than 0.6 volts. 9 AC Input The fullwave rectified sinewave input is connected to this pin. This information is used for the reference comparator and the average current compensation circuit. 10 AC Reference A capacitor is connected to this pin to filter the modulated output of the reference multiplier. 11 AC Provides pole for the AC Reference Amplifier. This amplifier compares the sum of the AC input voltage Compensation and the low frequency component of the input current to the reference signal. The response must be slow enough to filter out most of the high frequency content of the current signal that is injected from the current sense amplifier, but fast enough to cause minimal distortion to the line frequency information. 12 Vref 6.5 volt regulated reference output. 13 V Provides power to the device. This pin is monitored for undervoltage and the unit will not operate if the CC V voltage is not within the UVLO range. Initial power is supplied to this pin via the high voltage startup CC network. 14 No Connection This pin is not available due to spacing considerations of the startup pin. 15 No Connection This pin is not available due to spacing considerations of the startup pin. 16 Startup This pin connects to the rectified input signal and provides current to the internal bias circuitry for the startup period of operation. NOTE: Pins 14 and 15 have not been used for clearance considerations due to the potential voltages present on pin 16. In order to maintain proper spacing between the high voltage and low voltage pins, traces should not be placed on the circuit board between pins 16 and 13. www.onsemi.com 2