Product Overview NCS1002: Secondary-Side Controller, Constant Current, Constant Voltage For complete documentation, see the data sheet Product Description The NCS1002 Constant Voltage and Constant Current Secondary Controller is a highly integrated solution for Switching Mode Power Supply (SMPS) applications requiring a dual control loop to perform Constant Voltage (CV) and Constant Current (CC) regulation. The NCS1002 integrates a 2.5 V voltage reference and two precision op amps. The voltage reference, along with Op Amp 1, is the core of the voltage control loop. Op Amp 2 is an independent, uncommitted amplifier specifically designed for the current control.Key external components needed to complete the two control loops are: (a)A resistor dividerthat senses the output of the power supply (battery charger) and fixes the voltage regulation set point at the specified value. (b) A sense resistor that feeds the current sensing circuit with a voltage proportional to the DC output current. This resistor determines the current regulation set point and must be adquately rated in terms of power dissipation. The NCS1002 comes in a small 8-pin SOIC package and is ideal for space-shrunk applications such as battery chargers. Features • • • • Benefits Low Input Offset Voltage: 0.5mV, Typ Input Common-Mode Range includes Ground. Low Quiescent Current: 300uA per op amp at Vcc=5V. Wide Power Supply Range: 3V to 32V • • • • Applications Improved control Greater design range Lower heat dissipation Greater flexibility End Products • Voltage regulation • LED Lighting • Switch Mode Power Supplies Part Electrical Specifications Product Compliance Status NCS1002DR2G Pb-free Active Type V(BR) Typ (V) Tolerance (%) IQ Typ (mA) 0.4 0.4 IR Min (mA) Halide free For more information please contact your local sales support at www.onsemi.com Created on: 6/30/2016 VF Max (V) TA Min (°C) TA Max (°C) Package Type -40 105 SOIC-8