Constant Voltage / Constant Current Secondary-Side Controller
Description
The NCS1002 is a highly integrated solution for Switching Mode Power Supply (SNIPS) 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 divider that 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 adequately 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
• Low Input Offset Voltage: 0.5 mV, Тур
• Input Common-Mode Range includes Ground
• Low Quiescent Current: 300 uA per Op Amp at Vcc = 5 V
• Large Output Voltage Swing
• Wide Power Supply Range: 3 V to 32 V
• High ESD Protection: 2 kV
• These are Pb-Free Devices

Typical Applications
• Battery Chargers
• Switch Mode Power Supplies