Description
The NCS1002 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 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.