The TPS5206CN is a bipolar monolithic integrated circuit designed for push-pull-type switching-power-supply (SPS) control in desktop PC applications. It offers pulse-width-modulation (PWM) control and power-supply supervisor functions, including detection of undervoltage and overvoltage conditions on 5 V and 12 V system supplies. It also detects overcurrent conditions on the SPS system output. This single chip reduces the total component count and provides additional design flexibility, which minimizes cost and printed-circuit-board (PCB) space requirements in present and new SPS designs. overvoltage-protection lockout feature The overvoltage-protection lockout feature monitors four different supply voltages. When an overvoltage (OV) condition is detected, the power-good output (PGO) is set low and the PWM function is disabled. The OV condition is detected on the SVP5, SVP12, SVN5, and SVN12 inputs. Threshold voltages are typically 5.9 V, 14.1 V, 8.4 V, and 15.3 V, respectively. undervoltage-protection lockout feature The undervoltage-protection lockout feature monitors four different supply voltages. When an undervoltage (UV) condition is detected, the power-good output (PGO) is set low and the PWM function is disabled. The UV condition is detected on the SVP5, SVP12, SVN5, and SVN12 inputs. Threshold voltages are typically 3.9 V, 9.5 V, 3.4 V, and 9.3 V, respectively. overcurrent-protection lockout feature The overcurrent (OC) protection lockout feature is designed to protect the SPS from excessive load or short-circuit conditions. The circuit converts the output current of the SPS to a voltage, which is then monitored at SC. It sets PG low and shuts down the PWM circuit when the sensed voltage is higher than 5 V. reference regulator