S-8337ACFA-P8T1G

PMIC - Voltage Regulators - DC DC Switching Controllers

The S-8337ACFA-P8T1G is a DC-DC switching controller IC from Seiko Epson Corporation. It is used in applications such as AC Adapter, Notebook PC, LCD Monitor, Printer and LCD TV’s. The S-8337ACFA-P8T1G is a single-chip DC-DC switching controller that includes three primary functions: feedback control, over current protection and dead time control. It is designed to improve system noise (EMI) performance and reduce EMI problems. It can also be used to detect over-current conditions and shut down the system, thereby protecting the system against over-current damage.

The S-8337ACFA-P8T1G is designed to accept an input voltage range between 4.5V to 32V and provides a fixed output voltage range of 1.2V to 7V. The input voltage can be either AC or DC, and the output voltage can be either AC or DC depending on the application. The device is also capable of providing output currents up to 6A and has an output voltage accuracy of ±1.5%. The switching frequency of the S-8337ACFA-P8T1G is selectable up to 2.2MHz and is internally integrated with an under-voltage lockout (UVLO) circuit. The device also features a selectable skip mode which allows the switching frequency to be reduced to reduce EMI power losses. The device is capable of driving both N- and P-channel power MOSFETs.

The working principle of S-8337ACFA-P8T1G is to sense the input voltage and current and to regulate the output voltage in order to control the power conversion efficiency. The device uses two control loops to regulate the output voltage; an Error Amplifier and an Output Driver. The Error Amplifier compares the internal feedback voltage with an external reference voltage and generates an output signal that is used by the Output Driver to regulate the output voltage. The Output Driver controls the output voltage according to the Error Amplifier\'s output signal. When the output voltage reaches its target, the device enters into a skip mode where the switching frequency is reduced to reduce EMI power losses.

The S-8337ACFA-P8T1G also features several protection features such as over-current protection, dual-MOSFET protection, under-voltage lockout, and thermal shutdown. The device also features an adjustable soft start that allows the system to supply a small current before the full rated current is applied. This eliminates large inrush currents and reduces EMI. The device also features an adjustable delayed current limit control which prevents short circuits by limiting the current during start-up.

In summary, the S-8337ACFA-P8T1G is a DC-DC switching controller IC from Seiko Epson Corporation. It is used in applications such as AC Adapter, Notebook PC, LCD Monitor, Printer, and LCD TVs. It is capable of providing output currents up to 6A and has an output voltage accuracy of ±1.5%. The device is also equipped with several protection features including over-current protection, dual-MOSFET protection, under-voltage lockout, and thermal shutdown. Additionally, it also features a selectable skip mode, an adjustable soft start, and an adjustable delayed current limit control.