VN1160-E

VN1160-E is a AC/DC universal off-line switch-mode power supply (SMPS) control IC. It is designed for use in off-line SMPS with limited standby and operating power. The VN1160-E is a fully programmable circuit for controlling the primary side of an off-line SMPS. It integrates a variable duty cycle with an active power factor correction (PFC) controller and over-voltage protection (OVP). Its internal soft start circuitry eliminates the need for external components.The VN1160-E can operate in CCM, DCM, and QR modes, making it versatile and suitable for a wide range of applications requiring low standby power and high efficiency. The device includes a programmable slope compensation and sampling algorithm that reduces line current fluctuations and minimizes EMI. To minimize wake-up time, the VN1160-E includes auto-restart and brown-in functions, which reduces the time to switch from a low-power to a normal power state. The VN1160-E is available in a low profile 10-pin SOIC package, its configuration and features make it suitable for a variety of SMPS applications. ApplicationsThe VN1160-E is designed for off-line AC/DC adapter applications, such as powering set top boxes, routers, audio systems, DVD players and Blu-ray players. It can also be used for USB power charging, notebook power adapters and other offline applications. Working PrincipleThe VN1160-E is a low power off-line switch-mode power supply controller with active power factor corrections and over-voltage protections designed for use in mains-fed or manually powered AC/DC adapter applications. The internal self-oscillating feature of the VN1160-E reduces the need of external components to control the primary side of an off-line SMPS. The VN1160-E includes a variable duty cycle, a programmable slope compensation and sampling algorithm, an auto restart function and an over-voltage protection (OVP). It also includes a Brown-In function that reduces the activation time by allowing an immediate start-up after an input voltage disconnect.The input of the SMPS can be directly connected to the AC mains. The VN1160-E samples the line voltage periodically and adjusts the duty cycle accordingly to keep the line current below the user programmed maximum value. The average line current is regulated by the sensing resistor on the source side of the PFC MOSFET. The VN1160-E also includes a programmable, active power factor correction (PFC) circuit that enables it to sharply reduce the current peaks to the mains grid and thus reduce or eliminate input power harmonic distortions. The programmable over-voltage protection (OVP) function is available for the AC input, DC output and internal power stages. To increase the system efficiency, the VN1160-E includes an internal soft start circuit that eliminates the need for external timing components. It also includes a power saving mode that extends the stand-by time. SummaryThe VN1160-E is a low-power, off-line switch-mode power supply (SMPS) controller with active power factor correction (PFC) and over-voltage protection (OVP), specifically designed for AC/DC applications. It includes a programmable duty cycle, a programmable slope compensation and sampling algorithm, an auto-restart function and a Brown-in function, which reduces the activation time. Its internal self-oscillation eliminates the need for external components, increasing the efficiency of the SMPS system.