NCP1075STBT3G

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NCP1075STBT3G is a member of the ON Semiconductor AC/DC Converters, Offline Switchers family of devices. It is a 3A ideal diode, primary-side regulatable synchronous rectifier controller PWM integrated circuit (IC) with an operating temperature range of -40C to +125C. This device is optimized for an off-line, non-isolated, bridge topology power supply with a full bridge rectifier. It is designed to work with one controller on the secondary side, so that the AC/DC converter can achieve up to 95% efficiency. It is suitable for a broad range of applications including industrial, telecommunications, computing, and portable equipment.

The NCP1075STBT3G is based on ON Semiconductor’s proprietary synchronous rectifier controller technology that enables high efficiency by minimizing the switching losses of synchronous rectifiers and integrated power switches. The chip is designed to provide a regulated voltage between its output terminals, while also maintaining low output ripple and noise. The device is highly integrated, consisting of a gate driver, controller logic and feedback comparator, as well as other features, including a sync/frequency control input, an enable/disable control input, and a dual-direction current sense and reporting.

The NCP1075STBT3G operates by using a logic circuit to drive a gate driver. The logic circuit monitors the output voltage and current, and adjusts the current-sensing reference and error amplifier to control the output voltage. When the supply voltage is greater than the regulated voltage, the synchronous rectifier is enabled, allowing current to flow from the dc bus to the output. When the supply voltage is less than the regulated voltage, the control logic commands the gate driver to turn off the synchronous rectifier, eliminating current flow from the secondary side. In this way, the output voltage is regulated, and the device maintains a 99% efficiency and low ripple and noise.

The NCP1075STBT3G design also includes an asynchronous turn-off feature that greatly improves the light-load efficiency of the system. When the device senses a light load, it turns off the secondary synchronous rectifier and allows the output voltage to float. This also reduces the total system power consumption, providing better efficient operation and increased standby power savings. The NCP1075STBT3G can also sense and report high and low side current flow, helping to protect against overloads and faults.

The NCP1075STBT3G is an ideal solution for high-efficiency, buck- and boost-mode, full bridge rectifier applications. This device is well-suited for industrial, telecommunications, computing, and portable equipment applications, as well as any application that requires high-efficiency and low standby power consumption. This highly integrated and easy-to-implement IC makes it easy to achieve efficient, reliable, and cost-effective power designs without sacrificing performance.

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