NCP1071STBT3G

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The NCP1071STBT3G is a state of the art integrated AC-DC converter and offline switcher for PMIC or power management integrated circuits. It consists of a high-efficiency synchronous rectifier plus a ripple-controlled avalanche-proof high-side MOSFET, with an integral gate driver, a simple N-channel topology and a low external component count. The integrated synchronous rectifier not only eliminates power losses, but also prevents the need for external diodes. The integrated gate driver eliminates the need for additional gate drive components, and the simple N-channel topology eliminates the need for complicated output rectifier components.

The device is designed to address industrial PMIC applications requiring reliable and efficient power conversion with minimal external components. It is also capable of providing inrush current protection and of accepting a wide input voltage range for applications requiring voltage conversions from 9V-68V. It has an output range of 10W continuous with capability up to 15W for short interval periods. Its databook specifications include a turn-on delay of 0.2 ms, a minimum on-time of 3ms, and a maximum on-time of 15ms. The power conversion is accomplished by a high switching frequency (250 kHz) with a very low start-up current suitable for single rail applications.

The key to this device is the integrated synchronous rectifier, which makes it possible to eliminate the need for cumbersome external rectifier components. This reduces design space, cost and complexity. By integrating a MOSFET drive, the device also eliminates the need for external gate driver components and allows the board area to be more efficiently used.

The main features that make the NCP1071STBT3G stand out are its wide input voltage range (up to 68V), its efficiency level up to 95%, its low switching frequency (250 kHz) and its low start-up current. The device also provides integrated inrush current protection, which can be tailored to suit specific demands of application-specific power supplies. This is critical for preventing power supply collapses during power up and short-circuiting.

The working principle of the NCP1071STBT3G is fairly simple. The input voltage is rectified by the synchronous rectifier and filtered to provide an input voltage for the power conversion process. Depending on the application-specific needs, the synchronous rectifier can be set to either cut-off or clipping mode. When the converter is chosen in clipping mode, the rectified current is limited by a feedback loop in the integrated gate driver. The IC also contains a comparator and timer, which are used to monitor the input voltage and to limit the on-time of the device during overload conditions. The current through the output MOSFET is thus accurately regulated with the device turn-on and turn-off times, resulting in a constantly regulated output voltage.

To sum up, the NCP1071STBT3G is a state of the art integrated AC-DC converter and offline switcher, designed to address industrial PMIC applications requiring reliable and efficient power conversion with minimal external components. It can provide power conversion at a high efficiency level of up to 95%, while maintaining a wide input voltage range up to 68V, a low switching frequency and a low start-up current. The integrated synchronous rectifier, MOSFET drive and inrush current protection make it suitable for single rail applications, while the feedback loop regulates the output voltage to prevent power supply collapses.

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