NCV3843BVD1R2G

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NCV3843BVD1R2G is a synchronous buck-boost 3-port controller which is specially designed to provide a current-mode control based solution for non-isolated dc-dc buck-boost converter applications. It integrates two complete integrated buck-boost regulators and two bias supply regulator circuits to supply all the necessary operating voltages. This controller required only a single inductor to complete the entire design. The control scheme ensures controllable transition between buck and boost modes and realized excellent dynamic performance.

Applications of NCV3843BVD1R2G include automotive applications such as powertrain, climate control, ECU, telematics, body, and safety systems; consumer applications such as white goods, NAS and media server; industrial applications such as industrial automation, factory instrumentation, lighting and motor control systems; and portable applications such as industrial portable products, medical and dental equipment, environmental monitoring systems and power tools.

Working Principle of NCV3843BVD1R2G

The operating principle of NCV3843BVD1R2G is governed by a patented current-mode control topology. It controls two buck-boost regulators which run on isolated power sources. This is done by maintaining the fixed relationship between input side and output side. The input side waveforms are connected to the output side but they maintain low-interaction between them. The controller regulates the output voltage by regulating the input voltage, and the current sensing circuit of the current-mode controller monitors the output current by controlling the voltage signals.

NCV3843BVD1R2G features a proprietary Active Spread spectrum Control (ASSC) which helps in providing a very low EMI/RFI radiation profile and also a very wide range for input voltages. The wide range is important because most applications need to supply power from a variety of different sources like battery and ac power. Once the power is switched on, the proprietary Automatic Power Path Selection (APPS) algorithm will optimize the efficiency and performance of the system by automatically selecting the best power source.

NCV3843BVD1R2G is equipped with an active voltage positioner (AVP) which ensures a precise and fast control of the output voltage level. The AVP reduces the transient output voltage overshoot and undershoot significantly, ensuring system stability and meeting the SoC requirements. The AVP works by modulating the voltage of the input source in such a way that it causes a shift in the output voltage level. This modulation is done in such a way that it does not cause any cross-regulation issue.

NCV3843BVD1R2G also features an enable/disable function which can be used to enable/ disable one of the two channels for more efficient operation and power savings. When enabled, NCV3843BVD1R2G uses the second channel to act as a synchronous rectifier to deliver maximum power transfer efficiency. When disabled, NCV3843BVD1R2G will operate as a single channel controller and use the second channel as an open rectifier.

NCV3843BVD1R2G also provides thermal overload protection and short circuit protection. The short circuit protection works by sensing the current flowing through the inductor and if that current exceeds the predetermined value, the NCV3843BVD1R2G will shut down the controller to safeguard the system from any damage. The thermal overload protection works by sensing the temperature of the inductor and if it exceeds a predetermined temperature, the controller will shut down the controller to protect the system from any damage.

To summarize, NCV3843BVD1R2G is an advanced 3-port controller which offers an efficient and reliable solution for non-isolated buck-boost applications with its patented current-mode control topology. It comes with different protection mechanisms such as over-temperature protection, short circuit protection and active voltage positioner. It also offers maximum power conversion efficiency and improved dynamic performance thanks to the Automatic Power Path Selection and Active Spread Spectrum Control algorithms.

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