SG3845DM

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SG3845DM is a high efficiency, automotive grade, DC-DC synchronous Buck step-down switching controller. It is a fully integrated two-switch buck controller featuring a constant frequency current mode control. A direct enable pin allows for user control of the enable state of the controller and the output voltage setting. This controller is part of a family of high efficiency, automotive grade, DC-DC synchronous Buck step-down, step-up and all-in-one switching controllers.

Applications

The SG3845DM is suitable for a wide range of applications such as automotive body, climate, powertrain and HVAC services. It is designed to operate over a wide input voltage range, typically 8 to 48V and delivers up to an 85% or better efficiency. It is suitable for applications requiring a wide input voltage range and high efficiency. Examples include but are not limited to: automotive lighting, DC-DC converters, voltage converters, battery charging, DC-AC converters, telecommunication equipment, server power supply, automotive body and climate control systems.

Working principle

The SG3845DM is a two-switch Buck controller featuring a constant frequency current mode control. It works by using two transistors, an n-channel switch and a synchronous rectifier. The controller produces a regulated output voltage using a pulse width modulation (PWM) technique. This PWM technique uses a fixed frequency with adjustable duty cycle. The duty cycle determines the output voltage. In constant frequency PWM, the switching frequency is fixed while the duty cycle is adjusted based on the input and output voltage. The SG3845DM controller monitors the output voltage and adjusts the duty cycle accordingly to achieve the output voltage set by the user.

The SG3845DM uses an integrated voltage reference circuit to ensure a stable output voltage with minimal temperature drift. The inductor and output capacitors provide ripple cancellation, enabling the controller to maintain a high efficiency even at light loads. The SG3845DM uses a direct enable pin to control the enable state of the controller and the output voltage setting. This direct control enables more accurate control for specific application scenarios.

Conclusion

The SG3845DM is a high efficiency, automotive grade, DC-DC synchronous Buck step-down switching controller. It is a fully integrated two-switch buck controller featuring a constant frequency current mode control. It is suitable for a wide range of applications such as automotive body, climate, powertrain and HVAC services. It operates over a wide input voltage range, typically 8 to 48V and delivers up to an 85% or better efficiency. The SG3845DM uses an integrated voltage reference circuit to ensure a stable output voltage with minimal temperature drift, and a direct enable pin to control the enable state of the controller and the output voltage setting. SG3845DM is a great choice for automotive and other applications that require a high efficiency and accurate control.

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