BD9478F-GE2

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

BD9478F-GE2 application field and working principle

BD9478F-GE2 is an intelligent high-efficiency DC-DC converter for automotive applications, which is developed by Rohm Semiconductor Co., Ltd. The device integrates a highly efficient DC-DC buck regulator and three external control circuits that use the Step-Down conversion of the device to reduce the voltage and current of the automotive driven load. The BD9478F-GE2 device can be used in a variety of circuits including DC-DC power converters, engine start/stop modules, interior lighting modules, infotainment modules, automotive audio systems, ECUs, and power distribution modules.

Design Features

BD9478F-GE2 has a variety of design features, including:

• Integrated buck regulators with wide input voltage range (4.5V to 22V);
• Integrated current sensing and thermal sensing;
• Integrated over current, over voltage and under voltage protection circuits;
• Built-in output short-circuit protection;
• Integrated 6-bit Programmable On/Off time sequencer;
• Input voltage supply range from 4.5V to 22V;
• Output voltage range from 1.25V to 15V;
• Built-in N-channel IGBT switches, allowing up to 2000mA output current;
• Four control terminals;
• Temperature operation range: -40°C to 125°C.

Mode of Operation

The BD9478F-GE2 device operates in two modes: Step-Down Mode and Off-Time Control Mode. In Step-Down Mode, the device operates as a step-down converter, providing output voltage from 1.25V to 15V, depending on the input voltage. In Off-Time Control Mode, the device controls the on and off time of the MOSFET switch to regulate the output current.

Application Fields and Working Principles

The BD9478F-GE2 is most commonly used for DC-DC power converters for automotive applications, such as engine start/stop modules, interior lighting modules, infotainment modules, automotive audio systems, ECUs, and power distribution systems. The device is designed to reduce the voltage and current of the automotive driven loads in the most efficient way, by using the onboard buck regulator and external control circuit.

The device is designed with two control terminals: a current-sensing input (CSI) and voltage-sensing input (VSI). The current-sensing terminal allows the device to detect the output current of the system, while the voltage sensing terminal allows the device to detect the input voltage. When the device detects a change in voltage, it adjusts the output current accordingly, using the onboard buck regulator and external control circuit. This allows the device to efficiently reduce the current and voltage of the automotive driven load.

Additionally, the BD9478F-GE2 device has a built-in 6-bit programmable on/off time sequencer, which allows the user to control the on/off time of the switch of the device. This allows for better control of the output current, as well as providing a higher level of system protection, by preventing overheating or overvoltage of the system.

In order to maximize the efficiency of the device, it is important to ensure that the device is correctly wired and set up. For this, the user must refer to the instruction manual provided by the manufacturer. Additionally, it is also important to keep the device and the surrounding area away from dirt and dust, as these can interfere with the operation of the device.

Conclusion

The BD9478F-GE2 is a high-efficiency DC-DC converter designed for use in a variety of automotive applications. It has a variety of features, including integrated buck regulators with a wide input voltage range, 6-bit programmable on/off time sequencer, and current- and voltage-sensing terminals. The device is most commonly used in DC-DC power converters for automotive applications, allowing for efficient conversion of input voltage and current.

The specific data is subject to PDF, and the above content is for reference