A7985A

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The A7985A is a high-efficiency, low-noise, high-integration DC-DC step-down power supply module integrating a continuous conduction mode (CCM) non-synchronous buck converter. The device is a complete DC-DC power conversion system for low to medium power industrial, medical and communications applications. It has high output voltage accuracy, low ripple and noise, fast transient response and low standby power losses.

A7985A operates with an input voltage range of 6.0V - 100V, and provides fixed output voltage down to 0.6V. It also has adjustable output voltage from 0.85V to 80V. The peak efficiency is up to 92%. It has up to 2.5A full load current capability and up to 5A peak current capability, making it suitable for applications that require high power density.

The A7985A DC-DC step-down converter integrates a synchronous rectifier structure and low power losses, providing up to 92% efficiency and low EMI services. The device operates with constant frequency, using an internal oscillator, and an automatic spread spectrum frequency control. This technology helps to reduce the magnitude of EMI created during high current transient. The A7985A also has integrated protection functions such as over-current protection, over-temperature protection, and under-voltage lockout protection.

The A7985A design uses a topology called a buck converter. The basic operation of this type of power converter consists of a switch and an inductor connected together. The switch allows the current to flow through the inductor when on, and disconnects the current flow when off. This provides the energy transfer from the input voltage to the output voltage. It also provides galvanic isolation, allowing for use in applications such as medical and communications.

When the switch is on, the inductor acts like an energy storage device. It stores energy, releasing it when the switch is turned off as an output from the inductor as a voltage spike. The voltage spike is then smoothed out by the output capacitor. This connected capacitor provides a much smoother DC output voltage. This buck-converter topology is relatively simple, yet provides a highly efficient, low-noise, low-ripple, and fast-transient solution.

The A7985A DC-DC step-down converter is designed to meet the exacting needs of industrial, medical, and communications applications. It provides high efficiency, low noise, and fast transient response. Its integrated protection functions, spread spectrum frequency control, and broad input voltage range make it a suitable choice for today’s demanding applications.

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