L6983 38 V Step-Down Converter

STMicroelectronics' L6983I is a device specifically designed for isolated buck topology. The primary output voltage can be accurately adjusted, whereas the isolated secondary output is derived by using a given transformer ratio. No optocoupler is required. The primary sink capability up to -4.5 A (even during soft-start) allows a proper energy transfer to the secondary side as well as enabling a tracked soft-start of the secondary output. The control loop is based on a peak current mode architecture and the device operates in forced PWM. The 390 ns blanking time filters oscillations, generated by the transformer leakage inductance, making the solution more robust.

The L6983 is an easy to use synchronous monolithic step-down regulator capable of delivering up to 3 A_DC to the load. The wide input voltage range makes the device suitable for a broad range of applications. The L6983 is based on a peak current mode architecture and is packaged in a QFN16 3 mm x 3 mm with internal compensation, minimizing design complexity, and size. The device is available both in low-consumption mode (LCM) and low-noise mode (LNM) versions.