Description:The M78AR-1 series is a range of switching regulators designed as a drop-in replacement for old LM78xx linear regulators with low efficiency. The regulators come in a package which fits in the standard TO-220 footprint of linear regulators. The high efficiency and low stand-by power consumption of these switching regulators offer the designer a new, cost-efficient solution for many applications.
The recommended PCB layout involves placing the device on a multi-layer board with a solid ground plane, using thermal vias to dissipate heat, and keeping the input and output traces short and wide. A thermal pad on the bottom of the device should be connected to a copper plane for heat dissipation.
Ensure good airflow around the device, use a heat sink if necessary, and avoid blocking the airflow vents on the device. Also, follow the recommended PCB layout and thermal management guidelines to prevent overheating.
The device is designed to meet CISPR 22 Class B emissions standards. To minimize EMI and RFI, use a shielded enclosure, keep the input and output cables short and away from each other, and use EMI filters or common-mode chokes if necessary.
Yes, the M78AR05-1 can be used in a redundant or parallel configuration to increase power availability and reliability. However, ensure that the devices are properly synchronized and that the output voltages are matched to prevent damage or instability.
The derating curves for the M78AR05-1 are not explicitly provided in the datasheet. However, as a general guideline, the device's power rating should be derated by 1-2% per degree Celsius above the maximum operating temperature to ensure reliable operation.
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M78AR05-1 Overview
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