RDR-292: 3.13A @ 50.4V Max, 90 ~ 265VAC in

1 января 2018

This engineering report describes a 48 V, 150 W reference design power supply for 90 VAC — 265 VAC LED street lights which can also serve as a general purpose evaluation board for the combination of a PFS power factor stage with an LCS output stage using devices from the Power Integration’s HiperPFS and HiperLCS device families.

The design is based on the PFS708EG IC and LQA05TC600 diode for the PFC front end, with a LNK302DG utilized in a non-isolated flyback bias supply. An LCS702HG IC is used for the LLC output stage.

The circuit shown in this report is optimized for >0.9 power factor, over an input voltage range of 90 VAC — 230 VAC, at both 100% load and 50% load. If >0.9 power factor is not required at 50% load, the circuit can be cost reduced by downsizing common mode filter L1 and PFC input capacitor C6. Contact Power Integrations for more details.

This power supply is designed to be mounted inside a grounded enclosure for streetlight service, with the input AC safety ground connected to the chassis. EMI and line surge tests should be performed with the supply screwed down to a ground plane with the input AC safety ground connected to this plane.