MEAN WELL SD-350D-48 DC-DC Converter, 72 to 144 V DC Input, 48 V 7.3 A 350.4 W

Overview

What it is

The MEAN WELL SD-350D-48 is an enclosed single-output DC-DC converter from the SD-350 series. The ‘D’ in the code is the input range, 72 to 144 V DC, and the ‘-48’ is the output: a regulated 48 V at up to 7.3 A, 350.4 W.

What it is used for

It powers 48 V loads such as telecom and network equipment or Power over Ethernet (PoE) switches that need a 48 V rail from a higher-voltage DC source in the 72 to 144 V range, such as a 96 V or 110 V battery or DC bus. The input and output are isolated, so the low-voltage side is separated from the supply.

Key features

• Input 72 to 144 V DC (2:1 wide range); typical input current 6 A at 96 V DC.
• Output 48 V, adjustable 43 to 53 V DC; ripple and noise 200 mVp-p maximum.
• Typical efficiency 89%; cooling by free air convection.
• Protection against short circuit, overload (105 to 135% of rated power), over voltage (53 to 65 V) and over temperature.
• 1500 V AC input to output isolation.
• Operating range -20 to +60 °C with derating; 215 x 115 x 50 mm, 1.1 kg.

Buying considerations

Pick the input letter to match your source: the series also has B and C versions with lower input ranges, sold as separate products. Leave current headroom and check the derating curve. MEAN WELL gives a 2 year warranty in the datasheet.

Compatibility and What You Need

MEAN WELL treats the converter as a component to be built into final equipment, so electromagnetic compatibility (EMC) and safety should be confirmed for the complete installation. Provide input protection and suitably rated cables for the 7.3 A output current.