MEAN WELL 350W Single Output DC-DC Converter - SD-350 Series

Key Features

2:1 wide input range
Protections: Short circuit / Overload / Over voltage / Over temperature
1500VAC I/O isolation
Forced air cooling by built-in DC Fan
100% full load burn-in test
24V and 48V input voltage design refer to LVD
2 years warranty

Specifications

Model	DC Voltage	Rated Current	Current Range	Rated Power	Ripple & Noise (max.) Note.2	Voltage Adj. Range	Voltage Tolerance Note.3	Line Regulation	Load Regulation	Setup, Rise Time	Input Voltage Range	Efficiency (Typ.)	DC Current (Typ.)	Inrush Current (Typ.)
SD-350B	5V	57A	0~57A	285W	100mVp-p	4.5~5.5VDC	±2.0%	±0.5%	±1.0%	300ms, 50ms	B:19~36VDC	74%	14.4A/24V	C:45A/48VDC
SD-350B	12V	27.5A	0~27.5A	330W	120mVp-p	11~16VDC	±1.0%	±0.3%	±1.0%	300ms, 50ms	B:19~36VDC	80%	16A/24V	C:45A/48VDC
SD-350B	24V	14.6A	0~14.6A	350.4W	150mVp-p	23~30VDC	±1.0%	±0.2%	±1.0%	300ms, 50ms	B:19~36VDC	80%	17.6A/24V	C:45A/48VDC
SD-350B	48V	7.3A	0~7.3A	350.4W	200mVp-p	43~53VDC	±1.0%	±0.2%	±1.0%	300ms, 50ms	B:19~36VDC	84%	17.6A/24V	C:45A/48VDC
SD-350C	5V	60A	0~60A	300W	100mVp-p	4.5~5.5VDC	±2.0%	±0.5%	±1.0%	300ms, 50ms	C:36~72VDC	76%	7.6A/48V	D:45A/96VDC
SD-350C	12V	27.5A	0~27.5A	330W	120mVp-p	11~16VDC	±1.0%	±0.3%	±1.0%	300ms, 50ms	C:36~72VDC	81%	8.8A/48V	D:45A/96VDC
SD-350C	24V	14.6A	0~14.6A	350.4W	150mVp-p	23~30VDC	±1.0%	±0.2%	±1.0%	300ms, 50ms	C:36~72VDC	81%	9.0A/48V	D:45A/96VDC
SD-350C	48V	7.3A	0~7.3A	350.4W	200mVp-p	43~53VDC	±1.0%	±0.2%	±1.0%	300ms, 50ms	C:36~72VDC	82%	9.0A/48V	D:45A/96VDC
SD-350D	5V	60A	0~60A	300W	100mVp-p	4.5~5.5VDC	±2.0%	±0.5%	±1.0%	300ms, 50ms	D:72~144VDC	78%	6A/96V	D:45A/96VDC
SD-350D	12V	29.2A	0~29.2A	350.4W	120mVp-p	11~16VDC	±1.0%	±0.3%	±1.0%	300ms, 50ms	D:72~144VDC	83%	6A/96V	D:45A/96VDC
SD-350D	24V	14.6A	0~14.6A	350.4W	150mVp-p	23~30VDC	±1.0%	±0.2%	±1.0%	300ms, 50ms	D:72~144VDC	87%	6A/96V	D:45A/96VDC
SD-350D	48V	7.3A	0~7.3A	350.4W	200mVp-p	43~53VDC	±1.0%	±0.2%	±1.0%	300ms, 50ms	D:72~144VDC	89%	6A/96V	D:45A/96VDC

Protection Features

Overload Protection

105~135% rated output power. Protection type: Shut down o/p voltage, re-power on to recover.

Over Voltage Protection

Refer to output voltage specifications (e.g., 5.75~6.75V for 5V models, 16.8~20V for 12V models, 31.5~37.5V for 24V models, 53~65V for 48V models). Protection type: Shut down o/p voltage, re-power on to recover.

Over Temperature Protection

Shut down o/p voltage, recovers automatically after temperature goes down.

Environmental Specifications

Working Temp: -20~+60°C (Refer to "Derating Curve")
Working Humidity: 20~90% RH non-condensing
Storage Temp., Humidity: -40~+85°C, 10~95% RH
Temp. Coefficient: ±0.03%/°C (0~50°C)
Vibration: 10~500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes

Safety & EMC

Safety Standards: EAC TP TC 004 approved, design refer to AS/NZS 62368.1, BS EN/EN 62368-1, IEC/BS EN/EN 62368-1.
Withstand Voltage: I/P-O/P:1.5KVAC, I/P-FG:2KVAC, O/P-FG:0.5KVAC
Isolation Resistance: I/P-O/P, I/P-FG, O/P-FG: 100M Ohms / 500VDC / 25°C/70% RH
EMC Emission: Compliance to BS EN/EN55032 (CISPR32) Class B, EAC TP TC 020
EMC Immunity: Compliance to BS EN/EN61000-4-2,3,4,6,8, BS EN/EN55035, light industry level, EAC TP TC 020

Other Specifications

MTBF: 1705.6K hrs min. (Telcordia SR-332); 263.9K hrs min. (MIL-HDBK-217F @ 25°C)
Dimension: 215*115*50mm (L*W*H)
Packing: 1.1Kg; 12pcs/14.4Kg/0.9CUFT

Diagram Descriptions

Mechanical Specification Diagram

Illustrates the physical dimensions of the unit (215mm length, 115mm width, 50mm height) with mounting hole details (e.g., 4-M4 holes on the perimeter, 6-M3 holes for fan mounting). Includes terminal pin assignments for DC input (Pin 1: DC INPUT V+, Pin 2: DC INPUT V-), DC output (Pin 4,5,6: DC OUTPUT V-, Pin 7,8,9: DC OUTPUT V+), and FG (Frame Ground, Pin 3).

Block Diagram

Depicts the internal functional blocks of the DC-DC converter: Input stage with EMI Filter, Rectifiers & Filter (specific to D series), Power Switching, Output stage with Rectifiers & Filter, and control circuits including PWM Control, OVP (Over Voltage Protection), OLP (Over Load Protection), OTP (Over Temperature Protection), and a Detection Circuit. A fan is included for cooling. The switching frequency (fosc) is 100KHz.

Derating Curve

A graph showing the relationship between Load (%) and Ambient Temperature (°C). It indicates that the unit can operate at 100% load up to approximately 50°C, after which derating is required. The curve is labeled for SD-350B,C,D-5 models.

Static Characteristics

A graph illustrating Load (%) versus Input Voltage (V). It shows the typical output load capacity across different input voltage ranges: B (19-36VDC), C (36-72VDC), and D (72-144VDC). The output load generally remains stable across the specified input voltage ranges.

Notes

All parameters are measured at specified input voltages (24V, 48V, 96VDC), rated load, and 25°C ambient temperature unless otherwise noted.
Ripple & noise are measured with a 20MHz bandwidth using a 12" twisted pair-wire terminated with a 0.1µF & 47µF parallel capacitor.
Tolerance includes set-up tolerance, line regulation, and load regulation.
The power supply is considered a component for installation into final equipment. EMC tests were performed by mounting the unit on a 360mm x 360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed for EMC compliance. Refer to "EMI testing of component power supplies." (as available on http://www.meanwell.com) for guidance.
The ambient temperature derating is 3.5°C/1000m for fanless models and 5°C/1000m for fan models for operating altitudes above 2000m (6500ft).

External Resources

For GTIN code search: MEAN WELL Service GTIN
Product Liability Disclaimer: MEAN WELL Disclaimer

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