| Environmental Conditions |
| Project | Technical Specifications | Unit | Remarks |
| Operating Temperature | -25—+55 | ℃ | Starts at -40°C, no performance requirements; |
| Storage temperature | -40—+85 | ℃ | |
| Relative humidity | 5—95 | % | non-condensing |
| Elevation | -60—5000 | m | Within the range of 1800m to 5000m, the maximum temperature rating decreases by 1°C for every 220m increase in altitude. |
| Acoustic Noise | ≤63(Sound power) | dBA | 35 degrees, 555W, 48Vdc input; tested in 6 directions at a distance of 1 meter. |
| Heat dissipation | Features built-in fan for air-cooled heat dissipation. Power supply panel exhausts air from the side (airflow direction: from output terminals to input terminals). |
| Anti-corrosion requirements | Meets the requirements for B1-class environmental corrosion resistance; |
| Input Characteristics |
| -48V input voltage range | -38.4—-72(Rated -48) | Vdc | 1. Input must withstand -80Vdc/+80Vdc continuously without damage to the power supply, with acceptance testing conducted after 4 hours. |
| +48V Input Voltage Range | 40—57(Rated +48) | Vdc | 2. The input can withstand -100V/100ms and +100V/100ms for short durations without damaging the power supply. |
| -48V Input Specification Definition: Connect the positive input terminal [RTN(+)] to ground in accordance with the customer's system. For this individual power supply unit, connect the high-potential input to the [RTN(+)] terminal of the power input port, and connect the low-potential input to the [NEG(-)] terminal of the power input port. |
| +48V Input Specification Definition: Connect the negative input terminal [NEG(-)] to ground in accordance with the customer's system. For this single-unit power supply, connect the high input potential to the [RTN(+)] terminal of the power input port, and connect the low input potential to the [NEG(-)] terminal of the power input port. |
| Maximum Input Current | 38 | A | Vin=-38.4Vdc/+40Vdc，Pout=1200W |
| Input surge current | Complies with ETSI 300 132-2 |
| Input Soft-Start Circuit | The power input port incorporates a soft-start circuit. Prior to soft-start activation, the total capacitance of the EMI filter capacitors is less than 25uF to prevent voltage drops when device power increases. |
| Output Characteristics |
| Output Voltage Setpoint | 12.2—12.4(Typical value 12.3) | Vdc | Factory-set voltage; |
| Rated input, 1A output, 25°C operating temperature. |
| Output Voltage Range | 11.85—12.45 | Vdc | Full-range (operating temperature, input voltage, output load) testing and acceptance. |
| (Typical value 12.15) |
| Output Power | 1200 | W | |
| Minimum load | 20 | W | The unit can be started and operate normally under no-load conditions. |
| Voltage Regulation Accuracy | ≤±2.5 | % | Full input, output, and temperature range |
| Source adjustment rate | ≤±1 | % | Rated current output, full voltage range variation |
| Load Regulation | ≤±2 | % | Rated voltage input, full load variation |
| Output Efficiency | ≥89 | % | 100% load, Vin=48V, ambient temperature, externally powered fan; |
| ≥92 | % | 50% load, Vin=48V, ambient temperature, externally powered fan; |
| ≥90 | % | 20% load, Vin=48V, ambient temperature, fan powered externally; |
| Output ripple and noise | ≤200 | mVp-p | Full input range, ambient temperature -5 to 55°C; Pout > 20W |
| (During testing, connect one 0.1uF ceramic capacitor and one 10uF electrolytic capacitor in parallel at the output terminal; oscilloscope bandwidth set to 20MHz;) | ≤300 | mVp-p | Full input range, ambient temperature -25 to -5°C; |
| ≤300 | mVp-p | Pout≤20W |
| ≤120 | mVp-p | Full input range; Ambient temperature: 5–55°C; Pout ≥ 20W; |
| Output terminal with capacitive load 540uF; |
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