Seagate Portable Hard Drive Portable External Hard Drive Quick Start Guide - Page 22
Appendix - power supply
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Appendix If you should need an external DC power supply, please ensure it meets the following specifications: AC input voltage: 90VAC to 264VAC AC input frequency: 47Hz to 63Hz Over-Voltage protection: Yes Short Circuit Protection (current limiting): Yes Nominal DC voltage: 5.4 VDC Max DC voltage variation from nominal under all conditions including temperature range, min to max current, and step load variations): +/- 4% Note. The max voltage at 0.0A shall be less than or equal to 5.62Vdc. Min voltage at 1.3A shall be greater than or equal to 5.18Vdc Step load variation: 0 to 90% Max current: 1.3A Power: 7W typical Ripple: 50mVp-p max from 10Hz to 100Mhz Efficiency: Better than 75% typical Temperature range: 0°C to 45°C Humidity: 20% to 90% Emissions: FCC class B, EN 55022 B Agency approvals: CSA, UL, CE, FCC 22 Quick Start Guide