The HiTron HSU45-10 is a 45 W switching mode power supply engineered for industrial and commercial VMEbus systems. This Eurocard-format unit delivers regulated 5 VDC at 9 A output with dual-selectable 115 Vac / 230 Vac input (47–63 Hz), making it suitable for distributed embedded applications demanding compact, reliable DC conversion. Forward-topology design ensures fast transient response and integrated protection against overload, short circuit, and overvoltage conditions.
## Technical Specifications
**Electrical Performance**
• Output: 5 VDC @ 9 A
• Input: 115 Vac / 230 Vac (47–63 Hz, user-selectable)
• Input current: 0.88 A @ 115 Vac; 0.44 A @ 230 Vac
• Line regulation: ±0.4% typ.
• Load regulation: ±1.0% typ. (main output)
• Efficiency: 70–75% typ.
• Switching frequency: 100 kHz typ.
• Transient response: 3 mS typ. (25% load step)
• Hold-up time: 20 mS @ 115 Vac / 50 mS @ 230 Vac
• Earth leakage: 0.3 mA typ. @ 230 Vac
**Physical & Thermal**
• Form factor: 3U × 6 HP × 160 mm (Eurocard, VMEbus-compatible)
• Weight: 537 g
• Cooling: Free air convection
• Operating temperature: 0 to +50°C (full load); derates to +70°C (half load)
• Storage temperature: −20 to +85°C
• Temperature coefficient: 0.04%/°C typ.
**Protection & Interfaces**
• Overload & short-circuit protection: Full
• Overvoltage protection: Latch-type at main output
• Remote sense: Installed on main output
• Remote logic inhibit: Available
• Power-fail signal: Installed
• Input fuse: T2.0A / 250 Vac
• Connectors: DIN 41612 (input/output, rear)
## Key Features
• Compact 3U Eurocard format fits standard VMEbus backplanes
• Dual input voltage selection eliminates region-specific supply concerns
• Built-in remote sense corrects line-drop errors in distributed systems
• Fast transient settling (3 mS) supports dynamic loads
• Low earth leakage meets Class I safety requirements
• Integrated power-fail notification for system monitoring
## Typical Applications
• Industrial control and process automation
• Embedded VMEbus systems and crate assemblies
• Commercial telecommunications equipment
• Instrumentation and test racks requiring regulated 5 V distribution
## Compatibility & Integration
The HSU45-10 conforms to IEC 60950-1 / UL 60950-1 Class I and meets CISPR 22 & FCC Class B EMI limits. DIN 41612 rear connectors ensure compatibility with standard Eurocard backplane installations. Remote inhibit and sense functions allow integration with larger power distribution and monitoring schemes. Limited current availability; replacement models such as HSU45-10N may be available from the manufacturer.
