1. Product Overview

Product Name: DG4120
Model / Type: DG4120-1/2G
Series: DG 4120 / DG 4150 / DG 4150R CompactPCI Power Supply Series
Article Number: 15.9440.200
Manufacturer: (Not explicitly stated in the source, typically MGV Stromversorgungen GmbH or equivalent CompactPCI power supply manufacturer)
Product Category: CompactPCI DC-DC Power Supply Unit (3U, 12TE)
Description: The DG4120 is a high-performance, galvanically isolated DC-DC switching power supply designed for CompactPCI systems. It provides four regulated output voltages from a wide DC input range of 8.5 to 36 VDC, delivering up to 120 W total output power. The unit is built as a 19" 3U plug-in module with a 31-pin DIN connector interface for DC input and output connections.

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2. Key Features

- CompactPCI 3U Form Factor: Designed for integration into CompactPCI systems, compliant with DIN 41494 Part 5 mechanical standards.
- Wide Input Voltage Range: Accepts DC input from 8.5 V to 36 V (DG4120 variant), suitable for mobile, industrial, and embedded applications.
- Four Independent Output Voltages:
- +5.1 V / 0–14 A
- +3.3 V / 0–14 A
- +12 V / 0–2 A
- –12 V / 0–1 A
- Total Output Power: Up to 120 W continuous (DG4150 variants up to 150 W with forced ventilation).
- Galvanic Isolation: Full isolation between input and output circuits for enhanced safety and noise immunity.
- High Efficiency: 78–82% typical, depending on load and variant.
- Comprehensive Protection:
- Overvoltage protection (OVP)
- Overtemperature protection (OTP)
- Short-circuit protection (continuous short-circuit proof outputs)
- Inrush current limiting
- Control and Monitoring Interfaces:
- ENABLE (EN) and INHIBIT (INH) TTL control inputs
- DERATE (DEG) open-collector signal output for power status and derating indication
- Compliance with EMC and Safety Standards:
- EN 50081-1, EN 50082-2 (EMC)
- EN 60950 / VDE 0805 (Safety)
- Protection Class I (VDE 0100)
- Mechanical Flexibility:
- 19" rack plug-in module (12TE width, 3U height)
- Optional DIN-rail and wall-mounting kits available
- Thermal Management: Natural convection cooling with derating above +50°C; airflow from bottom to top must remain unobstructed.
- Visual Indicators: Green LEDs for all four output voltages.
- Robust Construction: Natural anodized aluminum front panel, approximately 1.0 kg total weight.

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3. Technical Specifications

Electrical Characteristics:
- Input Voltage (Ue): 8.5–36 VDC (DG4120)
- Input Current Protection: 25 A fuse integrated
- Inrush Current:
- Cold start: ~35 A peak (typical)
- Warm start: ~60 A peak (typical)
- Efficiency: 78–82% (variant-dependent)
- Isolation: Galvanic isolation between primary and secondary circuits
- Switching Type: DC-DC converter (Schaltregler)

Output Characteristics:
- Output Voltages and Currents:
- +5.1 V / 0–14 A
- +3.3 V / 0–14 A
- +12 V / 0–2 A
- –12 V / 0–1 A
- Total Output Power: 120 W maximum
- Voltage Adjustment Range: ±5%
- Ripple and Noise:
- Ua1, Ua2: <50 mVss
- Ua3, Ua4: <30 mVss
- Typical noise: 50 mVss (20 MHz bandwidth)
- Temperature Coefficient: 0.025% / K
- Soft-Start Behavior: No overshoot on power-up
- Rise Time:
- DG4120: ≤50 ms (Ua1, Ua2 <10 ms)
- DG4150R: <1 s
- Turn-On Delay: ≤0.5 s

Regulation:
- Line Regulation:
- Ua1, Ua2: ±0.2%
- Ua3, Ua4: ±0.5%
- Load Regulation:
- Ua1: ±0.1% (DG4150R <1%)
- Ua2: ±1%
- Ua3, Ua4: ±5%
- Transient Response: Recovery time ≤0.5 ms for load changes from 20–80%

Protection Features:
- Overvoltage Protection (OVP):
- Ua1, Ua2: 125% ±5%
- Ua3, Ua4: 125% ±10%
- Automatic recovery after fault removal
- Current Limiting:
- Ua1, Ua2: ~110% of nominal current
- Ua3, Ua4: ~140% of nominal current
- Short-Circuit Protection: Continuous, self-recovering
- Overtemperature Protection: Automatic shutdown at excessive internal temperature, auto-restart with hysteresis

Environmental Conditions:
- Operating Temperature: 0°C to +70°C
- Derating: 2% per K above +50°C (with free convection)
- Cooling: Natural convection (vertical airflow required)
- Weight: Approx. 1.0 kg

Mechanical Data:
- Form Factor: 19" 3U CompactPCI plug-in module
- Width: 12 TE (60.6 mm front width, 3TE handle width)
- Height: 3 HE (CompactPCI standard)
- Connector: DIN 41612 type M24/8 (31-pin)
- Front Panel: Natural anodized aluminum (Part No. 33.1594.000.011)

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4. Functionality

The DG4120 operates as a high-efficiency DC-DC converter designed for CompactPCI backplane systems. It converts a wide DC input voltage (8.5–36 VDC) into four regulated output voltages required by CompactPCI boards and peripheral modules. The galvanic isolation ensures electrical separation between input and output, improving safety and reducing interference.

Operation Principle:
The internal switching regulator topology provides stable, low-ripple DC outputs. The unit features soft-start circuitry to prevent voltage overshoot during power-up and includes inrush current limiting to protect both the power supply and upstream circuits.

Control and Monitoring:
- ENABLE (EN): Power output active only when EN is logic low (TTL).
- INHIBIT (INH): Forces power output off when logic low (TTL).
- DERATE (DEG): Open-collector signal indicating power status; low during startup, high 100–200 ms after voltage stabilization, and low ≥1 ms before power-down.
- LED Indicators: Green LEDs for each output voltage confirm operational status.

Applications:
- CompactPCI and industrial computer systems
- Embedded control systems
- Telecommunications and networking equipment
- Transportation and mobile electronics (due to wide DC input range)
- Industrial automation and instrumentation

Compatibility:
Fully compatible with CompactPCI mechanical and electrical standards. The DG4120 can be used interchangeably with other DG-series models (DG4150, DG4150R) depending on input voltage and redundancy requirements.

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5. Components & Accessories

Included Components:
- DG4120 power supply module (3U, 12TE)
- Front panel with integrated handle and LED indicators
- 31-pin DIN 41612 connector interface

Optional Accessories:
- Front Panel (Natural Anodized): Part No. 33.1594.000.011
- DIN-Rail Mounting Kit (35 mm): Part No. 15.7140.000.190
- Wall-Mounting Kit: Part No. 15.7140.000.290

Connectors:
- Input/Output Connector: DIN 41612 M24/8 (31-pin)
- PE (Protective Earth): Must be connected to the protective conductor of the supply network.
- Sense Lines: For 5V outputs (not available on DG4150R variant).
- Grounding: Common ground for all outputs (Ua1–Ua4).

Connection Notes:
For safe operation, +5VL must be connected to +5VF and OVL to OVF. Maximum voltage compensation per line is 0.25 V (not applicable to DG4150R).

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6. Installation & Setup

Mounting Options:
- Standard 19" rack installation (CompactPCI slot)
- Optional DIN-rail or wall mounting using accessory kits

Installation Requirements:
- Ensure unobstructed airflow from bottom to top for natural convection cooling.
- Maintain compliance with fire protection and system-level safety requirements.
- Connect the protective earth (PE) terminal to the system ground.
- Observe MGV user installation guidelines for CompactPCI systems.

Configuration:
- Verify input voltage range (8.5–36 VDC for DG4120).
- Connect outputs according to system requirements.
- Use ENABLE and INHIBIT control lines for power sequencing if required.
- Monitor DERATE signal for system diagnostics.

Startup Behavior:
- Soft-start ensures no overshoot on output voltages.
- Rise time ≤50 ms (Ua1, Ua2 <10 ms).
- DERATE signal transitions high 100–200 ms after voltage stabilization.

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7. Performance & Capabilities

Power Output:
- 120 W total continuous output power (DG4150 up to 150 W with forced cooling).
- Stable multi-output performance with low ripple and high regulation accuracy.

Efficiency:
- 78–82% typical, depending on load and variant.

Dynamic Response:
- Fast transient recovery (≤0.5 ms for 20–80% load change).
- No overshoot during startup or load transitions.

Thermal Performance:
- Operates from 0°C to +70°C ambient.
- Derates by 2% per K above +50°C under natural convection.
- Overtemperature protection ensures safe shutdown and automatic recovery.

Limitations:
- Requires adequate ventilation; forced cooling recommended for high-load or high-temperature environments.
- Maximum output power limited to 120 W (DG4120).
- Voltage sense lines must be properly connected for accurate regulation.

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8. Standards & Compliance

Safety Standards:
- EN 60950 / VDE 0805 (Information Technology Equipment Safety)
- Protection Class I (VDE 0100)

EMC Standards:
- Emission:
- EN 50081-1:1992
- EN 55011 / EN 55022 Class B (emission dependent on installation)
- Immunity:
- EN 50082-2:1992
- EN 61000-4-2 (ESD, severity level 4)
- EN 61000-4-3 (Radiated immunity, 10 V/m)
- EN 61000-4-4 (EFT/Burst, severity level 3/4)
- EN 61000-4-5 (Surge, severity level 4)
- EN 61000-4-11 (Voltage dips and interruptions)
- VDE 0160 (with automatic shutdown and restart)

Electrical Safety:
- SELV outputs according to EN 60950
- Primary and secondary overvoltage protection
- Galvanic isolation between input and output

Environmental Compliance:
- Designed for industrial environments with high EMC immunity
- Meets CompactPCI mechanical and electrical interface standards

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9. Additional Information

Warranty & Support:
- Standard manufacturer warranty (typically 12–24 months, depending on supplier).
- Technical support available for installation, configuration, and troubleshooting.

Maintenance:
- Virtually maintenance-free due to solid-state design.
- Periodic inspection recommended for connector integrity and airflow clearance.
- Ensure dust-free ventilation paths for optimal thermal performance.

Serviceability:
- Hot-plug capability not available on DG4120 (DG4150R variant supports redundancy and hot-plug operation).
- Replaceable via front extraction handle in CompactPCI chassis.

Product Variants:
- DG4120-1/2G (15.9440.200): Input 8.5–36 VDC, 120 W output
- DG4150-3G (15.9440.300): Input 36–76 VDC, 120 W output
- DG4150R-3G (15.9440.400): Input 36–76 VDC, 150 W output (redundant, hot-plug capable)

Updates & Documentation:
- Detailed datasheets and user manuals available from the manufacturer.
- Firmware-independent hardware device (no software updates required).

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Summary

The DG4120 CompactPCI Power Supply is a robust, high-efficiency DC-DC converter module engineered for industrial and embedded computing environments. With its wide input range (8.5–36 VDC), four isolated and regulated outputs, and compliance with stringent EMC and safety standards, it provides reliable power for CompactPCI systems and other demanding applications. Its modular 3U design, galvanic isolation, and comprehensive protection features make it a versatile and dependable choice for system integrators requiring stable, multi-output DC power in compact, high-reliability installations.