GE DS3800NPSZ

Technical Parameters

Critical note: The DS3800NPSZ is a high‑efficiency, ultra‑low‑noise power board designed for sensitive instrumentation and communication applications. It employs resonant ZVS technology for minimal EMI and switching losses. Hot‑swapping is not supported. This board does not supply +24V auxiliary output.

Key Features & Advantages

• Zero‑Voltage Switching (ZVS) Technology – The DS3800NPSZ uses resonant ZVS topology, reducing switching losses and EMI to the lowest levels in the DS3800 family. This makes it ideal for applications where electrical noise must be minimized.

• Ultra‑Low Output Ripple – With < 5mVpp on the +5V rail and < 3mVpp on ±15V rails, the DS3800NPSZ delivers the cleanest power of any DS3800 power board—essential for high‑precision analog measurements and sensitive communication circuits.

• Highest Efficiency – At ~89% efficiency, the DS3800NPSZ generates less heat than any other DS3800 power board, making it ideal for densely packed cabinets with limited cooling.

• Excellent Regulation – Load regulation of ±0.1% and line regulation of ±0.05% ensure the most stable output voltages in the DS3800 family, even with varying input conditions or load changes.

• Full Isolation – 1.5kV isolation protects sensitive circuits from ground loops and transients.

• Basic Monitoring – Two analog feedback channels provide voltage telemetry for +5V and +15V, enabling remote monitoring of power health.

• Fault Indication – A digital fault output (open‑collector) triggers external alarms for overcurrent, short‑circuit, overtemperature, or undervoltage conditions.

• Compact Single‑Slot Design – Occupies only 4HP, making it ideal for space‑constrained instrumentation cabinets.

• Proven Reliability – The DS3800NPSZ is widely used in applications requiring the highest power quality.

Typical Application Cases

• High‑Precision Analog Signal Conditioning – Provides ultra‑clean power to analog isolators, transducers, and signal converters where power quality directly affects measurement accuracy.

• Sensitive Communication Modules – Powers fiber optic transceivers, serial communication modules, and protocol gateways requiring low‑noise, stable power.

• Instrumentation Cabinets – Supplies power to precision field instruments (pressure transmitters, temperature sensors) where electrical noise must be minimized.

• Vibration Monitoring Racks – Powers Bently Nevada interface cards and accelerometer conditioners, where clean power is essential for accurate vibration measurements.

• Test and Calibration Equipment – Used in laboratory environments where ultra‑low ripple power is essential for accurate measurements.

Competitive Comparison

The DS3800NPSZ is the premier low‑noise power board in the DS3800 family, offering the lowest ripple and highest efficiency through resonant ZVS technology.

Selection Guidelines & Precautions

1. Application Verification – The DS3800NPSZ is designed for sensitive instrumentation and communication applications where ultra‑low noise is critical. If your application does not require the lowest ripple, NPSP or NPSE boards may be more cost‑effective.

2. Power Budget – Calculate total current draw:

   • +5V: max 8A

   • ±15V: max 1.5A each
     Exceeding any output will trigger overcurrent protection and latch that output off.

3. ZVS Operation – The resonant ZVS topology requires a minimum load of approximately 10% of rated current to maintain proper zero‑voltage switching. If your load is very light (< 0.8A on +5V), the board may fall out of ZVS mode, resulting in higher ripple and EMI. Consider adding a dummy load if necessary.

4. Grounding for Full Isolation – Use separate returns:

   • IN_GND → Battery negative

   • OUT_GND → Rack logic ground
     Using a common ground defeats the isolation barrier.

5. Thermal Derating – Full output available up to 50°C:

   • 50°C–55°C: derate all outputs to 90% of rated current

   • 55°C–60°C: derate all outputs to 80% of rated current

   • Above 60°C: do not operate

6. EMI Considerations – Although the DS3800NPSZ generates the lowest EMI in the DS3800 family, ensure proper shielding and grounding of sensitive analog circuits to achieve optimal performance.

7. Compatibility – The DS3800NPSZ is pin‑compatible with all Mark IV backplanes in 4HP slots. No backplane modifications are required.

8. Spare Sourcing – Production ended in 2010. When purchasing refurbished units, request a load test report verifying output ripple < 5mVpp (+5V) and < 3mVpp (±15V) at full load at 25°C and 50°C. Visually inspect for capacitor bulging, discoloration, or burned traces. The DS3800NPSZ is the premier low‑noise power solution—prioritize this for instrumentation and communication applications requiring the highest power quality.