Newmar Power 32-12-25 DC Converter for Negative Ground Systems

32-12-25 DC Converter

Convert 20-50 VDC input to 12 VDC negative ground output for powering communication and navigation equipment on negative ground systems. (See Isolated Series for positive ground applications.)

Features:

• Excellent Regulation: Output voltage maintained within 1% under all line and load conditions within rating
• Heat generated by semi-conductors is extracted and dissipated by large heat sink fins that maximize air contact for cool operation and the long life of components
• Polyurethane conformal coating on PC boards and corrosion-resistant anodized aluminum cases with heavy-duty shock mounts assure survival in hostile environments

Numerous Converter and Load Protection Circuits:

• Current limiting
• Automatic thermal shutdown
• Short circuit proof
• Reverse polarity
• Overvoltage protection
• Carries CE mark

Specifications:

• Input Voltage: 20-50
• Output Voltage: 13.6
• Output Amps (Intermittent): 25
• Output Amps (Continuous): 20
• Case Size (H x W x D): 6.0 x 4.7 x 14.0 inches (15.2 x 11.9 x 35.6 centimeters)
• Weight: 7.5 lb. (3.4 kg)
• Output: 13.6 VDC (internally adjustable 12.6 -14.5) or 24.5 VDC (or specify)
• Ripple: 150 mV P-P maximum
• Regulation: 1% Line/Load
• Switching Frequency: 40 Khz
• Efficiency: 85% Typical.
• Isolation: Output/Chassis; Input/chassis: 250 VDC

Duty Cycle Ratings*:

• Intermittent: 20 minutes max on time, 20% duty. current limit set at approx. 105% of intermittent rating.
• Continuous: 24 hours, 100% duty *24-12-3: 2 minute max. on time
• Idle Current: Less than 100 mA (including power ON light)

Operating Temp Specifications:

• 0-50 degrees C, Derate Linearly From 100% @ 40 degrees C To 50% @ 50 degrees C.
• Thermal shutdown @ 70 degrees C Case Temperature
• Model 24-12-3: Full output -25 degrees to +30 degrees C; Derate linearly from 100% @ +30 degrees C to 45% @ +50 degrees C

Mechanical Specifications:

• Powder coated aluminum heat sink case
• Front panel terminal block
• Heavy duty mounting flange
• Conformal coated PC board

Options:

• Operation as a battery charger or parallel redundant operation* derate to continuous duty rating (contact factory)
• Extreme vibration mounting kit. (Information below)

Option: Extreme Vibration Mounting Kit

The Extreme Vibration Mounting Kit is available to protect NEWMAR power converters from the extreme stresses of shock and vibration when mounted on high-vibration vehicles. The kit replaces the standard vibration kit provided with the unit and fits into the units mounting flange to act as a super shock absorber for electronics in high vibration applications. It is available to fit all NEWMAR units from 2 to 70 lbs. Specify KIT L for units that weigh 215 lbs. and Kit H for units that weigh 167 lbs.

The Newmar Power 32-12-25 DC Converter is engineered to convert 20-50 VDC input into a stable 12 VDC negative ground output, ideal for powering communication and navigation equipment on negative ground systems. Designed for reliable operation in demanding environments, this converter features excellent voltage regulation, maintaining output within 1% under all line and load conditions, ensuring consistent power delivery. Its robust construction includes a large heat sink with fins for optimal air cooling, which helps dissipate heat generated by semi-conductors, prolonging component life and ensuring cool operation during extended use.

The unit is built with durability in mind, featuring polyurethane conformal coating on PC boards and a corrosion-resistant anodized aluminum case with heavy-duty shock mounts. These features enable the converter to withstand harsh environments, including exposure to moisture and vibration. Safety is prioritized with various converter and load protection circuits, such as current limiting, thermal shutdown, short circuit proofing, reverse polarity protection, and overvoltage protection, all carrying a CE mark for compliance. This broad protection suite ensures the converter's resilience and safe operation in critical applications.

Measuring approximately 6 inches high, 4.7 inches wide, and 14 inches deep, the converter weighs about 7.5 pounds, making it suitable for a variety of installation scenarios. It delivers a continuous output of 20 amps and an intermittent peak of 25 amps at 13.6 VDC, with an adjustable voltage range from 12.6 to 14.5 VDC. The converter operates efficiently with an typical efficiency of 85% and a switching frequency of 40 kHz, providing reliable power with minimal ripple. Its isolation ratings of 250 VDC between output and chassis, and input and chassis, enhance safety and system integrity.

Designed for versatile use, the Newmar Power 32-12-25 can be mounted on vehicles with high-vibration environments using an optional extreme vibration mounting kit. This kit acts as a super shock absorber, protecting internal components from shock and vibration stresses. The converter is suitable for continuous operation, with a thermal shutdown feature activating at 70°C to prevent overheating. Operating temperatures range from 0°C to 50°C, with derating applied at higher temperatures to ensure reliability. The powder-coated aluminum case, front panel terminal block, and heavy-duty mounting flange make installation straightforward and durable. Overall, the Newmar Power 32-12-25 DC Converter offers a dependable, high-performance power solution tailored for demanding communication and navigation systems in challenging environments.

Features:

• Excellent Voltage Regulation: Maintains output within 1% under all line and load conditions

• Heat Management: Large heat sink fins for optimal air contact and cooling

• Robust Construction: Polyurethane conformal coating and corrosion-resistant anodized aluminum case with shock mounts

• Comprehensive Protection: Current limiting, thermal shutdown, short circuit proof, reverse polarity, and overvoltage protection

• High Efficiency: Typical 85% efficiency with 40 kHz switching frequency

• Isolation: 250 VDC isolation between input, output, and chassis

• Adjustable Output: Internally adjustable voltage from 12.6 to 14.5 VDC

• Durable Design: Powder-coated aluminum case and heavy-duty mounting flange

• Versatile Use: Suitable for continuous or intermittent operation with optional vibration mounting kit

• Thermal Safety: Shutdown at 70°C to prevent overheating