Newmar Power 32-12-50 DC Converter for Negative Ground Systems

32-12-50 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 the rating
• The 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): 50
• Output Amps (Continuous): 40
• Case Size (H x W x D): 6.2 x 6.8 x 18.1 inches (15.7 x 17.3 x 46.0 centimeters)
• Weight: 16 lb. (7.3 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. It 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 167 lbs.

The Newmar Power 32-12-50 DC Converter is designed to reliably convert 20-50 VDC input to a stable 12 VDC negative ground output, ideal for powering communication and navigation equipment in negative ground systems. This high-performance converter ensures consistent voltage regulation, maintaining output within 1% under various load and line conditions, which is critical for sensitive electronic devices. Its robust construction features a powder-coated aluminum heat sink case with large fins that maximize air contact, effectively dissipating heat generated by the semi-conductors for cool operation and long-term durability. The PC boards are conformally coated to resist corrosion, and the heavy-duty shock mounts provide resilience in harsh environments, making this converter suitable for demanding applications such as vehicles or remote installations.

Equipped with comprehensive protection circuits, the Newmar 32-12-50 includes current limiting, automatic thermal shutdown, short circuit proofing, reverse polarity protection, and overvoltage safeguards. These features enhance reliability and safety during operation, ensuring continuous performance even under adverse conditions. The converter's specifications include an output of 13.6 VDC, with an adjustable range from 12.6 to 14.5 VDC, capable of delivering up to 50 amps intermittently and 40 amps continuously, making it suitable for a variety of power needs. Its efficient switching at 40 kHz results in an 85% typical efficiency, minimizing energy waste and heat.

Designed for versatile use, the converter supports operation in temperatures from 0°C to 50°C, with linear derating at higher temperatures to prevent overheating. The unit features a compact size with a front panel terminal block, heavy-duty mounting flange, and conforms to safety standards with a 250 VDC isolation between input/output and chassis. Optional accessories include an extreme vibration mounting kit, which enhances durability in high-vibration environments like mobile or off-road applications. The converter is suitable for use as a battery charger or in parallel redundant configurations when derated to continuous duty, providing flexibility for complex systems. Overall, the Newmar Power 32-12-50 DC Converter offers a durable, efficient, and protected power solution for demanding industrial and vehicular applications.

Features:

• Excellent regulation: Maintains output voltage within 1% under all line and load conditions

• Effective heat dissipation: Large heat sink fins maximize air contact for cool operation

• Corrosion resistance: Conformal coating on PC boards and anodized aluminum case

• Robust protection circuits: Includes current limiting, thermal shutdown, short circuit proof, reverse polarity, and overvoltage protection

• High efficiency: Typical 85% switching efficiency at 40 kHz

• Versatile operation: Supports battery charging and parallel redundancy (derate required)

• Temperature resilience: Operates effectively from 0°C to 50°C with linear derating at higher temperatures

• Durable construction: Powder-coated housing, heavy-duty mounting flange, shock mounts for hostile environments

• Isolation: 250 VDC between input/output and chassis for safety