Step-down converter

non-isolatedencapsulatedtelecom network

Overview
Buck (step-down) DC-DC converter converting DC24V input (18V–32V) to regulated DC13.8V ±0.25V output. Available in multiple output current variants from 1A to 20A suitable for industrial DC systems.

Key specifications

• Input voltage: DC24V (range 18V–32V)
• Output voltage: DC13.8V ±0.25V
• Output current variants: 1A, 3A, 5A, 10A, 15A, 20A
• Output power (nominal at 13.8V): 13.8W (1A) up to 276W (20A)
• Sizes (by variant): 46×32×18 mm (1A–3A); 66×58×23 mm (5A); 74×74×32 mm (10A–20A)
• Operating temperature: -20°C to 85°C

Features

• Synchronous rectification topology for high conversion efficiency
• Internal low-ESR capacitor filtering; high-temperature resistant
• Organic silicone potting/packaging for environmental protection
• Integrated chip protections: overcurrent and thermal protection
• Mechanical protections: anti-shock, drop-resistant, moisture and dust resistant
• High efficiency: typical values listed up to 96% (table shows 90% transfer efficiency)
• Non-isolated input-to-output design
• Ingress protection: IP67

Applications

• DC power distribution and step-down modules in industrial equipment
• Battery charging and maintenance at 13.8V for lead-acid systems
• Vehicle and off-grid DC systems requiring regulated 13.8V
• Telecom and control cabinets where sealed, high-efficiency converters are required

Installation & safety

• Observe polarity: positive and negative must not be reversed; reverse connection may damage the module and components
• Do not connect input and output in reverse; this may cause device failure
• Ensure load does not exceed the converter's maximum rated current/power
• Provide adequate thermal path or mounting for higher-current variants to ensure cooling
• Verify IP67 sealing and connector integrity in wet environments

Summary
Product Name | 24VDC to 13.8VDC Converter
Sizes (by group) | 46×32×18 mm (1A–3A) | 66×58×23 mm (5A) | 74×74×32 mm (10A–20A)
Output Current (variants) | 1A | 3A | 5A | 10A | 15A | 20A
Output Power (nominal at 13.8V) | 1A = 13.8W | 3A = 41.4W | 5A = 69W | 10A = 138W | 15A = 207W | 20A = 276W
Weight | 1A–3A = 53 g | 5A = 100 g | 10A–20A = 260 g
Input Voltage Range | DC24V (18V–32V)
Output Voltage | DC13.8V ±0.25V
Efficiency | Transfer efficiency listed 90%; features indicate up to 96%
Overheat protection | 150°C
Operating temperature | -20°C to 85°C
Waterproof | IP67

Technical specifications

• Type: Buck (step-down) DC-DC converter
• Isolation: Non-isolated input to output
• Protection: Overcurrent and thermal protection via control chip
• Filtering: Internal capacitor filter with low ESR
• Packaging: Organic silicone potting for environmental resistance
• Mounting: Variant-dependent; ensure adequate cooling for 10A–20A models