LM2596HV AC/DC to DC 5V-50V 3A Adjustable Buck Power Supply Module

LM2596HV AC/DC to DC 5V-50V 3A Adjustable Buck Power Supply Module is a wide-input step-down voltage regulator board built around the high-voltage LM2596HV switching IC, an onboard 4A bridge rectifier, and a 1000µF pre-filter capacitor bank. Unlike standard DC-only LM2596 modules limited to 35V DC, this board accepts either 5V–36V AC (directly from a step-down transformer secondary) or 5V–50V DC input and regulates it down to a continuously adjustable 3.3V to 33V DC output at up to 2.2A–3A.

Key Features:

• Accepts Both AC & DC Inputs (AC 5V–36V / DC 5V–50V): Onboard 4A full-wave bridge rectifier and high-voltage input filter capacitor allow direct connection to AC center-tapped/single-winding transformers as well as DC batteries.
• High-Voltage LM2596HV Regulator IC: Uses the 60V-rated LM2596HV chip fitted with an anodized aluminum heatsink for continuous high-voltage step-down operation.
• Adjustable 3.3V to 33V DC Output: Multi-turn 3296W potentiometer tunes the regulated DC output smoothly across 3.3V, 5V, 9V, 12V, 15V, 24V, up to 33V DC.
• Heavy-Duty Screw Terminal Blocks: Dual 2-pin barrier screw terminals (AC/DC Input and DC Output) enable fast, solder-free wiring.
• Built-In Thermal & Overcurrent Protection: Includes internal cycle-by-cycle current limiting (3A peak) and thermal shutdown protection.

Technical Specifications:

• Regulator IC: LM2596HV-ADJ (High-Voltage TO-220 / TO-263 with External Heatsink)
• AC Input Voltage Range: 5V to 36V AC (50Hz / 60Hz Transformer Secondary — NEVER connect directly to 220V AC mains!)
• DC Input Voltage Range: 5V to 50V DC
• Output Voltage Range: 3.3V to 33V DC Continuously Adjustable (VIN DC must exceed VOUT by ≥ 2V)
• Rated Output Current: 2.2A Continuous / 3.0A Peak
• Input Rectifier: 4A Full-Wave Bridge Rectifier + 1000µF Electrolytic Filter Capacitor
• Switching Frequency: 150 kHz
• Operating Temperature Range: -20°C to +85°C

Mechanical Specifications:

• PCB Material: FR-4 Double-Sided Fiberglass Board
• Cooling: Dedicated Finned Aluminum Heatsink on LM2596HV IC
• Terminals: 2 × 2-Pin 5.08mm Screw Terminal Blocks

Dimensions:

• Length: 51 mm
• Width: 26 mm
• Height: 22 mm
• Weight: ~26 g

Pinout and Wiring:

• AC / DC IN (2-Pin Screw Terminal): Connect 5V–36V AC from a step-down transformer secondary OR 5V–50V DC (non-polarized thanks to the onboard bridge rectifier). Warning: Do NOT connect to 110V/220V AC mains.
• OUT+ / OUT- (2-Pin Screw Terminal): Regulated 3.3V–33V DC output.
• 3296W Trimmer Potentiometer: Adjusts the DC output voltage.

Datasheet Reference:

• Primary IC Reference: LM2596HV 150kHz 60V 3A Step-Down Voltage Regulator

Commonly Used in:

• 12V / 24V / 36V AC Transformer Rectifier & Buck Regulator Stages
• 36V / 48V E-Bike & Telecom DC Bus to 5V/12V Step-Down Supplies
• 24V AC HVAC / Irrigation Transformer to 12V/5V DC Converters
• DIY Linear-Transformer Bench Power Supplies

Applications:

• Converts the raw 12V AC, 18V AC, or 24V AC output of an iron-core step-down transformer directly into a regulated 5V, 12V, or 24V DC supply without needing an external rectifier board.
• Steps down 36V or 48V electric bicycle/scooter battery packs (which exceed the 40V limit of standard LM2596S boards) to 12V for LED headlights and horns.
• Powers 5V/12V microcontrollers and cameras from 24V AC industrial control or landscape lighting transformers.

Equivalent Models:

• XL7015 5V-80V High-Voltage DC-DC Step-Down Buck Converter Module: Ultra-wide 5V–80V DC input buck module (0.8A output, DC input only).
• LM2596S DC-DC Buck Converter Adjustable Step-Down Power Supply Module: Standard 4V–35V DC-only buck converter module.

Package Includes:

• 1 × LM2596HV AC/DC to DC 5V-50V 3A Adjustable Buck Power Supply Module