Description
Product Overview
The LM2596 + LM2577C 15W Auto Step-Up/Down DC-DC Converter Module is a versatile, intelligent power management board that combines both step-up (boost) and step-down (buck) conversion capabilities in a single compact unit. Based on the high-performance XL6019 chip (a modern replacement for the LM2577/LM2596 combo), this module automatically adjusts to either increase or decrease the input voltage to maintain a stable, user-defined output .
What sets this module apart is its Constant Current / Constant Voltage (CC/CV) control with dedicated indicator LEDs. This feature makes it an exceptional choice for solar panel and wind turbine charging systems, where input voltage fluctuates significantly throughout the day . The module can charge various battery types—including 4V, 6V, 12V, 14V, and 24V lead-acid, lithium, nickel-cadmium, and nickel-metal hydride batteries—while protecting them from overcharging .
The module also functions as a high-power constant current LED driver, making it suitable for driving LED arrays without the need for external current-limiting resistors . With an output power rating of 15W (natural cooling) and conversion efficiency up to 80%, this module delivers reliable performance for DIY power supplies, battery chargers, and renewable energy systems .
Key Features
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Automatic Buck-Boost Operation: Automatically steps up (boosts) or steps down (bucks) input voltage (4-35V) to maintain a stable output between 1.25-25V, regardless of input fluctuations .
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CC/CV (Constant Current/Constant Voltage) Control: Enables precise battery charging with adjustable constant current (0-2A) and constant voltage, protecting batteries from overcharging .
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Dual-Color Charging Status Indicators: Red LED indicates charging in progress/constant current mode, Blue LED indicates charging complete (constant voltage mode) .
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15W Output Power: Capable of delivering up to 15W of output power (natural cooling); add a heatsink for operation beyond 15W .
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3A Maximum Output Current: Supports up to 3A output current (derate based on input-output voltage differential) .
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Solar/Wind Energy Optimized: Specifically designed for renewable energy applications where input voltage varies; ensure input power is at least 1.1x output power for solar applications .
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Adjustable Current Limit: Includes a dedicated potentiometer for setting the constant current limit (0-2A) .
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Adjustable Transition Current: The “revolving light current” (transition point from CC to CV mode) can be set between 1%-100% of the constant current value (default 10%) .
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Industrial Temperature Range: Operates reliably from -40°C to +85°C; above 40°C ambient, reduce power or add a heatsink .
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Output Short Circuit Protection: Features constant current protection that activates during output short circuits .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Input Voltage | DC 4V – 35V |
| Output Voltage | 1.25V – 25V (continuously adjustable) |
| Output Current (Max) | 3A (derate based on power) |
| Constant Current Range | 0 – 2A (adjustable) |
| Output Power (Max) | 15W (natural cooling) |
| Minimum Voltage Differential | 2V |
| Conversion Efficiency | Up to 80% |
| Switching Frequency | 150 kHz (LM2596) / 52 kHz (LM2577) |
| Operating Temperature | -40°C to +85°C |
| Full Load Temperature Rise | 45°C |
| Module Dimensions | 50mm × 37mm × 13mm |
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