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6V LDO Solar Charge Controller

2015-03-01 20:38  
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6V LDO Solar Charge Controller
This Low Dropout Voltage (LDO) solar charge controller is a variation of the previously posted 12V LDO controller. It is optimized for charging a 6V lead-acid battery with a 9V solar panel. Minimum voltage drop is less than 1V. It uses a simple differential amplifier and series P channel MOSFET linear regulator. Voltage output is adjustable. It may also be applied in two or four cell lead-acid applications (4V & 8V).It is not recommended for 12V applications. 6 Volt solar charge controller schematic 6V Solar Charge Controller Specifications Max solar panel rating: 50W (8A, 6V nominal) (open circuit voltage: 9 to 10V) Output voltage range: 4.7 to 9.8V (adjustable) (not recommended for 12V applications) Max power dissipation: 16W (includes power dissipation of D3) Typical dropout voltage: 0.9V @ 8A (less @ lower currents) Maximum current: 8A (current limiting provided by solar panel characteristics) Voltage regulation: 80mV (no load to full load) Battery discharge: 1mA (Chinese controls discharge at typically 5mA) LED indicators: RED: Solar panel active GREEN: Series regulator limiting current (fully charged or topping off) Reverse battery protection: Control shuts down if battery is inadvertently connected reverse Operation at lower current/power While designed for 8A, 50W, it will function just as well at much lower current /power. LDO Solar Charge Control Photos Perf board—sorry, no circuit board artwork at the time of publication.