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3 Amp DC-DC Step-Down Module

A C Wyatt BSc FIP3, The Valve Museum, November 24, 2021.
    
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The module as advertised on ebay.

This little step-down converter was designed for battery charging and the centre pot controls when charging is complete. this function is not required in the amplifier application.

Input voltages range from 7 - 35 Volts and the output voltage range is 4 - 35 Volts. The maximum output current is 3 Amps and in total the power output at maximum voltage is 15 Watts. The output is non-isolated and so the ground is common to input and output.

The heater requirement for the Dynaco amplifier is 1.2 Amps and the measured requirement for the first mono bloc was 1.3 Amps. Setting the maximum current to 1.5 Amps keeps the device to around 50% of maximum. When the heaters are hot the power requirement is 8.2 Watts maximum.

The input voltage was set to 19.5 Volts on the bench power supply. Initially the voltage was set to 6.3 Volts off load. To set the current limit a QQV03-20A was used as a dummy load as the steady state current at 6.3 Volts was 1.3 Amps. The heater was run from cold at different current settings until the maximum inrush was kept at 1.5 Amps.

After soak testing with the dummy load was found to not raise any component above just warm to the touch the module was ready for the amplifier.

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