Laptop Computer Power Supply Circuit

Posted on Sep 29, 2012

A laptop computer supply that has 9-V output, crowbar overvoltage protection, and operates i`rom a 12-V supply is shown above. The supply voltage should be at least 3.6 V above the expected output voltage. Ql should be heatsinked appropriately. R5 should have a value of 1.5 1: for 9-V output. Table 1 gives values for other voltages. Note: Any output voltage value greater than 10V requires a higher input voltage than 13.6V. In addition capacitor working voltage ratings will have to be increased accordingly.

Laptop Computer Power Supply Circuit
Click here to download the full size of the above Circuit.

Allow a minimum of 2.5 times the voltage expected to appear across the capacitor as a standard for the working voltage.

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