A power supply with over-voltage protection comprising: a primary voltage converter having a first voltage input and a second voltage output, and overvoltage protection components (123, 124), wherein the primary voltage converter is an isolated DC/DC voltage converter; a first low dropout regulator connected to receive said second voltage and to generate a third voltage; first circuitry configured to be powered by the third voltage, wherein the first low dropout regulator and the first circuitry are configured such that the third voltage is within an acceptable operating range of the first circuitry, and that in the event of an input-to-output short-circuit fault of the first low dropout regulator, the first low dropout regulator outputs the second voltage which is within the acceptable operating range of the first circuitry; a second low dropout regulator connected to receive said second voltage and to generate a fourth voltage; and a third low dropout regulator connected to receive said fourth voltage and to generate a fifth voltage; second circuitry configured to be powered by the fifth voltage, wherein the third low dropout regulator and the second circuitry are configured such that the fifth voltage is within an acceptable operating range of the second circuitry, and that in the event of an input-to-output short-circuit fault of the third low dropout regulator, the third low dropout regulator outputs the fourth voltage which is within the acceptable operating range of the second circuitry; and wherein the overvoltage protection components (123, 124) of the primary voltage converter are configured to prevent the second voltage from rising above tolerance levels of the first low dropout regulator and the second low dropout regulator. a primary voltage converter having a first voltage input and a second voltage output, and overvoltage protection components (123, 124), wherein the primary voltage converter is an isolated DC/DC voltage converter; a first low dropout regulator connected to receive said second voltage and to generate a third voltage; first circuitry configured to be powered by the third voltage, wherein the first low dropout regulator and the first circuitry are configured such that the third voltage is within an acceptable operating range of the first circuitry, and that in the event of an input-to-output short-circuit fault of the first low dropout regulator, the first low dropout regulator outputs the second voltage which is within the acceptable operating range of the first circuitry; a second low dropout regulator connected to receive said second voltage and to generate a fourth voltage; and a third low dropout regulator connected to receive said fourth voltage and to generate a fifth voltage; second circuitry configured to be powered by the fifth voltage, wherein the third low dropout regulator and the second circuitry are configured such that the fifth voltage is within an acceptable operating range of the second circuitry, and that in the event of an input-to-output short-circuit fault of the third low dropout regulator, the third low dropout regulator outputs the fourth voltage which is within the acceptable operating range of the second circuitry; and wherein the overvoltage protection components (123, 124) of the primary voltage converter are configured to prevent the second voltage from rising above tolerance levels of the first low dropout regulator and the second low dropout regulator.