Which is the best way to solve the power supply problem?
A central power management controller is the best way to solve this problem. As the number of supply voltages increases, there is a much higher probability of things going wrong. The risk increases in proportion to the number of supplies, number of elements, and complexity of the system. External factors also add risk.
When does risk increase in a power supply?
The risk increases in proportion to the number of supplies, number of elements, and complexity of the system. External factors also add risk.
When to apply core voltage to power supply?
For example, consider a common requirement for power-supply sequencing: an FPGA (field-programmable gate-array) manufacturer may specify that the 3.3-V core voltage must be applied 20 ms before the 5-V I/O (input/output) voltage to avoid possible damage when the device is powered up.
Can a power supply sequencing IC be used?
A wide variety of power-supply-sequencing ICs is available. Some devices have outputs that can be used to enable power modules directly, and numerous output configurations are available. Some include on-board charge-pump voltage generators.
What kind of resistor is in 5V power supply?
Some computers’ 5V power supply regulators are rated as high as 1A. With the amperage that high, a protection device is needed. A current-limiting resistor circuit is built into the computer’s 5V supply. It’s there to protect the circuit from this sort of problem.
What kind of problem is a 5V reference wire?
An example of this was a 2008 Subaru Outback that was towed in with a no-start condition. The vehicle cut out on the customer while he was driving. The wiring harness had rubbed on a support bracket under the intake manifold. The 5V reference wire was the first wire in the harness to be grounded.
What happens when a 5V reference circuit is short to ground?
(Ohm’s law simplified: 5V ÷ 50 ohms = .1A.) Based on test results, the 5V limiting resistor circuit design is more than just a simple resistor. The circuit can effectively minimize the amperage draw. This means that when a circuit becomes only partly shorted to ground, the voltage can be forced to drop between 1 and 4V.
What to do if your 5V reference circuit is dead?
When you confirm that the 5V reference circuit is dead, you need to locate the source of the problem. The reference circuit may have as many as five to nine wires from the computer to different sensors on the vehicle. Where do you start looking? As with any electrical problem, you need to review the vehicle’s wiring schematic.