Biostar TA75A+ Motherboard

Voltage Regulator

The CPU voltage regulator circuit of the Biostar TA75A+ has four phases for the CPU
main voltage (VDD a.k.a. Vcore) and one for the CPU VDDNB voltage (integrated memory controller). We couldn’t figure out how the CPU VDDP voltage (integrated video controller) is generated, and probably doesn’t have a separate voltage regulator. Therefore, this motherboard uses a “4+1” configuration.

Figure 8: Voltage regulator circuit

Figure 9: Voltage regulator circuit

This motherboard uses solid ferrite-core coils, which present less energy loss than iron-core coils (i.e., they improve efficiency) and solid capacitors.

The motherboard provides a series of five LEDs for you to monitor its phases. See Figure 10.

Figure 10: LEDs for monitoring the CPU voltage phases

If you want to learn more about the voltage regulator circuit, please read our tutorial on the subject.