An uncomplicated block diagram (a) conceals the TL431's internal complexity, but you need only three external resistors to use the TL431 in a basic shunt-regulator circuit (b)

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Other Materials from the Main Document

• Article «Shunt regulator eases power-supply-start-up woes»
• Figure 1. An uncomplicated block diagram (a) conceals the TL431's internal complexity, but you need only three external resistors to use the TL431 in a basic shunt-regulator circuit (b)
• Figure 2. An auxiliary winding supplies power to the supply's PWM controller
• Figure 3. In this improved design, pulse-width-controller IC₁ derives its power from R_T for start-up, auxiliary winding W_AUX for normal operation, and shunt-regulator circuit IC₂ and Q₁ for low-load operation
• Standard precision GNSS module. Datasheet MIA-M10Q