The TPSI3050-Q1 represents a fully integrated, isolated switch driver. When combined with an external power switch, it forms a comprehensive isolated Solid-State Relay (SSR). SSRs offer three significant advantages over EMRs:

• Isolated Switch Driver: It provides flexibility to drive external Field-Effect Transistors (FETs) or Insulated Gate Bipolar Transistors (IGBTs). Compared to mechanical relays, SSRs demonstrate enhanced reliability, reduced weight, and smaller dimensions. The absence of mechanical moving contacts eliminates audible noise and physical circuit degradation.
• Rapid Switch Deactivation: The response time is less than 3μs, whereas relays typically operate in the range of 1-50ms, which is critical for protection during events such as overheating or overcurrent conditions.
• Secondary Bias Supply Generation: It generates secondary bias supply from power received on its primary side. The secondary side provides a regulated floating supply rail of 10V for driving various power switches.

Figure 3-1 illustrates the block diagram of this application. The TPSI3050-Q1 is controlled via an EN signal from a microcontroller. The VDRV pin drives the back-to-back MOSFETs in a common source configuration.

Figure 3-1 Block diagram of TPSI3050-Q1 in application

In summary, the principal distinction between this design and the approach described in Figure 1-1 lies in component selection. The TPSI3050-Q1 can replace traditional pre-charged mechanical relays, offering enhanced reliability, reduced dimensions, and improved response characteristics. For additional details, reference TIDA-050080 .