The device allows for a variety of applications by using the AVIN and PVIN pins together or separately. The AVIN pin voltage supplies the internal control circuits of the device. The PVIN pin voltage provides the input voltage to the switching power stage. When connected to a single supply, the input voltage for AVIN and PVIN can range from 4 V to 16 V. If the PVIN is connected to separate supply from AVIN, the PVIN voltage can be 2.95 V to 16 V, and AVIN has to meet 4-V minimum and 18-V maximum to drive the control and driver. If AVIN is connected to the same supply as PVIN or VDD5, TI recommends a minimum 10-µs R-C filter with a 1-Ω to 10-Ω resistor and AVIN bypass capacitor between AVIN and PVIN to reduce PVIN switching noise on the AVIN input.

Figure 7-2 TPS546D24S Separate PVIN and AVIN Connections

Figure 7-3 TPS546D24S Separate PVIN and AVIN Connections with VDD5

Figure 7-4 TPS546D24S Separate PVIN, AVIN, and VDD5 Connections