Datasheet

11

002-37216 Rev. *B

2023-10-10

EZ-PD™ PAG2S-QZ integrated USB PD and secondary-side QR-ZVS

controller

Functional description

The voltage at the drain node of the external NFET is sensed on the SR_SEN pin connected via an external resistor.

The external resistor is required to restrict the voltage at the SR_SEN pin below 34 V. The external resistance on

the SR_SEN pin depends on the turns ratio of the power transformer. Table 2 provides the external resistor values

required for different turns ratios.

Table 2

External resistance on SR_SEN vs. turns ratio

Primary: Secondary turns ratio

Rext ()

3:1

20k

4:1

20k

5:1

20k

6:1

12k

7:1

12k

8:1

12k

9:1

12k

10:1

12k

11:1

12k

12:1

12k

13:1

12k

14:1

12k

15:1

12k