Datasheet

13

002-34772 Rev. *F

2023-06-13

EZ-PD™ PAG2P primary-side startup controller

Functional description

3.10

Auto-restart timer

A fixed timer of TAR sec is available for various fault conditions. The timer is synched to the free-running oscillator.

The free-running oscillator will be running at FOSC.

3.11

Protection and fault condition

Primarily there are four type of protection actions used in various fault conditions.

• Auto-restart: In this mode, EZ-PD™ PAG2P will wait TAR sec before doing a soft-start. This sequence keeps

repeating continuously if fault condition persists (See Figure 11).

• Latch or shut-down: No Auto restart timer or soft-start is implemented. Shuts the IC down and power to the

IC needs to be removed to unlatch.

• GateOFF:ThisonlyturnsOFFthegatedrivepulseandwaitsforthefaultconditiontopassbeforethe ICfunctions

normally.

• Max duty cycle: Gate driver will be ON for 19 μs (maximum duty) during soft-start. When secondary is in control,

gate driver will be ON for 30 μs (maximum duty).

Figure 11

Auto-restart

TAR

SS

TAR

SS

TAR

SS