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UCC24636

SLUSCG2A – MARCH 2016 – REVISED MARCH 2016

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Feature Description (continued)

8.3.4 Pin Fault Protection

The UCC24636 controller includes fault protection in the event of open pin, shorted pin to ground and abnormal

out of range operation.

8.3.4.1 VPC Pin Overvoltage

In the event that there is an abnormal high level on the VPC pin for a period beyond expected transformer

leakage spike duration, the DRV output is disabled on a cycle-to-cycle basis. If the voltage on the VPC pin

8.3.4.2 VPC Pin Open

In the event of an open circuit VPC pin, the device defaults to a zero VPC input signal condition which results in

disabling DRV operation.

8.3.4.3 VSC Pin Open

In the event of an open circuit VSC pin, the device defaults to a zero VSC input signal condition which results in

disabling DRV operation.

8.3.4.4 TBLK Pin Open

In the event of an open circuit TBLK pin, the device disables DRV operation.

8.3.4.5 VPC and VSC Short to Ground

Since the VPC and VSC enable thresholds must be satisfied for DRV operation, DRV is inherently disabled.

8.3.4.6 TBLK Pin Short to Ground