UCS3205 datasheet(19/30 Pages) MICROCHIP

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DS20006433A-page 19

UCS3205

4.13

Fault Handling

A Fault state means that at least one of the following

conditions has occurred:

• Short Circuit (SC signal),

• Overcurrent (OC signal),

• Overvoltage (OV signal),

• Thermal Shutdown (TSD signal), or

• Back-Voltage (BV signal) – Fault DOES NOT

apply when the Power Switch is off (EN = 0).

When the Fault state is detected, the digital logic turns

off the switch and asserts the FAULT# pin.

At the time when the Fault is detected, the UCS3205

discharges the output for the duration of tDISCHARGE. If

the LATCH pin is VIH at the time when the Fault is

detected, the digital logic remains in the Fault state until

the EN pin is toggled low-to-high, the Fault conditions

are no longer present (OV, TSD, BV) and the Fault

recovery procedure begins.

If the LATCH pin is VIL at the time when the Fault is

detected, the UCS3205 subsequently enters Auto-Retry

mode, where it runs the Fault recovery procedure every

tRETRY, until no Fault condition (Overvoltage [OV signal],

Thermal Shutdown [TSD signal], Back-Voltage [BV

signal if DIR = 0]) is detected or until the EN pin is pulled

low.

Figure 4-5 shows the Auto-Retry mode (LATCH pulled

low) Fault recovery timing in the case of a short circuit.

At the end of the Fault recovery procedure, if none of

the Fault conditions are met, the FAULT# pin is

deasserted and the power switch is turned on.

FIGURE 4-5:

Auto-Retry Mode Fault Recovery Timing – Short-Circuit Case.

VOUT

IOUT

Short

applied.

tDISCHARGE

VTST

Check short

condition. Short

still present.

FAULT# state

maintained.

Wait tRETRY.

400 µs

tRETRY

FAULT #

Short detected. VOUT

discharged. Enter Fault

state.

- Short Circuit (SC signal) – t

MASK does NOT apply

- Thermal Shutdown (TSD signal) – t

MASK does NOT apply

- Back-Voltage (BV signal) – t

MASK does NOT apply

- Overvoltage (OV signal ) – t

MASK does NOT apply

- Overcurrent (OC signal) – t

MASK implemented

SW_EN

OFF

tREADY

400 µs

Check short condition.

Short removed. Return to

normal operation.

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