NCP392B

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6

Operation

The NCP392B provides over−voltage protection for positive

voltage surge, up to +28 V. An additional clamp, between IN

and GND, protects the part against surge test, following IEC

61000−4−5 standard. A protected VBUS_DET output pin

provides a secondary supply for the platform biasing.

Under−voltage Lockout (UVLO)

To ensure proper operation under any conditions, the

device has a built−in under−voltage lock out (UVLO)

circuit. This circuit has a built−in hysteresis to provide noise

immunity to transient conditions.

Over−voltage Lockout (OVLO)

To protect connected systems on Vout pin from

over−voltage, the device has a built−in over−voltage lock

out (OVLO) circuit. During over−voltage condition, the

output remains disabled until the input voltage is above

OVLO – hysteresis.

Figure 4. UVLO, OVLO and /EN Functionality

/EN

VIN

OVLO

VOUT

UVLO

VBUS DET