FP6783 datasheet(10/11 Pages) FITIPOWER

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FP6783-Preliminary 0.3-NOV-2012

FP6783

fitipower integrated technology lnc.

Application Information (Continued)

Thermal-Overload Protection

The

FP6783

boost

converter

provides

Thermal-overload Protection to prevent excessive

power dissipation from overheating the IC. When the

junction temperature exceeds Tj=150°C, a thermal

sensor activates the fault protection, which shuts

down (latches) all outputs. The thermal sensor turns

internal circuitry on again after IC cycle the input

voltage to clear the thermal shutdown latch.

TEMP

(Tj)

TIME

150°C

Output Fault Protection

During steady-state operation, if feedback voltage

of the main regulator falls below 1.0V, positive

linear regulator falls below 1.0V or negative linear

regulator falls below 450mV, the FP6783 activates

an internal fault timer. If any condition indicates a

continuous fault for the fault timer duration (160ms

typ.) the IC sets the fault latch to shut down all its

output. Once the fault condition is removed, cycle

the VIN (below the UVLO falling threshold) to clear

the fault latch and reactivate the device. The

fault-detection

circuit

disabled

during

the

soft-start ramp.

Over Current Protection

The FP6783 has Over-Current Protection (OCP)

that limits the peak inductor current in every

switching cycle. It prevents large current from

damaging the inductor and diode. Once the

inductor current exceeds the current limit, the

internal switch turns off immediately and shortens

the duty cycle. The output voltage drops if the

over-current condition occurs. Current limit is

affected by the input voltage, duty cycle, and

inductor value.

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