FUNCTIONAL DESCRIPTION

When the load current rise above the current cut off level, S1 is automatically switched off and the

devices operates in recirculation mode (S2 active). S1is latched off until A goes low and high again.

This default is not displayed by diagnostic flag.

If the load current is below the open load current level, the flag of the open load block is activated but

this default is displayed by the diagnostic output on the falling edge of input B and the diagnostic output

is latched at low level until input A goes low and high again. In case an open load is detected during an

active phase of input B, but disappears before a falling edge of input B, this default is not dispayed by

the diagnostic flag (see open load waveforms).

The device is internally protected against over temperatures by the thermal circuit protection. When the

device junction temperature exceeds the protection limit, S1 is automatically switched off. Therefore the

again. This default is not dispayed by the diagnostic flag.

OVERVOLTAGE

automatically switched off, therefore the device operates in recirculation mode.

FIGURE 1: SWITCHING PARAMETER TEST CONDITIONS

VN380

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