VN380SP Просмотр технического описания (PDF) - STMicroelectronics

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VN380SP

Smart solenoid driver solid state relay

STMicroelectronics 

VN380SP

3

Functional description

Functional description

3.1

Current cut off

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). S1 is latched off until A goes low

and high again.

This default is not displayed by diagnostic flag.

3.2

Open-load

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 on Figure 5).

3.3

Thermal shutdown

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 device operates in recirculation mode (S2 active).

S1 remain latched off until Vpwr1 goes low and high again. This default is not dispayed by the

diagnostic flag.

3.4

Overvoltage

During the on-state of S1 switch, if Vpwr1 or Vpwr2 is rising above the threshold detection S1

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

Figure 4. Switching parameter test conditions

Doc ID 15602 Rev 2

7/12

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