VNI4140K quad high-side smart power solid-state relay IC description

AN2684

6/21

Doc ID 14266 Rev 1

3

VNI4140K quad high-side smart power solid-state

relay IC description

The VNI4140k is a monolithic 4-channel driver featuring a very low supply current. The IC,

which uses STMicroelectronics VIPower technology, is intended for driving loads with one

side connected to ground.

Active channel current limitation, combined with thermal shutdown (independent for each

channel) and automatic restart, protect the device against overload.

The main features of the VNI4140K IC are:

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Output current: 0.7 A per channel

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Shorted load protections for each channel

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Junction overtemperature protection

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Case overtemperature protection for thermal independence of the channels

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Thermal case shutdown and restart not simultaneous for the various channels

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Protection against ground disconnection

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Current limitation

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Undervoltage shutdown

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Open drain diagnostic outputs

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3.3 V CMOS/TTL compatible inputs

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Fast demagnetization of inductive loads

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Conforms to IEC 61131-2

Figure 2.

Block diagram

Active current limitation avoids that the system power supply drops in case of shorted load.

In overload condition, the channel turns OFF and back ON automatically after the IC

temperatures decrease below a threshold fixed by a temperature hysteresis so that junction