December 2011

Doc ID 022179 Rev 1

1/19

AN3978

Application note

Designing a digital output module

with the L6370Q intelligent power switch STEVAL-IFP020V1

Introduction

The L6370Q is a single channel high-side driver chip intended for driving resistive, inductive

or capacitive loads in industrial environments. It provides an embedded fast

demagnetization feature for inductive load switch-off. The chip evaluates load disconnection

voltage undervoltage and provides feedback to a control unit. An integrated extensive set of

electrical protections makes the application safe and reliable for use in harsh conditions.

This application note documents an example of an application design with the L6370Q

component. It guides the user on how to choose application external components, provides

appropriate schematic diagrams and PCB design, and an overview of immunity test results.

Application main features

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Galvanic isolated digital output module

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Single channel topology

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2.5 A output current

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100 m

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9.5 V to 35 V supply voltage range

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Output current limiting

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Thermal shutdown

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Open ground protection

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Undervoltage lockout with hysteresis

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Open load detection

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Two diagnostic outputs

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Output status LED indication

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Non-dissipative short-circuit protection

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Protection against surge pulses (IEC61000-4-5)

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Immunity against burst transient (IEC61000-4-4)

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ESD protection (IEC61000-4-2)

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Compact design thanks to small component packages (L6370Q in QFN 7 x 7 mm)

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