AN3978 Datasheet, PDF (1/19 Pages) STMicroelectronics – Designing a digital output module

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
(in channel ON state), output short connection to V_CC or GND, overtemperature, supply
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
● Galvanic isolated digital output module
● Single channel topology
● 2.5 A output current
● 100 mΩ output MOSFET R_DSON
● 9.5 V to 35 V supply voltage range
● Output current limiting
● Thermal shutdown
● Open ground protection
● Internal negative voltage clamping to V_S - 50 V for fast demagnetization
● Undervoltage lockout with hysteresis
● Open load detection
● Two diagnostic outputs
● Output status LED indication
● Non-dissipative short-circuit protection
● Protection against surge pulses (IEC61000-4-5)
● Immunity against burst transient (IEC61000-4-4)
● ESD protection (IEC61000-4-2)
● Compact design thanks to small component packages (L6370Q in QFN 7 x 7 mm)
December 2011
Doc ID 022179 Rev 1
1/19
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