Features

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AEC-Q100 qualified

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Operating temperature range: -40 °C to 135 °C for Tj

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Designed for iso-buck topology

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4 to 38 V operating input voltage

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Primary output voltage regulation

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No optocoupler required

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1.9 A typical sink peak primary current capability

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Peak current mode architecture in forced PWM operation

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300 ns blanking time

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8 µA IQ-SHTDWN

•

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Embedded primary output voltage supervisor

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Adjustable soft-start time

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Internal primary current limiting

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Overvoltage protection

•

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Thermal shutdown

Description

The STEVAL-A6986IV2 evaluation board is based on ST A6986I automotive 38 V, 5

W synchronous iso-buck converter for isolated applications.

The primary output voltage can be accurately adjusted, whereas the isolated

secondary output is generated by a transformer. No optocoupler is required.

The primary sink capability (typ. 1.9 A) allows a proper energy transfer to the

secondary side and enables a tracked soft-start of the secondary output.

The control loop is based on a peak current mode architecture and the device

operates in forced PWM.

The 300ns blanking time filters oscillations generated by the transformer leakage

inductance and makes the solution more robust.

Current sensing on both power elements implements an effective constant current

protection on the primary side. Due to the primary reverse current limit, the

secondary output is protected against short-circuit events. The secondary voltage

is stabilized over current by using a power transistor and a shunt voltage reference

(TL431).

The STEVAL-A6986IV2 evaluation board generates an isolated voltage (around 5

V, easily adjustable), especially suitable for applications requiring a single isolated

supply.

Product summary

38 V, 5 W synchronous

iso-buck converter

evaluation board with

single isolated output

based on the A6986I

STEVAL-

A6986IV2

Automotive 38 V, 5 W

synchronous iso-buck

converter for isolated

applications

A6986I

Automotive 150 V, 1 A

power Schottky rectifier

STPS1150AY

Adjustable micropower

shunt voltage reference

TL431

Applications

In-Vehicle

Infotainment

38 V, 5 W synchronous iso-buck converter evaluation board with single isolated

output based on the A6986I

STEVAL-A6986IV2

Data brief

DB4367 - Rev 1 - March 2021

For further information contact your local STMicroelectronics sales office.

www.st.com