L6986ITR datasheet(45/60 Pages) STMICROELECTRONICS

45 / 60 page

Reference

Part number

Description

Manufacturer

R17

R18

XAL4030-472MEC

4.7 µH

Coilcraft

MPZ2012S221A

Ferrite bead

TDK

STPS1150AY

Schottky diode, 150 V, 1 A

STM

#1, #2

BZT52B4V3-HE3-08

Zener Diode 4.3 V

Vishay Semiconductor

N/A

2STR1215

NPN power transistor

STM

ZA9668-AE

Transformer, N = 5.8,

3.3 kV isolation

Coilcraft

2106.0007

Transformer, N = 5.6,

1.5 kV isolation

Magnetica

ZB1175-AE

Transformer, N = 1.53, 3.3

kV isolation

Coilcraft

TL431AIL3T

Adjustable voltage reference

STM

8.1

Fine tuning of the evaluation boards

The evaluation boards can be customized to better match the user demands.

If a different dual isolated voltage is necessary (e.g. 15 V / - 6 V), the replacement of two components is

enough to adapt the board: the Zener diode D3 (with a diode providing the most suitable Zener voltage) and

the resistor divider (one of the two resistors) R12 - R13, in accordance with the equation:

VISO+=2.49V⋅R12+R13

R13

(47)

Obviously, the total voltage VISO+ + |VISO-| must be compatible with the available voltage at the

secondarywinding of the transformer.

STEVAL-A6986IV1 and STEVAL-L6986IV1 can be also turned into a single isolated voltage board by

soldering a 0 Ω resistor in place of the capacitor C12.

Any of the above-mentioned fine tunings could require an adjustment of the resistor R11.

L6986I

Fine tuning of the evaluation boards

DS13647 - Rev 1

page 45/60

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