AN3286 datasheet(9/42 Pages) STMICROELECTRONICS

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AN3286

Adapter features

Doc ID 17998 Rev 1

9/42

1.2

Transformer

The transformer’s electrical characteristics are listed in Table 3.

RH2

1.1 M

1/4 W resistor

12 k

1/4 W resistor

VR1

TS431

Voltage reference

STMicroelectronics

OPTO1

PC817

Optocoupler

1338.0019

Transformer

Magnetica®

4530R4B

Common mode choke

TDK

2.2 µH

RFB0807-2R2L

Coilcraft

3-pin jumper

VIPer25

PWM controller

STMicroelectronics

Table 2.

Bill of material (continued)

Reference

Part

Description

Manufacturer

Table 3.

1338.0019 transformer characteristics

Properties

Value

Test condition

Primary inductance

1.5 mH ±15%

Measured at 1 kHz

Leakage inductance

0.8% nom.

Measured at 10 kHz

Primary to secondary turn ratio (4 - 5)/(6, 7 - 10, 9)

12.85 ±5%

Measured at 10 kHz

Primary to auxiliary turn ratio (4 - 5)/(1 - 2)

5.29 ±5%

Measured at 10 kHz

Nominal operating frequency

60 kHz

VIPer25 demonstration board

Nominal/peak power

10 W/15 W

Saturation current

1 A

BSAT = 0.32T

Insulation

4 kV

Primary to secondary

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