AN3011 datasheet(8/37 Pages) STMICROELECTRONICS

8 / 37 page

Board descriptions

AN3011

8/37

Doc ID 16043 Rev 1

1.3

Transformer

Transformer characteristics are listed in Table 3:

Figure 3

, 4, 5, and 6 show the size and pin distances (inches and [mm]) of the transformer.

R16, R17

2.7 Meg 1% precision resistor

R18

47 k

Ω 1% precision resistor

R19

220

Switch mode transformer

WE - 750871012

Würth Elektronik

Common mode line filter

BU15-4530R4BL

Coilcraft

Offline switching regulator

VIPER27HN

STMicroelectronics

VR1

Voltage reference

TS431

STMicroelectronics

Table 2.

BOM (continued)

Part

reference

Description

Part name

Manufacturer

Table 3.

Transformer characteristics

Properties

Value

Test condition

Manufacturer

Würth Elektronik

Part number

750871012

Primary inductance

900 µH ±10 %

Measured at 10 kHz 0.1 V

Leakage inductance

25 µH max

Measured at 100 kHz 0.1 V (primary

and secondary windings shorted)

Primary to secondary turn ratio

(4 - 5) / (6, 7 – 8, 9)

14.75 ±1 %

Measured at 10 kHz 0.1 V

Primary to auxiliary turn ratio (6 - 4) /

(3 - 1)

5.36 ±1 %

Measured at 10 kHz 0.1 V

Insulation

4 kV

Primary to secondary

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