AN4164 datasheet(11/38 Pages) STMICROELECTRONICS

Part #	AN4164

Description	This document describes a 12 V-350 mA power supply set in non-isolated flyback topology

PDF	38 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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AN4164

Transformer

Doc ID 023660 Rev 1

11/38

Transformer

The characteristics of the transformer are listed in the table below.

The following figures show the electrical diagram, size and pin distances (in mm) of the

transformer.

Table 3.

Transformer characteristics

Parameter

Value

Test conditions

Manufacturer

Magnetica

Part number

1921.0040

Primary inductance (pins 3 - 4)

1.2 mH ± 15%

Measured at 1 kHz 0.1 V

Leakage inductance

2.8%

Measured at 10 kHz 0.1 V

Primary to secondary turn ratio (3 - 4)/(5 - 8)

6.11 ± 5%

Measured at 10 kHz 0.1 V

Primary to auxiliary turn ratio (3 - 4)/(2 - 1)

5 ± 5%

Measured at 10 kHz 0.1 V

Figure 5.

Transformer, pin distances

Figure 6.

Transformer, electrical diagram

AM13331v1

AM13332v1

Figure 7.

Transformer side view 1

Figure 8.

Transformer side view 2

AM13333v1

AM13334v1

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