3 Transformer Electrical Specifications

AN2173 - APPLICATION NOTE

10/15

3

Transformer Electrical Specifications

When the VIPer12A (U4) is ON, energy is stored in the primary winding of transformer (10-8),

TR1. This energy is transferred to the auxiliary winding (5-6), and to the output (1-2) when the

VIPer12A is OFF. The auxiliary winding provides the bias voltage for the VIPer12A at pin 4

Figure 10. Transformer Winding Schematic

Table 1.

Winding Inductance Ratings

Parameter

Value

Units

3.25 ± 10%

mH

34 (typ)

µH

N1

N2

12V @ 0.50A

N4

N3

15V @ 0.02A

1

2

8

9

6

10

5

120 - 400V

@ 60kHz,

50% DC

1/2 Primary

1/2 Primary

Secondary

Auxiliary

AI11837

TR1