AN1842 datasheet(14/17 Pages) STMICROELECTRONICS

14 / 17 page

AN1842 APPLICATION NOTE

14/17

References

[1] "L5991 Data Sheet"

[2] "AN1537: A simple trick enhances L5991's standby function"

ANNEX1: Transformer spec

Transformer General Description

APPLICATION TYPE:

Consumer, Home Appliance

TRANSFORMER TYPE:

Open, Varnished only

WINDING TYPE

Slot

COIL FORMER:

Vertical type, 7+7 pins

MAX. TEMP. RISE:

45°C

MAX. OPERATING AMB. TEMP. : 60°C

MAINS INSULATION:

ACC. WITH EN60065 - EN60950

Electrical Characteristics

CORE TYPE/GRADE:

ETD34 - 3C90 or equivalent

PRIMARY INDUCTANCE:

825

µH ±10% @1KHz - 0.25V

LEAKAGE INDUCTANCE:

µH MAX @ 10KHz - 0.25V

[1]

PEAK PRIMARY CURRENT:

2 Apk

[1]: Measured between pins 3-7 with all secondary shorted

PROVIDED BY PULSE-ELDOR

P/N: 2074.5056C

Figure 27. Electrical Diagram

PRIM.

AUX

+5V

PRIMARY

SECONDARY

PINS:

DC OUTPUT

VOLTAGE:

RMS

CURRENT:

NUMBER OF

TURNS:

7-3

PRIMARY

0.84 ARMS

2/4-6/8

2.6 ARMS

12-10

12V

5.3 ARMS

11-13

15V (AUX)

0.05 ARMS

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