SSL1523 datasheet(12/21 Pages) NXP

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UM10406

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User manual

Rev. 01 — 3 August 2010

12 of 21

NXP Semiconductors

UM10406

SSL1523 5 W LED driver

8.1 Winding specification

8.2 Electrical characteristics

• Nominal frequency = 100 kHz

• Vbreakdown N1, N2 = 4 kV and N3, N2 = 4 kV

• Leakage inductance = 20 μH (short N2)

8.3 Core and bobbin

• Core: EE13/6/6 (3C90 or better)

• Air gap in centre leg

• Bobbin: for EE13/6/6 core; bobbin must be suitable for Class II isolation requirements.

8.4 Physical dimensions

Fig 7.

Winding specification

Table 3.

Winding specification

Winding

Section

Ratio

Primary to secondary

N1 : N2

1 : 0.173

Primary to auxiliary

N1 : N3

1 : 0.204

tape

019aaa138

N1 (2-3):

AWG39

bobbin

1 mm on pin 1 - 4 side

N1 (2-3):

AWG39

N2 (7-6):

AWG26 TIW

N3 (1-4):

AWG35

Table 4.

Inductance

Section

Inductance

1.85 m

H ± 5%

μH

Fig 8.

Transformer dimensions

15 mm

18.5 mm

15.75 mm

019aaa139

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