UM10406

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© NXP B.V. 2010. All rights reserved.

User manual

Rev. 01 — 3 August 2010

11 of 21

NXP Semiconductors

UM10406

SSL1523 5 W LED driver

8.

Transformer specification

Figure 6 shows the transformer schematic:

Q10

dual transistor

PNP

BCM857DS

SC-74 (TSOP6)

SOT457

Farnell

1757904

NXP

BCM857DS

Q11

transistor PNP

BC857

SMD

-

-

-

-

R1

resistor

33

Ω 2 W

-

Farnell

1565460

Welwyn

-

R2

resistor

100

Ω

0603

-

-

-

-

R3

resistor

6.8 k

Ω

0603

-

-

-

MC34751

R4

resistor

220 k

Ω

0603

-

-

-

-

R5

resistor

20 k

Ω

0603

-

-

-

-

R6

resistor

47 k

Ω

0603

-

-

-

-

R7

resistor

120 k

Ω

0805

-

-

-

-

R8

resistor not

wirewound

2.4

Ω

1206

-

-

-

-

R9

resistor not

wirewound

2.4

Ω

1206

-

-

-

-

R10

current sense

resistor not

wirewound

1

Ω 1 W 1 %

-

Farnell

5383894

RCD

Components

F1S 1R

R11

resistor

220

Ω 1 %

0603

-

-

-

-

R12

resistor

220

Ω 1 %

0603

-

-

-

-

R13

resistor

1 k

Ω

0603

-

-

-

-

R17

resistor

1 k

Ω 1 %

0603

-

-

-

-

R14

resistor

10 k

Ω 1 %

0603

-

-

-

-

R15

resistor

10 k

Ω 1 %

0603

-

-

-

-

R19

resistor

10 k

Ω

0603

-

-

-

-

R20

resistor

10 k

Ω

0603

-

-

-

-

R16

resistor

6.2 k

Ω 1 %

0603

-

-

-

-

R18

variable resistor 4.7 k

Ω

potentiometer

leaded

Farnell

1227568

Tyco

CB10MV472ME

TX1

transformer

760871038

EE13

Wuerth

760871038 Wuerth

760871038

Table 2.

Fig 6.

Transformer schematic

6

7

2

3

4

1

N1

N3

019aaa137

N2