L6569 L6569A

6/13

DEMO BOARD

To allow an easy evaluation of the device, a P.C. board dedicated to lamp ballast application has been de-

signed.

Fig.11 shows the electrical schematic of a typical ballast application, while the PC and component layout is giv-

en in Fig12. This application has been designed to work with both the 110+/-20%V and the 220 +/- 20%V mains

by means of a voltage doubler configuration at the bulk capacitor. The ballast inductance and the operating fre-

quency are especially designed for a 18 W Sylvania De-luxe T/E type bulb. The PTC for preheat at the start up

and the two back to back synchronization diodes, makes this application easy to implement and safe in opera-

tion.

part

value

R1

15ohm 1W

R2, R3

22 ohm

R4

27K

R5

100K 1/2W

R6

47ohm

R7, R9

180K

R8

120K 1/2W

D1

18V zener

D2, D3

BYW100-100

D4,D5,D6,D7

1N4007

D8

1N4148

C1

560pF 50V

C2, C5

47

µF 250V

C3

4.7

µF 25V

C4

100nF 50V

C6

100nF 250V

C7-C8

8.2nF 630V

C9

470pF 630V

RV1

PTC 150ohm

Q1, Q2

STD2NB50-1

L1

2.4mH