L6569 L6569A
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
R1
R2, R3
R4
R5
R6
R7, R9
R8
D1
D2, D3
D4,D5,D6,D7
D8
C1
C2, C5
C3
C4
C6
C7-C8
C9
RV1
Q1, Q2
L1
15ohm 1W
22 ohm
27K
100K 1/2W
47ohm
180K
120K 1/2W
18V zener
BYW100-100
1N4007
1N4148
560pF 50V
47µF 250V
4.7µF 25V
100nF 50V
100nF 250V
8.2nF 630V
470pF 630V
PTC 150ohm
STD2NB50-1
2.4mH
value
6/13
STMICROELECTRONICS [ STMICROELECTRONICS ]
