L6567 STMicroelectronics, L6567 Datasheet - Page 12

• Manufacturer Part Number: L6567
• Description: HIGH VOLTAGE DRIVER FOR CFL
• Manufacturer: STMicroelectronics

L6567
Figure 11. Frequency vs I
Figure 12. F
12/15
80.00
60.00
40.00
20.00
1 00 .0 0
80 .0 0
60 .0 0
40 .0 0
20 .0 0
0 .0 0
0.20
R ref= 20 K
R ref= 22 K
Rr ef= 24 K
R r ef= 33K
R re f= 27K
R re f= 30K
Rr ef= 36 K
R r ef= 39K
Rr ef=4 3 K, 47K , 51 K
MIN
20 .0 0
0.40
: measurements and calculations
0.60
30 .0 0
R re f [K o hm ]
Ir h v [m A ]
Fm in= 1/(8 *C f*R ref)
m eas ura m ents
RHV
0.80
@ C
4 0 .0 0
F
= 150pF
1.00
C f=15 0pF
C f=120pF
C f= 82pF
C f=100p F
50 .0 0
1.20
Figure 13. F
1 2 0 0 0 0 . 0 0
1 1 0 0 0 0 . 0 0
1 0 0 0 0 0 . 0 0
9 0 0 0 0 . 0 0
8 0 0 0 0 . 0 0
7 0 0 0 0 . 0 0
6 0 0 0 0 . 0 0
5 0 0 0 0 . 0 0
4 0 0 0 0 . 0 0
3 0 0 0 0 . 0 0
2 0 0 0 0 . 0 0
1 0 0 0 0 . 0 0
0 . 0 0
0. 4 0
c a lc u latio ns ( 1/12 1 )*Ir hv /C f
m eas u re m en ts
calculations
FEED FORWARD
0 .6 0
Irh v [ m A ]
0 .8 0
: measurements and
1 . 00
Cf= 8 2pF
Cf= 1 00p F
C f= 12 0 pF
Cf= 1 50p F
1 .2 0