AME9002 Datasheet, PDF (31/37 Pages) Asahi Kasei Microsystems – CCFL Backlight Controller

AME, Inc.
AME9002
Preliminary
CCFL Backlight Controller
Figure 19. Double CCFL Power Section
OUTA
V_Batt
Q2
T1
OUTB
Q3-1
OUTC
Q3-2
OVPL/OVPH
R37
R35 _OVPL/OVPH
R38
R36
C8
(B)
R9B
D5
D4 R7
(C)
R10
(A)
D22 D23
D21 D20 _R9A
R42
R43
FB
EA1
2.5V
CSDET
1.25V
VDD
R40
C34
Outside Chip
COMP
Inside Chip
To PWM Comparator
To Fault Logic
Figure 20. Double transformer construction detail
Low voltages
Secondary
Primaries
Secondary
Large Positive
(Negative) Voltage
Low voltages in
the center
Large Negative
(Positive) Voltage
Common Core
31