AME, Inc.
AME9002
y
inar
lim
Pre
CCFL Backlight Controller
Figure 3. Idealized Gate Drive Waveforms
Q2 Gate
(OUTA)
V
BATT
V
BATT
- 7.5V
Q3-1 Gate
(OUTAPB)
5V
0V
5V
Q3-2 Gate
(OUTC)
0V
Figure 4.
Power Stage Single Tube Components
(Same component designations used throughout)
Figure 5.
Power Stage Single Tube Components
with parasitic elements
(Same component designations used throughout)
V
BATT
OUTA
D = 0-100%
Vhi = Vbatt
Vlo = Vbatt-7.5V
F = fosc
Q2
T1
V
BATT
OUTA
D = 0-100%
Vhi = Vbatt
Vlo = Vbatt-7.5V
F = fosc
Q2
Lp
OUTAPB
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
Lp
Q3-1
Q3-2
OUTC
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
T1
OUTAPB
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
Q3-1
1:N
Q3-2
OUTC
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
L leak
Signals OUTC
and OUTAPB
are the inverse
of each other.
C
parasitic
CCFL
Signals OUTC
and OUTAPB
are the inverse
of each other.
CCFL
D5
D4
To Control
Circuitry
R9+R10
D5
D4
To Control
Circuitry
R9+R10
11
AKM [ ASAHI KASEI MICROSYSTEMS ]
