AME9002 Datasheet, PDF (11/37 Pages) Asahi Kasei Microsystems – CCFL Backlight Controller

AME, Inc.
AME9002
Preliminary
CCFL Backlight Controller
Figure 3. Idealized Gate Drive Waveforms
Q2 Gate
(OUTA)
Q3-1 Gate
(OUTAPB)
Q3-2 Gate
(OUTC)
Figure 4.
Power Stage Single Tube Components
(Same component designations used throughout)
V_BATT
OUTA
D = 0-100%
Vhi = Vbatt
Vlo = Vbatt-7.5V
F = fosc
OUTAPB
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
Q3-1
Q2
T1
Q3-2
OUTC
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
V_BATT
V_BATT- 7.5V
5V
0V
5V
0V
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
Lp
Q2
Lp
OUTAPB
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
Q3-1
T1
1:N ^Q3-2
L _leak
OUTC
D=50%
Vhi = 5V
Vlo = 0V
F = fosc/2
Signals OUTC
and OUTAPB
are the inverse
of each other.
CCFL
Signals OUTC
and OUTAPB
are the inverse
of each other.
C_parasitic
CCFL
D5
D4
To Control
Circuitry
R9+R10
D5
D4
To Control
Circuitry
R9+R10
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