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PDF AME9002 Data sheet ( Hoja de datos )
| Número de pieza | AME9002 | |
| Descripción | CCFL Backlight Controller | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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AME, Inc.
AME9002
Preliminary
www.DataSheet4U.com
CCFL Backlight Controller
n General Description
The AME9002 is AME’s next generation direct drive
CCFL controller. Like its cousin, the AME9001, the
AME9002 controller provides a cost efficient means to
drive single or multiple cold cathode fluorescent lamps
(CCFL), driving 3 external MOSFETs that, in turn, drive a
wirewound transformer that is coupled to the CCFL.
However the AME9002 includes extra circuitry that al-
lows for a special one second start up period wherein the
voltage across the CCFL is held at a higher than normal
voltage to allow older tubes (or cold tubes) a period in
which they can “warm up”. During this one second
startup period the driving frequency is adjusted off of reso-
nance so that the tube voltage can be controlled. As
soon as the CCFL “strikes” the special start up period
ends and the circuit operates in its normal mode.
The AME9002 includes features such as soft start, duty
cycle dimming control, dimming control polarity selec-
tion, undervoltage lockout and fault detection. It is de-
signed to work with input voltages from 7V up to 24V.
When disabled the circuit goes into a zero current mode.
n Pin Configuration
24 23 22 21 20 19 18 17 16 15 14 13
AME9002
1 2 3 4 5 6 7 8 9 10 11 12
AME9002
1. VREF
2. CE
3. SSC
4. RDELTA
5. FAULTB
6. RT2
7. VSS
8. OVPH
9. OVPL
10.FCOMP
11.CSDET
12.BATTFB
13. OUTC
14. OUTAPB
15. OUTA
16. VBATT
17. BRPOL
18. VDD
19. CT1
20. FB
21. COMP
22. BRIGHT
23. SSV
24. PNP
n System Block Diagram
n Features
l Small package: 24 pins for QSOP/ SOIC/
PDIP packages
l Drives multiple tubes
l Special 1 second start up mode
l Automatically checks for common fault
conditions
l 7.0V < Vbatt < 24V
l Low component count
l Low Idd < 3.5mA
l <1uA shutdown mode
l Battery UV lockout
l Brightness polarity select
Controller
External
Components
CCFL Array
AME
9002
+
Resistors
+
Capacitors
N
n Applications
l Notebook computers
l LCD/TFT displays
LIGHT
1
1 page  
AME, Inc.
AME9002
Preliminary
www.DataSheet4U.com
CCFL Backlight Controller
n Ordering Information (contd.)
Part Number
AME9002AETH
AME9002AEPH
AME9002AEJH
Marking Output Voltage Package Operating Temp. Range
AME9002AETH
xxxxxxxx
yyww
N/A
QSOP-24
- 40oC to + 85oC
AME9002AEPH
xxxxxxxx
yyww
N/A
PDIP-24
- 40oC to + 85oC
AME9002AEJH
xxxxxxxx
yyww
N/A
SOIC-24
- 40oC to + 85oC
n Absolute Maximum Ratings
Parameter
Maximum
Unit
Battery Voltage (VBATT)
25 V
ESD Classification
B
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
n Recommended Operating Conditions
Parameter
Battery Voltage (VBATT)
Ambient Temperature Range
Junction Temperature
Rating
7 - 24
- 40 to + 85
- 40 to + 125
Unit
V
oC
oC
n Thermal Information
Parameter
Thermal Resistance (QSOP - 24)
Maximum Junction Temperature
Maximum Lead Temperature (10 Sec)
Maximum
325
150
300
Unit
oC / W
oC
oC
5
5 Page 
AME, Inc.
AME9002
Preliminary
www.DataSheet4U.com
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)
VBATT
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
VBATT
VBATT- 7.5V
5V
0V
5V
0V
Figure 5.
Power Stage Single Tube Components
with parasitic elements
(Same component designations used throughout)
VBATT
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.
Cparasitic
CCFL
D5 D4
To Control
Circuitry
R9+R10
D5 D4 To Control
Circuitry
R9+R10
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AME9002.PDF ] | |
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