MAX8722 Maxim Integrated Products, MAX8722 Datasheet - Page 10

• Manufacturer Part Number: MAX8722
• Description: Low-Cost CCFL Backlight Controller
• Manufacturer: Maxim Integrated Products

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Low-Cost CCFL Backlight Controller
Figure 1. Typical Operating Circuit of the MAX8722
10
PIN
18
19
20
21
22
23
24
BRIGHTNESS
______________________________________________________________________________________
ON/OFF
DPWM
SYNC
GND
V
IN
V
CC
NAME
PGND
GND
GH1
GL1
GL2
V
V
DD
CC
100kΩ
F1
0.47µF
0.1µF
200kΩ
169kΩ
R4
2A
C8
C9
1%
R5
R6
High-Side MOSFET NH1 Gate-Driver Output
Low-Side MOSFET NL1 Gate-Driver Output
Low-Side MOSFET NL2 Gate-Driver Output
Power Ground. PGND is the return for the GL1 and GL2 gate drivers.
Low-Side Gate-Driver Supply Input. Connect V
V
5.3V/10mA Internal Linear-Regulator Output. V
1µF ceramic capacitor to GND.
Analog Ground. The ground return for V
the IC at the IC’s backside exposed metal pad.
DD
with a 0.1µF capacitor to PGND.
BATT
GND
V
ILIM
FREQ
SHDN
CNTL
SYNC
DPWM
CC
MAX8722
COMP
PGND
BST2
BST1
ISEC
TFLT
GH1
GH2
V
LX1
LX2
GL1
GL2
VFB
IFB
DD
0.1µF
C5
0.1µF
C11
0.22µF
D1
C6
CC
V
CC
, REF, and other analog circuitry. Connect GND to PGND under
C10
0.01µF
CC
DD
FUNCTION
is the supply voltage for the device. Bypass V
to the output of the internal linear regulator (V
C7
0.47µF
NH1
NL1
Pin Description (continued)
NH2
NL2
C1
4.7µF
25V
1µF
C2
40.2Ω
1%
R3
T1
C3
18pF
3kV
C4
15nF
CCFL
CC
CC
150Ω
1%
). Bypass
R1
with a