MAX8722 Maxim Integrated Products, MAX8722 Datasheet - Page 11
MAX8722
Manufacturer Part Number
MAX8722
Description
Low-Cost CCFL Backlight Controller
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8722.pdf
(20 pages)
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Figure 2. MAX8722 Functional Diagram
DPWM
COMP
SYNC
FREQ
CNTL
BATT
ISEC
TFLT
GND
VFB
V
IFB
CC
2.3V
H.W. RECT
F.W. RECT
OVERVOLTAGE
COMPARATOR
600mV
1.25V
______________________________________________________________________________________
CURRENT
DPWM OSCILLATOR
OVER-
CONTROL LOGIC
AND DIMMING
100µA
OVERCURRENT
COMPARATOR
OPEN-LAMP
COMPARATOR
SECONDARY
Low-Cost CCFL Backlight Controller
800mV
CURRENT
OVER-
REGULATOR
LINEAR
400µA
AMPLIFIER
RAMP
ERROR
FAULT DELAY
BLOCK
SUPPLY
4.2V
BIAS
PWM
COMPARATOR
EN
SHDN
UVLO
COMPARATOR
UVLO
PWM CONTROL
OVERCURRENT
AND ZERO-
CROSSING
PRIMARY
LOGIC
RESET
UVLO
FLT
R
S
LATCH
FAULT
Q
GATE-DRIVER
CONTROL
MACHINE
STATE
MUX
FLT
MAX8722
SHDN
BST1
GH1
LX1
BST2
GH2
LX2
V
GL1
PGND
GL2
ILIM
DD
11
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