Rainbow Electronics MAX8759 - Manual (Page 14)

MAX8759
Low-Cost, SMBus, CCFL Backlight Controller
14 ______________________________________________________________________________________
Figure 2. MAX8759 Functional Diagram
MAX8759
LINEAR
REGULATOR
BIAS
4.3V
RDY
EN
SMBus
DWPM
OSC
ALS
ADC
BRIGHTNESS
CONTROL
8-BIT
COUNTER
PWM
ADC
40k Ω
S
R
Q
BATT
V CC
VALS
ISEC
SCL
FREQ
SDA
ALS
PWMI
PWMO
DPWM
LATCH
DPWM
COMP
S
R
Q
V CC
OC
COMP
UVLO
COMPARATOR
BATT
GND
MAX
FW
FW
OV
COMP
OC
OC
1.21V
OPEN-LAMP
COMP
600mV
135 µA
1 µA
Z X
2.3V
VFB
COMP
IFB1
IFB2
1000 µA 100 µA
RDY
ERROR
AMP
V REF
MUX
LX_ ZX
ILIM
COMP
400mV
PWM
COMP
BST1
GH1 DH
DH
DL
DL
LX1
BST2
GH2
LX2
VDD
GL1
PGND2
GL2
GATE-DRIVER
CONTROL
STATE
MACHINE R
TON FF
MIN
TON
S Q
Q
ZERO-CROSS
DETECTIONS
AND
DELAY BLOCK
PGND1
DEL
S
R
Q SHUTDOWN
FAULT
LATCH
230mV
VFB UV
COMP
TFLT
4V MIN