Datasheet

MAX1997/MAX1998
Quintuple/Triple-Output TFT LCD Power Supplies
with Fault Protection and VCOM Buffer
14 ______________________________________________________________________________________
Figure 2. System Functional Diagram
UVLO AND GATE
CONTROL
FBN
DRVN
FBP
DRVP
FB
LX
GATE
OCN
OCP
OVERCURRENT
COMPARATOR
PGND
ONDCON2 INSHDNONPONN
DRVA
CT
OC
REF
PFLT FREQ
DRV1
FB1
DRV2
FB2
V
C
V
C
V
P
V
G_ON
V
LOGIC
V
SOURCE
V
SOURCE
V
MAIN
V
MAIN
V
P
V
IN
VCOM
BUFFER
GND
VDDB
FBPB
FBNB
OUTB
N
V
VCOM
V
GAMMA
V
G_OFF
MAX1997/MAX1998
MAX1997 ONLY
REF, OSC, AND BIAS
SEQUENCE
CONTROL
REG 1
WITH SOFT-START
AND FAULT
COMPARATOR
REG 2
WITH SOFT-START
AND FAULT
COMPARATOR
REG N
WITH SOFT-START
AND FAULT
COMPARATOR
REG P
WITH SOFT-START
AND FAULT
COMPARATOR
MAIN STEP-UP
REGULATOR
WITH SOFT-START
AND FAULT
COMPARATOR
CONTROL
BLOCK
CONTROL INPUTS
N.C. N.C.