Sony HDVF-C30W Maintenance Manual page 47

LT1768CGNTR-100 (LINEAR TECH)
HIGH POWER CCFL CONTROLLER
—TOP VIEW—
PGND 1 16 GATE
OUT
DIO1 2 15 V
I/O IN IN
DIO2 3 14 V
I/O REF OUT
FAULT
SENSE 4 13
IN OUT
SHDN
VC 5 12
IN IN
AGND 6 11 R
MIN OUT
CT 7 10 R
IN MAX OUT
PROG 8 9 PWM
IN IN
15
V V
IN REF
UNDERVOLTAGE LOCKOUT
12
THERMAL SHUTDOWN
SHDN
14
V REF
11
R
MIN 1.26 V I R
MIN
10
I R MAX
R MAX
1.25 V
0
1 V 4 V
MODE CONTROL
8
PROG I VC
V
CCLAMP
FAULT
9 V
PWM
PWM
MULTI-MODE
1 V
7
CT
PWM PERIOD
DIMMING BLOCK
HDVF-C30W
INPUTS
CT : DETERMINE THE PWM MODULATION
FREQUENCY
PROG : CONTROL THE LAMP CURRENT
PWM : CONTROL THE PERCENTAGE OF THE
PROG RANGE
SENSE : CURRENT SENSE COMPARATOR
SHDN
: CONTROL THE OPERATION OF THE LT1768
VC : SUMMING JUNCTION
V : VOLTAGE SUPPLY
IN
OUTPUTS
FAULT
: OPEN COLLECTOR
GATE : NPN HIGH CURRENT STAGE
R : REGULATED VOLTAGE OF 1.25 V
MAX
R : REGULATED VOLTAGE OF 1.26 V
MIN
V : REGULATED 5 V
REF
INPUTS/OUTPUTS
DIO1, DIO2 : COMMON CONNECTION
OTHERS
AGND : ANALOG GROUND
PGND : HIGH CURRENT GROUND PATH
OSC
SLOPE
(ICIO1 + ICIO2)
GAIN
I
VC
5 2
VC DIO1 DIO2
16
GATE
V GATE
IN
SW BLANK
S
Q
R
4
SENSE
ICIO1 < 125uA
13
FAULT
ICIO2 < 125uA
3
IC
3-3