LX1688 Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1688 Datasheet PDF : 16 Pages
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RangeMAX™
LX1688
TM
®
Multiple Lamp CCFL Controller
PRODUCTION DATA SHEET
TABLE 1
Pin BEPOL
ENABLE POLARITY
DIMMING POLARITY*
VDD
FLOAT
+ (HI = CHIP_ON, LOW = CHIP_OFF
+ (HI = CHIP_ON, LOW = CHIP_OFF)
CONVENTIONAL
REVERSE
VSS
- (LOW = CHIP_ON, HI = CHIP_OFF)
REVERSE
* Conventional polarity means that the lamp brightness increases with increasing voltage on the BRITE pin.
Reverse polarity means that brightness decreases with increasing voltage
Controller
Mode
Master
Slave
Controller
Operation
Run
Striking
Fault
Run
Striking
Fault
Input Pin:
OLSNS
> 0.6V
< 0.2V
X
> 0.6V
< 0.2V
X
OPERATIONAL MODES
Input Pin:
SLAVE
VSS
VSS
VSS
VDD
VDD
VDD
Output Pin:
FAULT
L
L
H
L
L
H
Pin: RMP_RST
Output: FINT
Output: FINT
Output: FINT
Input: FEXT
Input: FEXT
Input: FEXT
Pin: A_SYNC
Output: FINT / 2
Output: FINT / 2
Output: FINT / 2
Input: FEXT / 2
Input: FEXT / 2
Input: FEXT / 2
Lamp
Frequency
FINT / 2
Ramping up /
down
Off
FEXT / 2
Ramping up /
down
Off
SIMPLIFIED BLOCK DIAGRAM
PHA_SYNC
SLAVE
RMP_RST
BRITE
CPW 1
CPW 2
BEPOL
ENABLE
VDDSW
ISNS VSNS VCOMP ICOMP
2.5
+V
-
0.5
V
FEXT/2
TFF R PWR_ GD
Q
T
FINT
PWR_ BD
RAMP RUN
GENERATOR
ERROR AMP
1.25V
VAMP
PWR_BD
FAULT
FEXT
STRIKE
GENERATOR
300mV
IAMP
1V +
200K
-
100K
100K
1V +
-
100K
100K
BRT
0-2V
1M
VDD
POLARITY
1M
DECODE
TTL
BUF
INTERNAL VDD
VOLTAGE
COMPARATOR
PWR_ GD
FAULT
Q
OUTPUT
STEERING
LOGIC
Q
CURRENT
COMPARATOR
IGNITE
800mV
600mV
6 BIT
PWR_ BD COUNTER
TRI WAVE
GEN
BIAS GEN
UVLO
PWR_GD
PWR_BD
FAULT
TTL
BUF
VDD_P
A OUT
B OUT
VSS_P
OLSNS
TRI_C
FAULT
VSS
VSS
VDD
I_R
CPOR
Figure – Simplified Block Diagram
LX1688
Copyright © 2001
Rev. 1.2, 2006-03-09
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
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