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LX1688IPW-TR Datasheet(PDF) 6 Page - Microsemi Corporation

Part # LX1688IPW-TR
Description  Multiple Lamp CCFL Controller
Download  16 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

LX1688IPW-TR Datasheet(HTML) 6 Page - Microsemi Corporation

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


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