lx1688 Microsemi Corporation, lx1688 Datasheet - Page 6

• Manufacturer Part Number: lx1688
• Description: Multiple Lamp Ccfl Controller
• Manufacturer: Microsemi Corporation

Copyright © 2001
Rev. 1.2, 2006-03-09
Controller
Master
Slave
Mode
TM
Controller
Operation
Striking
Striking
RMP_RST
PHA_SYNC
Fault
Fault
ENABLE
VDDSW
Run
Run
BEPOL
SLAVE
CPW 1
CPW 2
BRITE
* Conventional polarity means that the lamp brightness increases with increasing voltage on the BRITE pin.
Pin BEPOL
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
FLOAT
V
V
1M
DD
SS
+
-
1M
2.5
0.5
V
V
POLARITY
Input Pin:
DECODE
BUF
TTL
OLSNS
> 0.6V
< 0.2V
> 0.6V
< 0.2V
VDD
Q
TFF
Reverse polarity means that brightness decreases with increasing voltage
F
X
X
F
EXT
INT
100K
R
T
200K
+ (HI = CHIP_ON, LOW = CHIP_OFF)
VSS
- (LOW = CHIP_ON, HI = CHIP_OFF)
+ (HI = CHIP_ON, LOW = CHIP_OFF
F
PWR_ GD
EXT
1V
GENERATOR
GENERATOR
S I M P L I F I E D B L O C K D I A G R A M
RAMP RUN
/2
VSS
+
-
100K
STRIKE
PWR_ BD
ENABLE POLARITY
Figure – Simplified Block Diagram
O P E R A T I O N A L M O D E S
Input Pin:
100K
SLAVE
1V
VDD
VDD
VDD
ISNS VSNS
VSS
VSS
VSS
Integrated Products Division
VDD
+
-
100K
300mV
1.25V
®
Microsemi
PWR_BD
ERROR AMP
FAULT
VAMP
BRT
INTERNAL VDD
VCOMP ICOMP
IAMP
T A B L E 1
0-2V
RangeMAX™
Output Pin:
FAULT
I_R
COMPARATOR
H
H
L
L
L
L
VOLTAGE
PWR_ GD
COMPARATOR
FAULT
CURRENT
BIAS GEN
CPOR
UVLO
Multiple Lamp CCFL Controller
STEERING
PWR_ BD
OUTPUT
LOGIC
PWR_GD
PWR_BD
Pin: RMP_RST
P
Q
Output: F
Output: F
Output: F
Q
Input: F
Input: F
Input: F
COUNTER
RODUCTION
IGNITE
6 BIT
DIMMING POLARITY*
CONVENTIONAL
FAULT
EXT
EXT
EXT
REVERSE
REVERSE
INT
INT
INT
TRI WAVE
GEN
D
Output: F
Output: F
Output: F
ATA
Input: F
Input: F
Input: F
TTL
BUF
Pin: A_SYNC
LX1688
800mV
600mV
S
HEET
EXT
EXT
EXT
OLSNS
FAULT
VSS_P
INT
INT
INT
B OUT
TRI_C
A OUT
V
DD_P
/ 2
/ 2
/ 2
/ 2
/ 2
/ 2
Ramping up /
Ramping up /
Frequency
F
LX1688
F
down
down
Lamp
EXT
INT
Off
Off
/ 2
/ 2
Page 6