RangeMAX™
I N T E G R A T E D
P R O D U C T S
LX1688
M
ULTIPLE
L
AMP
CCFL C
ONTROLLER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD_P, VDD) ....................................................................... 6.5V
Digital Inputs ..............................................................................-0.3V to V
DD
+0.5V
Analog Inputs ............................................................................–0.1V to V
DD
+0.5V
Digital Outputs .......................................................................... -0.3V to V
DD
+0.5V
Analog Outputs ......................................................................... -0.1V to V
DD
+0.5V
Operating Junction Temperature ..................................................................125°C
Storage Temperature ....................................................................................150°C
Lead Temperature (Soldering, 10 Seconds) .................................................300°C
PACKAGE PIN OUT
A
OUT
VSS_P
VSS
BEPOL
BRITE
CPOR
ENABLE
I_R
CPWM1
CPWM2
RMP_RST
PHA_SYNC
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
WWW .
Microsemi
.C
OM
B
OUT
VDD_P
VDD
VDDSW
TRI_C
OLSNS
ISNS
ICOMP
VCOMP
VSNS
SLAVE
FAULT
Note 1: Exceeding these ratings could cause damage to the device. All voltages are with
respect to Ground. Currents are positive into, negative out of the specified terminal.
PWP
ACKAGE
(Top View)
THERMAL DATA
PW
Plastic TSSOP 24-Pin
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
θ
JA
100°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JC
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
Pin Name
A
OUT
VSS_P
VSS
BEPOL
BRITE
CPOR
ENABLE
I_R
CPWM1
CPWM2
Description
Output Driver A
Connects to dedicated GND for Aout and
Bout Drivers
Connects to analog GND
Tri-mode input pin to control the polarity of
the ENABLE and BRITE signal
Analog/PWM input for brightness control
Connects an external capacitor C
POR
to
VDD and is used for setting power-up reset
pulse width.
Used to enable or disable the chip
Connects to external resistor R
I
; for bias
current setting for internal oscillator
Connects to external capacitor C
PWM
, used
for integrating an external digital PWM
signal for analog dimming
Connects to external capacitor C
PWM
, used
for integrating an external digital PWM
signal for analog dimming.
If SLAVE = “0”, RMP_RST is a CMOS
output; if SLAVE = “1”, it is a CMOS input
that locks the ramp oscillation frequency to
the master clock
If SLAVE= “0”, PHA_SYNC is a CMOS
output; if SLAVE = “1”, it is a CMOS input
that
make
the
A
OUT
/B
OUT
phase
synchronous with the master
Pin Name
B
OUT
VDD_P
VDD
VDDSW
TRI_C
OLSNS
ISNS
ICOMP
VCOMP
VSNS
Description
Output Driver B
Connects to dedicated VDD for Aout and
Bout Drivers
Connects to analog VDD
Switchable VDD output controlled by
ENABLE
Connects to external capacitor C
TRI
Analog input to detect open-lamp condition
Analog input from lamp current, has built-in
300mv offset
Current error Amp’s output; connects to
external capacitor C
ICOMP
Voltage error Amp’s output; connects to
external capacitor C
VCOMP
, can be used for
soft-start
Analog input
voltage
from
transformer
output
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
RMP_RST
SLAVE
Input control pin for setting the IC either in
Master or Slave mode; “1” for slave mode
and “0” for master mode.
Digital output to indicate maximum number
of lamp striking attempts has occurred
without lamp ignition.
PHA_SYNC
FAULT
Copyright
2001
Rev. 1.1a, 2003-03-21
Microsemi
Integrated Products, Power Management
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
MICROSEMI [ MICROSEMI CORPORATION ]
