LX1688C Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1688C Datasheet PDF : 16 Pages
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RangeMAX™
LX1688
TM
®
Multiple Lamp CCFL Controller
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD_P, VDD)................................................................................ 6.5V
Digital Inputs ................................................................................... -0.3V to VDD +0.5V
Analog Inputs.................................................................................. –0.1V to VDD +0.5V
Digital Outputs................................................................................. -0.3V to VDD +0.5V
Analog Outputs ................................................................................ -0.1V to VDD +0.5V
Maximum Operating Junction Temperature ............................................................150°C
Storage Temperature................................................................................. -65°C to 150°C
Peak Package Solder Reflow Temp. (40 seconds max. exposure) ................260°C(+0.-5)
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.
THERMAL DATA
PW Plastic TSSOP 24-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
100°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the
above assume no ambient airflow.
PACKAGE PIN OUT
AOUT
VSS_P
VSS
BEPOL
BRITE
CPOR
ENABLE
I_R
CPWM1
CPWM2
RMP_RST
PHA_SYNC
1
24
2
23
3
22
4
21
5
20
6
19
7
18
8
17
9
16
10
15
11
14
12
13
PW PACKAGE
(Top View)
BOUT
VDD_P
VDD
VDDSW
TRI_C
OLSNS
ISNS
ICOMP
VCOMP
VSNS
SLAVE
FAULT
RoHS / Pb-free 100% matte Tin Lead Finish
Pin Name
AOUT
VSS_P
VSS
BEPOL
BRITE
CPOR
ENABLE
I_R
CPWM1
CPWM2
RMP_RST
PHA_SYNC
FUNCTIONAL PIN DESCRIPTION
Description
Pin Name
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 CPOR to VDD and
is used for setting power-up reset pulse width.
Used to enable or disable the chip
Connects to external resistor RI; for bias current
setting for internal oscillator
BOUT
VDD_P
VDD
VDDSW
TRI_C
OLSNS
ISNS
ICOMP
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 CTRI
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 CICOMP
Connects to external capacitor CPWM, used for
integrating an external digital PWM signal for
analog dimming
VCOMP
Voltage error Amp’s output; connects to external
capacitor CVCOMP, can be used for soft-start
Connects to external capacitor CPWM, used for
integrating an external digital PWM signal for
analog dimming.
VSNS
Analog input from transformer output voltage
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
SLAVE
Input control pin for setting the IC either in Master
or Slave mode; “1” for slave mode and “0” for
master mode.
If SLAVE= “0”, PHA_SYNC is a CMOS output; if
SLAVE = “1”, it is a CMOS input that make the
AOUT/BOUT phase synchronous with the master
FAULT
Digital output to indicate maximum number of lamp
striking attempts has occurred without lamp
ignition.
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 2
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