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  Microsemi Electronic Components Datasheet  

LX1695 Datasheet

Switched Royer CCFL Inverter Monitor IC

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TM
LX1695
® Switched Royer CCFL Inverter Monitor IC
PRODUCTION DATA SHEET
DESCRIPTION
The LX1695 is a general purpose The DIM_FREQ pin can also accept
DC to PWM generator with an external clock signal to program
supervisory functions for switched and/or synchronize the Royer output
Royer CCFL inverter modules used in frequency.
single or multiple lamp desktop This low cost eight pin IC includes
monitors and LCD TV sets. It under-voltage lockout and a logical
integrates a PWM that generates ENABLE input that permits shutting
digital (burst mode) dimming from a down the Royer inverter(s) remotely
DC brightness control input, and a without removing their power. A single
protection circuit that shuts off the output pin can be expanded with
Royer oscillator if lamp ignition does external transistors to drive any number
not occur in a timely manner, or in the of Royer circuits, giving a single device
event of one or more open lamps. the ability to control very large displays
Strike and initial open lamp timeout is for LCD TV applications or single lamp
user programmable with an external panels in notebooks and web tablets.
RC, and PWM frequency is The device is available in either an 8
programmable with a single external pin plastic DIP or SOIC package.
resistor.
IMPORTANT: For the most current data, consult MICROSEMI’s website:
PRODUCT HIGHLIGHT
KEY FEATURES
ƒ Single Resistor Programs
Output Frequency
ƒ Allows External Synchronized
PWM
ƒ Open Lamp Sense Protection
ƒ Programmable Fault Delay
ƒ Enable and UV Lockout
ƒ Preset 3.125% Minimum
Output Duty Cycle
APPLICATIONS/BENEFITS
ƒ DC to PWM Generator
ƒ Single or Multi Lamp Designs
ƒ Desktop Monitors
ƒ LCD TV
ƒ Industrial Displays
External CLK Override
allows Syncronization
30 to 600 Hertz x 512
OPTIONAL
ENABLE
Logic High Enable
BRITE_IN
Duty Cycle Control
0 to 2V = 3% to 100%
Wide Range Dimming For a Fixed Royer Inverter
Single Resistor sets
Programmable Clock Frequency
DIM_FREQ OLSNS
ENABLE
GND
LX1695
FLT_DLY ROYER
BRITE_IN
VDD
Open Lamp Detection Input
Gated for Royer High
Royer Bias Drive 30 to 600 Hertz
Royer Inverter
VDD
Fixed Input
Supply 4.5 to 5.5V
Programmable lamp
strike interval at
power on or enable
Copyright © 2004
Rev. 1.0a, 2006-01-06
TJ (°C)
-40 to 85
PACKAGE ORDER INFO
Plastic DIP
M 8-Pin
RoHS / Pb-free
Plastic SOIC
DM 8-Pin
RoHS / Pb-free
LX1695IM
LX1695IDM
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e.
LX1695IDM-TR)
RoHS compliant.
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1


  Microsemi Electronic Components Datasheet  

LX1695 Datasheet

Switched Royer CCFL Inverter Monitor IC

No Preview Available !

LX1695
TM ® Switched Royer CCFL Inverter Monitor IC
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VDD) ........................................................................................6V
Inputs (BRITE_IN, OLSNS, FLT_DLY, ENABLE, DIM_FREQ)................. VDD
Output Current (ROYER) ...........................................................................150mA
RoHS / Pb-free Peak Package Solder Reflow Temperature
(40 seconds Maximum Exposure) .....................................................................................260°C (+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
M Plastic 8-Pin DIP
THERMAL RESISTANCE-JUNCTION AMBIENT, θJA
85°C/W
DM Plastic 8-Pin SOIC
THERMAL RESISTANCE-JUNCTION AMBIENT, θJA
163°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
DIM_FREQ
ENABLE
FLT_DLY
BRITE_IN
18
27
36
45
DM Package
(Top View)
OLSNS
GND
ROYER
VDD
DIM_FREQ
ENABLE
FLT_DLY
1
2
3
8 OLSNS
7 GND
6 ROYER
BRITE_IN 4
5 VDD
M Package
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
Name
VDD
GND
BRITE_IN
OL_SNS
ROYER
FLT_DLY
DIM_FREQ
FUNCTIONAL PIN DESCRIPTION
Description
Input Voltage. The IC will be functional and in specifications when this pin is between 4.5 and 5.5VDC.
Ground
Lamp Brightness Control. A DC input of 0 to 2V controls the duty cycle of the Royer output. Zero volts
corresponds to minimum duty cycle (3.125%), maximum input voltage must yield 100% duty cycle. BRITE_IN
has a high input impedance.
Open Lamp Sense Input. This input receives rectified and filtered voltages from each Royer transformer
secondary winding that are proportional to lamp current amplitude. These signals are diode OR’ed and
compared to 3VDC at the OL_SNS input. If an under limit condition is detected, a fault is declared and the output
is turned off. This condition is latched and can only be cleared by cycling the main power input or the ENABLE
input signal off and on.
Royer Bias Drive Output. This output signal drives external transistors that feed bias currents to one or more
oscillators to turn them on. Output drive is totem pole and must be capable of ±50mA at 0.4 and 4.0V output
when the supply voltage is 4.5 to 5.5 volts.
Fault Delay. An external resistor and capacitor at this pin program the time that open lamp fault detection is
disabled following power on or an ENABLE low to high transition. By choosing the appropriate resistor and
capacitor combination, delay time may be as high as 5 seconds
A resistor to ground determines the frequency of the dual slope ramp generator for the digital dimming PWM.
This pin may be overdriven through a resistor with totem pole output logic gates to force an external clock to over
ride the internal clock, allowing the ROYER output to be synchronized to an external frequency without using
another package pin. Input voltage levels of the external pulse are as follows:
High state is; 2.9 to 5.5V minus 0.4 volts noise margin for minimum of 2.5 volts.
Low state is; 0 to 0.36V plus 0.44 volts for noise margin for total of 0.8 volts.
ENABLE
A positive logic level enables the ROYER output pin. A low level turns it off, resets the fault latch and discharges
the FLT_DLY capacitor. Logic threshold is about 1.6V. Upon ENABLE going high (True), the fault delay
capacitor is allowed to charge, initiating the delay.
Copyright © 2004
Rev. 1.0a, 2006-01-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2


Part Number LX1695
Description Switched Royer CCFL Inverter Monitor IC
Maker Microsemi Corporation
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