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LX1695IDM-TR

Description
Switching Regulator/Controller, Voltage-mode, BIPolar, PDSO8
CategoryPower/power management    The power supply circuit   
File Size259KB,10 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Download Datasheet Parametric View All

LX1695IDM-TR Overview

Switching Regulator/Controller, Voltage-mode, BIPolar, PDSO8

LX1695IDM-TR Parametric

Parameter NameAttribute value
MakerMicrosemi
package instructionSOP, SOP8,.25
Reach Compliance Codecompliant
control modeVOLTAGE-MODE
JESD-30 codeR-PDSO-G8
Number of terminals8
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Package body materialPLASTIC/EPOXY
encapsulated codeSOP
Encapsulate equivalent codeSOP8,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE
Certification statusNot Qualified
surface mountYES
technologyBIPOLAR
Temperature levelINDUSTRIAL
Terminal formGULL WING
Terminal pitch1.27 mm
Terminal locationDUAL

LX1695IDM-TR Preview

LX1695
TM
®
Switched Royer CCFL Inverter Monitor IC
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1695 is a general purpose
DC to PWM generator with
supervisory functions for switched
Royer CCFL inverter modules used in
single or multiple lamp desktop
monitors and LCD TV sets.
It
integrates a PWM that generates
digital (burst mode) dimming from a
DC brightness control input, and a
protection circuit that shuts off the
Royer oscillator if lamp ignition does
not occur in a timely manner, or in the
event of one or more open lamps.
Strike and initial open lamp timeout is
user programmable with an external
RC, and PWM frequency is
programmable with a single external
resistor.
The DIM_FREQ pin can also accept
an external clock signal to program
and/or synchronize the Royer output
frequency.
This low cost eight pin IC includes
under-voltage lockout and a logical
ENABLE input that permits shutting
down the Royer inverter(s) remotely
without removing their power. A single
output pin can be expanded with
external transistors to drive any number
of Royer circuits, giving a single device
the ability to control very large displays
for LCD TV applications or single lamp
panels in notebooks and web tablets.
The device is available in either an 8
pin plastic DIP or SOIC package.
Single Resistor Programs
Output Frequency
Allows External Synchronized
PWM
Open Lamp Sense Protection
Programmable Fault Delay
Enable and UV Lockout
Preset 3.125% minimum
output duty cycle
APPLICATIONS/BENEFITS
DC to PWM Generator
Single or Multi Lamp Designs
Desktop Monitors
LCD TV
Industrial Displays
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
Wide Range Dimming For a Fixed Royer Inverter
External CLK Override
allows Syncronization
Single Resistor sets
Programmable Clock Frequency
30 to 600 Hertz x 512
OPTIONAL
DIM_FREQ
OLSNS
GND
ROYER
VDD
Open Lamp Detection Input
Gated for Royer High
Royer Inverter
Royer Bias Drive 30 to 600 Hertz
VDD
Fixed Input
Supply 4.5 to 5.5V
ENABLE
Logic High Enable
ENABLE
LX1695
FLT_DLY
BRITE_IN
BRITE_IN
Duty Cycle Control
0 to 2V = 3% to 100%
Programmable lamp
strike interval at
power on or enable
LX1695
LX1695
PACKAGE ORDER INFO
T
J
(°C)
-40 to 85
M
Plastic DIP
8-Pin
LX1695IM
Pb-free
Plastic SOIC
DM
8-Pin
LX1695IDM
Pb-free
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e.
LX1695IDM-TR)
Copyright
©
2004
Rev. 1.0, 2004-08-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX1695
TM
®
Switched Royer CCFL Inverter Monitor IC
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
WWW .
Microsemi
.C
OM
Supply Voltage (V
DD
) ........................................................................................6V
Inputs (BRITE_IN, OLSNS, FLT_DLY, ENABLE, DIM_FREQ)................. V
DD
Output Current (ROYER) ...........................................................................150mA
Peak Package Solder Reflow Temp (40 seconds Maximum Exposure)........ 255°C (+5, -0)
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
.
DIM_FREQ
ENABLE
FLT_DLY
BRITE_IN
1
8
7
6
5
OLSNS
GND
ROYER
VDD
2
3
4
DM Package
(Top View)
THERMAL DATA
DIM_FREQ
ENABLE
1
2
3
4
8
7
6
5
OLSNS
GND
ROYER
VDD
M
DM
Plastic 8-Pin DIP
85°C/W
THERMAL RESISTANCE
-
JUNCTION
A
MBIENT
,
θ
JA
FLT_DLY
BRITE_IN
Plastic 8-Pin SOIC
163°C/W
M Package
(Top View)
Pb-free 100% Matte Tin Lead Finish
THERMAL RESISTANCE
-
JUNCTION
A
MBIENT
,
θ
JA
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
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
Name
VDD
GND
BRITE_IN
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.
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.
Description
Input Voltage. The IC will be functional and in specifications when this pin is between 4.5 and 5.5V
DC
.
OL_SNS
ROYER
FLT_DLY
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
DIM_FREQ
ENABLE
Copyright
©
2004
Rev. 1.0, 2004-08-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX1695
TM
®
Switched Royer CCFL Inverter Monitor IC
P
RODUCTION
D
ATA
S
HEET
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage (V
DD
)
BRITE Linear DC Voltage Range
DIM_FREQ, ENABLE, FLT_DLY
Royer Output Frequency Range
WWW .
Microsemi
.C
OM
Min
4.5
0
0
30
LX1695
Typ
Max
5.5
1.95
V
DD
600
Units
V
V
V
Hz
250
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, specifications apply over the range: T
A
=-40 to 85
O
C, V
DD
= 4.5 to 5.5V, R
DIM_FREQ
=25.2K ohms, Royer = 1000pF
ENABLE = V
DD
, BRITE_IN = 1.0V, FLT_DLY = 3V
Parameter
POWER
V
VDD
Dynamic Current
Output Off Mode Current
Enable Threshold
ENABLE Input High Current
ENABLE Input Low Current
UV Threshold
UV Hysteresis
ROYER
ROYER Output Sink Current
ROYER Output Source Current
ROYER Output Rise Time
ROYER Output Fall Time
DIM FREQ
DIM_FREQ Voltage
DIM_FREQ ISC
LOW ROYER Output Frequency
NOMINAL ROYER Output
Frequency
HIGH ROYER Output Frequency
DIM_FREQ IIH
DIM_FREQ IIL
Symbol
I
DD
I
_OUT OFF
V
IH
V
IL_
I
IH_ENABLE
I
IL_ENABLE
UV
TH
Test Conditions
V
DD
=5.5V
V
DD
=5.5V; Enable
0.4V
Min
LX1695
Typ
4.0
3.5
Max
Units
mA
mA
V
V
µA
µA
V
mV
mA
mA
nS
nS
V
µA
Hz
Hz
Hz
µA
µA
Hz
2
V
DD
=5V; ENABLE = 5V
V
DD
=5V; ENABLE = 0V
V
DD
Rising
-1
-1
3.7
0.01
-0.01
4
350
75
100
20
20
1
-600
30
250
600
120
-475
DIM_FREQ
512
0.8
1
1
4.3
I
SK_ROYER
I
SRC_ROYER
T
R
T
F
V
DIM_FREQ
ISC
DIM_FREQ
F
ROYER LOW
F
ROYER NOM
F
ROYER HIGH
IIH
DIM_FREQ
IIL
DIM_FREQ
BRITE_IN = 2V ROYER = 0.4V
BRITE_IN = 2V ROYER = VDD-0.5V
C
OUT
= 1000pF
C
OUT
= 1000pF
40
100
100
DIM_FREQ = 0V; self limiting
R
DIM_FREQ
= 215K
R
DIM_FREQ
= 25.2K
R
DIM_FREQ
= 10K
DIM_FREQ = 3V; No R
DIM_FREQ
DIM_FREQ = 0.4V; No R
DIM_FREQ
DIM_FREQ = 15KHz to 300KHz Square Wave
27
237
555
33
263
645
EXT CLK ROYER Output Frequency
F
ROYER EXT_CLK
BRITE_IN / DUTY CYCLE CONTROL
BRITE_IN Input High Current
I
IH_BRITE_IN
V
DD
=5V; BRITE_IN = 2V
BRITE_IN Input Low Current
I
IL_BRITE_IN
V
DD
=5V; BRITE_IN = 0V
Duty Cycle 0
DC
0
BRITE_IN = 0V;
Duty Cycle 1
DC
1
BRITE_IN = 1V
Duty Cycle 2
DC
1
BRITE_IN = 1.95
VDAC Ramp Valley Voltage
VDAC
RP
For reference only
VDAC Ramp Peak Voltage
VDAC
RV
For reference only
OLSNS / FAULT DELAY THRESHOLD
OLSNS Threshold Voltage
V
TH_OLSNS
OLSNS Clock Cycle Delay
OLSNS
DY
Note 1
FLT_DLY Threshold
FLT_DLY
TH
Note 1 : If duty cycle is set to less than 10% open lamp sensing is internally disabled
-1
-1
2.5
95
0.01
-0.01
3.125
52
100
40
1.9
3
48
2.1
1
1
5
µA
µA
%
%
%
mV
V
‘V
cycles
V
E
LECTRICALS
E
LECTRICALS
2.92
3.05
Copyright
©
2004
Rev. 1.0, 2004-08-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX1695
TM
®
Switched Royer CCFL Inverter Monitor IC
P
RODUCTION
D
ATA
S
HEET
SIMPLIFIED BLOCK DIAGRAM
WWW .
Microsemi
.C
OM
ENABLE
Enable
UVLO
PwrBad
Bias
Generator
3V
1V
2.1V
Enable
PwrBad
Fault
Latch
R
Q
S
NoFault
Ignore_OLSNS
PWM
OLSNS
3V
48 Count
Ignore fault
Logic
2V
0V
Clock
PwrBad
Clock
9 Bit Dual Ramp
DAC
BRITE_IN
PWM
3.125% Min
Duty Cycle
VDD
PwrBad
FAULT_
DLY
Ignore_OLSNS
2.1V
NoFault
Power
Buffer
ROYER
Enable
PwrBad
Enable
Internal
Clock
Generator
B
LOCK
D
IAGRAM
B
LOCK
D
IAGRAM
1V
A
B
MUX
OUT
SEL
Clock
DIM_FREQ
External
Clock
Detector
Figure 1 –
Simplified Block Diagram
Copyright
©
2004
Rev. 1.0, 2004-08-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX1695
TM
®
Switched Royer CCFL Inverter Monitor IC
P
RODUCTION
D
ATA
S
HEET
APPLICATION CIRCUIT
L1
F1
CN1
T1
ROYER TX
CN2
WWW .
Microsemi
.C
OM
VIN
GND
+5V
ENABLE
BRITE_IN
C1
C2
C3
Q1
Q2
LX1695 Circuit
+5V
VINS
Enable
Approximate
R1 510
DIM FREQ =
6300
R2
[Hz], R [K
]
R2 24.9K 1%
1
D1
BAV70
DIM_FREQ
ENA
FLT_DLY
BRITE_IN
OLSNS
GND
ROYER
VDD
8
N.C.
Enable
2
7
R3
56K
+5V
C4
0.22µF
R5 2.2M
C5
1µF
3
6
R4
470
VIN
Royer Input Voltage (Buck Output)
+5V
5VDC for LX1695
5V ±5%
100mA
ENABLE
CIRCUIT On / Off Signal
5V Logic Level > 2.4V : On | <0.8V : Off
4
5
+5V
C6
1µF
LX1695
VINS
Q4
BC847A
Q3 DTA114
R6 10K
BRITE_IN
Burst Duty Control Voltage
0V ~ 2V = 3.125% ~ 100%
Q5 DTC144
D2
5.6V
Option: If system can not
provide 5V, use this circuit.
Figure 2 –
Typical Application
A
PPLICATIONS
A
PPLICATIONS
Copyright
©
2004
Rev. 1.0, 2004-08-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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