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LXMG1930-28-04

P1-P3P4-P6P7-P8
LXMG1930-28-0x
PRODUCTION DATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2009
Rev. 1.1, 2009-11-25
3-String 5W LED Backlight Boost Driver Module
TM
®
WWW.Microsemi .COM
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DESCRIPTION
KEY FEATURES
•
Drives Up To 3 String LED Panels
• Strings Can Be Combined For
Higher Current
• Wide Input Voltage 4.75V-28V
• String Voltage Up To 35V
• LED String Current Programmable
in 5mA Steps from 15mA to 50mA
For Matching Various Panel
Requirements
• 1% Typical String-to-String
Current Matching
• Analog Dimming Provides For a
10:1 Ratio
• Supports Multiple Methods Of
Dimming Such As DC Voltage,
PWM Signal and Potentiometer
• Output Over Voltage Protection
• LED Over Temperature Protection
Input
APPLICATIONS
LXMG1930-28-0x module is a boost
white LED driver for medium size LCD
LED backlight panels. It is designed to
drive up to three strings of LEDs to a
maximum of 35V at up to 50mA per string.
The module consists of a boost
converter and three programmable 15 to 50
mA precision current sinks. It is designed
to work over a wide input voltage range
(4.75V to 28V) providing maximum
flexibility. However the converter is a
boost only design requiring the input
supply voltage to not exceed the output
LED string voltage.
The module provides a dimming input:
BRITE_A which adjusts the LED display
brightness by controlling the amplitude of
the LED string current.
The BRITE_A input is very flexible
and can be controlled by a PWM signal,
the application of a DC control voltage or
use of a potentiometer tied as a rheostat.
Precision current mirror circuitry
typically provides for 1% percent string to
string matching at the rated output current.
The magnitude of the string current is
easily programmed, in 5mA steps through
an on board DIP switch.
The LXMG1930-28-0x includes over
voltage protection (OVP), and short and
open LED protection. If one string opens,
its current sink will be disabled and the
other strings will continue to operate
normally. Likewise if one or several LEDs
in a string short it will continue to function
with no adverse affect on the other strings.
With the use of an external thermistor the
module can provide LED current fold back
in an over temperature situation.
The module comes in a small form
factor PCB and uses an 8 pin input and one
of three output connectors.
• Medium Size White LED Backlight
LCD Displays
• Portable Instrumentation Displays
• Medical Instrument Displays
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Patents Pending
PRODUCT HIGHLIGHT
DC Voltage
Source
Potentiometer
PWM Signal
SW1
SW2
SW3
SW4
CN4
CN1
X
Externally
Programmable LED
String Current From
15mA to 50mA in
5mA Steps
Drives Up To Three
String LED Panels. LED
String Voltage up to 35V
Precision
String-to-String Current
Matching
Supports Multi-Method
Analog Dimming
1
2
34
ON
DIMMING INPUT:
Analog – Current Amplitude
Dimming
Wide Input
Voltage Range
4.75V to 28V
LXMG1930-28-01
ORDER INFORMATION
Part Number Input Connector Output Connector
LXMG1930-28-01 Molex 53261-0471 or equivalent
LXMG1930-28-03 Hirose DF19G-8P-1H or equivalent
LXMG1930-28-04
Molex 53261-0871 or equivalent
Kyocera 04-6298-006-000-883+ or equivalent
LXMG1930-28-0x
PRODUCTION DATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2009
Rev. 1.1, 2009-11-25
3-String 5W LED Backlight Boost Driver Module
TM
®
WWW.Microsemi .COM
L
L
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ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
).................................................................................................................................................-0.3V to 30V
Input Power...................................................................................................................................................................... 6.2W
Output String Current ....................................................................................................................... 53mA (Internally Limited)
Output String Voltage .......................................................................................................................... 38V (Internally Limited)
Output Power ................................................................................................................................................................... 5.5W
Input Signal Voltage (ENABLE Input)....................................................................................................................-0.3V to 30V
Input Signal Voltage (OT)........................................................................................................................................-0.3V to 5V
Input Signal Voltage (BRITE_A)..............................................................................................................................-0.3V to 6V
Ambient Operating Temperature, zero airflow ....................................................................................................-30°C to 80°C
Storage Temperature Range ..............................................................................................................................-40°C to 85°C
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.
RECOMMENDED OPERATING CONDITIONS (R.C.)
This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance will be
obtained if the module is operated under the condition listed in the ‘R.C.’ column. Min. and Max. columns indicate values beyond which the
inverter, although operational, might not function optimally.
Parameter Symbol Min R.C. Max Units
Input Supply Voltage Range V
IN
4.75 12 28 V
Linear BRITE_A Control Input Voltage Range V
BRITE_A
0.2 2.2 V
LED String Voltage V
LED
V
IN
35* V
Each Cathode Sink Current CS
ISINK
15 50 mA
Operating Ambient Temperature Range T
A
-30 75 °C
* Input supply voltage should not exceed LED string voltage as this will result in excessive power dissipation in the module.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0°C to
60°C except where otherwise noted; V
IN
= 4.75V; BRITE_A = Open; ENABLE = V
IN
; DIP-SW1~3 = ON; OT = open
Parameter Symbol Test Conditions / Comment Min Typ Max Units
Input Voltage V
IN
4.75 12 28 V
Sleep Current I
IN(MIN)
ENABLE = 0V 20 100 µA
Supply Current I
RUN5
V
IN
= 5V; V
LED
= 31.2V, I
LED
= 50mA; 3 Strings 1.5 A
Supply Current I
RUN12
V
IN
= 12V; V
LED
= 31.2V, I
LED
= 50mA; 3
Strings
0.5 0.6 A
Supply Current During Fault
Timeout
I
FAULT
Open All Output Strings Fault Timeout 6 10 mA
Estimated Efficiency
η
V
IN
= 12V; V
LED
= 31.2V, I
LED
= 50mA; 3
Strings
80 85 %
Logic
ENABLE Input Low
Voltage
ENABLE V
L
0.8 V
ENABLE Input Hi Voltage
ENABLE V
H
DIP-SW1~3 = ON 2.0 V
IN
V
DIMMING
BRITE_A voltage for Full
Bright
V
BRITE_A
1.8 2.0 2.2 V
LXMG1930-28-0x
PRODUCTION DATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2009
Rev. 1.1, 2009-11-25
3-String 5W LED Backlight Boost Driver Module
TM
®
WWW.Microsemi .COM
L
L
X
X
M
M
G
G
1
1
9
9
3
3
0
0
-
-
2
2
8
8
-
-
0
0
x
x
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0°C to
60°C except where otherwise noted; V
IN
= 4.75V; BRITE_A = Open; ENABLE = V
IN
; DIP-SW1~3 = ON; OT = open
Parameter Symbol Test Conditions / Comment Min Typ Max Units
Potentiometer Dimming on
BRITE_A
POT 400 500 600 kΩ
PWM Frequency Range
for BRITE_A
f
BRITE_A
100 25000 Hz
BRITE_A PWM Voltage V
BRITE_A-PWM
2.5 5.5 V
BRITE_A Sink Current I
BRITE_A
BRITE_A = 0V 12 µA
Output Current Dim Range
(Analog Dimming)
I
LED
= 50mA, BRITE_A
= 0V Versus BRITE_A
> 2.2V
10 RATIO
LED Current On Rise Time T
CS_Rise
200 ns
LED Current Off Fall Time T
CS_Fall
400 ns
Device Protection
LED Short Protection
Threshold
Vcs
SD
Voltage at CSx pin that latches off its
respective string.
15 V
CS Pin Over-Voltage Limit V
CSOV
Voltage at CSx pin that clamps Anode Output 23 25 27 V
LED Current Sink Outputs
LED DC Current
Programming Range
I
CS
Combination of DIP Switch1~3 ON/OFF 15 50 mA
LED DC Current I
CSMIN
VDIP-SW1~3 = OFF 14.25 15 15.75 mA
LED DC Current ΔI
CSA
Delta current SW1~3 = OFF to DIP-SW1= ON 4.75 5 5.25 mA
LED DC Current ΔI
CSB
Delta current SW1~3 = OFF to DIP-SW2= ON 9.5 10 10.5 mA
LED DC Current ΔI
CSC
Delta current SW1~3 = OFF to DIP-SW3= ON 19 20 21 mA
LED DC Current I
CSMAX
VDIP-SW1~3 = ON 47.5 50 52.5 mA
Current Matching Between
Strings.
V
CSX
= 0.8V to 5V -2 2 %
Regulated CS Pin Voltage
At the lowest CS pin, I
CSX
= 50mA;
DIP- SW1~3 = ON
0.5 0.9 V
LED String Voltage
LED String Voltage V
LED
Rated LED current V
IN
35 V
LED Panel Thermal Protection
LED Over Temperature
Shut Down Threshold
V
OT
1.47 V
Over Temperature
Recovery Voltage
V
OT
1.8 V
OT Sink Current I
OT
OT = 0V 240 µA
P1-P3P4-P6P7-P8

LXMG1930-28-04

Mfr. #:
Buy LXMG1930-28-04
Manufacturer:
Microchip / Microsemi
Description:
LED DRIVER CC BOOST 35V 50MA
Lifecycle:
New from this manufacturer.
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