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| LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET * DESCRIPTION KEY FEATURES * Drives Up To 6 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 1mA Steps from 10 to 25mA 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 * Over Voltage Protection * LED Over Temperature Protection Input APPLICATIONS * Medium Size White LED Backlight LCD Displays * Portable Instrumentation Displays * Medical Instrument Displays LXMG1960-28-0x module is a boost white LED driver for medium size LCD LED backlight panels. It is designed to drive up to six strings of LEDs to a maximum of 35V at up to 25mA per string. The module consists of a boost converter and six programmable 10-25 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 1mA steps through an on board DIP switch. The LXMG1960-28-0x 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 two output connectors. WWW .Microsemi .C OM IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com Patents Pending PRODUCT HIGHLIGHT Wide Input Voltage Range 4.75V to 28V CN1 LXMG1960-28-01 Drives Six String LED Panels. LED String Voltage up to 35V SW1 SW2 SW3 SW4 DIMMING INPUT: Analog - Current Amplitude Dimming CN2 Precision String-to-String Current Matching 1 ON 2 3 4 DC Voltage Source Potentiometer PWM Signal Supports Multi-Method Analog Dimming Externally Programmable LED String Current From 10mA to 25mA in 1mA Steps LXMG1960-28-0x ORDER INFORMATION Part Number LXMG1960-28-01 LXMG1960-28-03 Input Connector Molex 53261-0871 or equivalent Output Connector Molex 53261-0771 or equivalent Hirose DF14A-15P-1.25H or equivalent Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 1 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN)................................................................................................................................................. -0.3V to 30V Input Power ...................................................................................................................................................................... 6.2W Output String Current ....................................................................................................................... 27mA (Internally Limited) Output String Voltage .......................................................................................................................... 36V (Internally Limited) Output Power ................................................................................................................................................................... 5.5W CSx Pins ............................................................................................................................................................... -0.3V to 28V Input Signal Voltage (ENABLE Input)..................................................................................................................... -0.3V to VIN Input Signal Voltage (OT)........................................................................................................................................ -0.3V to 5V Input Signal Voltage (BRITE_A).............................................................................................................................. -0.3V to 6V Ambient Operating Temperature, zero airflow ....................................................................................................-30C to 80C Storage Temperature Range ..............................................................................................................................-40C to 85C 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. WWW .Microsemi .C OM 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 Input Supply Voltage Range Linear BRITE_A Control Input Voltage Range LED String Voltage Each Cathode Sink Current Operating Ambient Temperature Range Symbol VIN VBRITE_A VLED CSISINK TA Min 4.75 0.2 VIN 10 -30 R.C. 12 Max 28 2.2 35* 25 75 Units V V V mA 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 0C to 60C except where otherwise noted; VIN = 4.75V; BRITE_A = Open; ENABLE = VIN; DIP-SW1~4 = ON; OT = open Parameter Input Voltage Off Current Supply Current Supply Current Supply Current After Fault Timeout Estimated Efficiency Symbol VIN IIN(MIN) IRUN_5 IRUN_12 IFAULT ENABLE = 0V VIN = 5V; VLED = 31.2V, ILED = 25mA; 6 Strings VIN = 12V;V LED = 31.2V, ILED = 25mA; 6 Strings Open all output strings Fault Timeout VIN = 12V; VLED = 31.2V, ILED = 25mA; 6 Strings 80 Test Conditions / Comment Min 4.75 Typ 12 13 1.25 0.5 6 85 Max 28 100 1.5 0.6 10 Units V A A A mA % LXMG1960-28-0x Logic ENABLE Input Low Voltage ENABLE Input Hi Voltage ENABLE VL ENABLE VH 0 2.0 0.8 VIN V V Dimming BRITE_A voltage for Full Bright Copyright (c) 2009 Rev. 1.1, 2009-11-25 VBRITE_A 1.8 2.0 2.2 V Page 2 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 0C to 60C except where otherwise noted; VIN = 4.75V; BRITE_A = Open; ENABLE = VIN; DIP-SW1~4 = ON; OT = open WWW .Microsemi .C OM Parameter Potentiometer Dimming on BRITE_A PWM Frequency Range for BRITE_A BRITE_A PWM Voltage BRITE_A Sink Current Output Current Dim Range (Analog Dimming) LED Current On Rise Time LED Current Off Fall Time Symbol POT fBRITE_A VBRITE_A-PWM IBRITE_A Test Conditions / Comment Min 400 100 2.5 Typ 500 Max 600 25000 5.5 Units k Hz V A RATIO ns ns BRITE_A = 0V ILED = 25mA, BRITE_A = 0V Versus BRITE_A 2.2V 12 10 200 400 TCS_Rise TCS_Fall Voltage at CSx pin that latches off its respective string. Voltage at CSx pin that clamps Anode Output 23 Device Protection LED Short Protection Threshold CS Pin Over-voltage Limit Nominal LED DC Current Programming Range LED DC Current LED DC Current LED DC Current LED DC Current LED DC Current LED DC Current Current Matching between strings. Regulated CS Pin Voltage VcsSD VCSOV 15 25 27 V V LED Current Sink Outputs ICS ICSMIN ICS1 ICS2 ICS3 ICS4 ICSMAX Combination of DIP switch1~4 ON/OFF VDIP-SW1~4 = OFF Delta current SW1~4 = OFF to DIP-SW1= ON Delta current SW1~4 = OFF to DIP-SW2= ON Delta current SW1~4 = OFF to DIP-SW3= ON Delta current SW1~4 = OFF to DIP-SW4= ON VDIP-SW1~4 = ON VCSX = 0.8V to 5V At the lowest CS pin, ICSX = 25mA; 10 9.5 0.95 1.9 3.8 7.6 23.75 -2 0.5 0.9 10 1 2 4 8 25 25 10.5 1.05 2.1 4.2 8.4 26.25 2 mA mA mA mA mA mA mA % V LED String Voltage LED String Voltage LED Over Temperature Shut Down Threshold Over Temperature Recovery Voltage OT Sink Current VLED VOT VOT IOT OT = 0V Rated LED current VIN 35 V LED Panel Thermal Protection 1.47 1.8 240 V LXMG1960-28-0x V A Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 3 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET FUNCTIONAL PIN DESCRIPTION Name CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 CN2-1 CN2-2 CN2-3 CN2-4 CN2-5 CN2-6 CN2-7 CN3-1 CN3-2 CN3-3 CN3-4 CN3-5 CN3-6 CN3-7 CN3-8 CN3-9 CN3-10 CN3-11 CN3-12 CN3-13 CN3-14 CN3-15 Pin # Description WWW .Microsemi .C OM CN1 (Molex 53261-0871) for LXMG1960-28-01/03 VIN GND ENABLE OT BRITE_A NC Anode CSA CSB CSC CSD CSE CSF Anode CSA Anode CSB Anode CSC Anode CSD Anode CSE Anode CSF N/A N/A N/A Main Input Power Supply 4.75V to 28V Power Supply Return ON/OFF Control. (ENABLE = 0V = OFF, ENABLE = 2V = ON) Operating Temperature Detection Input. A Thermistor Usually Is Connected This Pin To The Ground. Analog Dimming Input. BRITE_A 0~2.5VIo 10%~100%. 100Hz CN3 (Hirose DF14A-15P-1.25H) for LXMG1960-28-03 LXMG1960-28-0x Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 4 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET DIP SWITCH LED STRING CURRENT SETTINGS SW1 (1mA) OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON SW2 (2mA) OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON OFF OFF ON ON SW3 (4mA) OFF OFF OFF OFF ON ON ON ON OFF OFF OFF OFF ON ON ON ON SW4 (8mA) OFF OFF OFF OFF OFF OFF OFF OFF ON ON ON ON ON ON ON ON LED String Current 10mA 11mA 12mA 13mA 14mA 15mA 16mA 17mA 18mA 19mA 20mA 21mA 22mA 23mA 24mA 25mA Notes Minimum String current WWW .Microsemi .C OM Maximum String Current DIP Switch S1 1 ON UP - ON 3 4 2 DOWN - OFF Example shows S1 programmed for 20mA LED String Current LXMG1960-28-0x Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 5 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET SIMPLIFIED BLOCK DIAGRAM +5V ENABLE VIN LED High Side Drive Voltage 1 2 3 4 5 6 7 8 WWW .Microsemi .C OM CSA BRITE_A CSB CSC Control Circuitry +5V CSD 9 CSE 10 11 CSF 12 13 14 15 20.5k OT CN3 ANODE CSA 1 2 3 4 5 6 7 GND DIP Switch SW1 SW2 SW3 SW4 CSB CSC CSD CSE CSF CN2 MECHANICAL DRAWING 3.6mm 0.142in. GROUNDED MOUNTING HOLE 3.18MM .08 DIA. 49.88mm 0.2 1.96in. 6.0 mm MAX 0.236 in. 27.9 mm 1.098 in. CN1 21.08 mm 0.2 0.83 in. SW1 SW2 SW3 SW4 1 ON LXMG1960-28-0x 2 3.22mm 0.127in CN3 CN2 3 4 69 mm 2.72in. MOUNTING HOLE 3.18MM .08 DIA. 1.0 mm 0.039 in. Dimensions are in millimeters (inches are for reference only) PCB tolerances 0.5mm , M3 recommended mounting screws Weight: (8g) typ. Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 6 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET APPLICATION INFORMATION 4.75V to 28V ANODE CSA ANODE CSB LXMG1960-28-0x ANODE CSC BRITE_A ANODE CSD ANODE CSE ANODE ENABLE GND CSF VIN The LED string current and therefore the brightness may be controlled by the BRITE_A input. The typical dimming range using the BRITE_A input alone is 10:1. The BRITE_A input may come from a voltage output DAC or other voltage source, a 500k digital or manual pot, or a PWM signal in the range of 100 Hz to 25 kHz. The module contains an internal 422k pull-up to typically 5V to provide bias if using a pot. Logic levels may be used up to 5V, however the inverter will reach maximum current at less than 100% duty cycle. This can be calculated as approximately 2.3V divided by the logic high voltage level; with 3.3V logic level this corresponds to about 70% duty cycle for maximum string current. If you need to turn the module ON/OFF remotely, connect to TTL logic signal to the ENABLE input. WWW .Microsemi .C OM Voltage Source, DAC, or Potentiometer 0V to 2.5V 500k Figure 1 It is to be noted that although the module provides for a wide input voltage range 4.75V to 28V it is designed as a boost only converter. Therefore the input voltage should not exceed the LED string voltage. Use of an external thermistor connected from OT pin to ground will provide over temperature protection (see figure 2). The module can provide for the gradual scaling back of LED string current until it is completely shut off based on the voltage level impressed on the OT input. When the voltage on the OT pin decreases below 2.48V the string current will begin to decrease until it is completely shut off when OT reaches 1.47V. This corresponds to a thermistor value of about 8542 ohms at string current shutdown. As an example using a 100k (at 25C) NTC thermistor with a B Constant of 4250 will provide a thermal profile where the module will begin to scale back the LED string currents at a temperature (as measured by the thermistor) greater than 60C and shut down the string current if the temperature exceeds 85C. Although the module provides open circuit string protection, if the common LED high side drive voltage (Anode) is directly shorted to ground this will result in damage to the fuse and possible damage to the Schottky diode. Likewise if any of the low side current sink drivers (CSx) are directly shorted to ground it will result in damage to the fuse, Schottky diode and possibly the LED string. +5V 20.5k OT (pin 6) VRT RT NTC 5 VRT = 20.5k + R x RT T Figure 2 LXMG1960-28-0x Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 7 LXMG1960-28-0x TM (R) 6-String 5W LED Backlight Boost Driver Module PRODUCTION DATASHEET NOTES WWW .Microsemi .C OM LXMG1960-28-0x PRODUCTION DATA - Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright (c) 2009 Rev. 1.1, 2009-11-25 Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 8 |
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