LXMG1930-28-04

LXMG1930-28-0x TM ® 3-String 5W LED Backlight Boost Driver Module P RODUCTION D ATASHEET 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 • Medium Size White LED Backlight LCD Displays • Portable Instrumentation Displays • Medical Instrument Displays 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. W WW . 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 LXMG1930-28-01 CN4 Drives Up To Three String LED Panels. LED String Voltage up to 35V SW1 SW2 SW3 SW4 DIMMING INPUT: Analog – Current Amplitude Dimming 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 15mA to 50mA in 5mA Steps LXMG1930-28-0x ORDER INFORMATION Part Number LXMG1930-28-01 LXMG1930-28-03 LXMG1930-28-04 Input Connector Molex 53261-0871 or equivalent Output Connector Molex 53261-0471 or equivalent Hirose DF19G-8P-1H or equivalent Kyocera 04-6298-006-000-883+ or equivalent Copyright © 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 LXMG1930-28-0x TM ® 3-String 5W LED Backlight Boost Driver Module P RODUCTION D ATASHEET ABSOLUTE MAXIMUM RATINGS Input Voltage (VIN)................................................................................................................................................. -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. W WW . 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 15 -30 R.C. 12 Max 28 2.2 35* 50 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 0°C to 60°C except where otherwise noted; VIN = 4.75V; BRITE_A = Open; ENABLE = VIN; DIP-SW1~3 = ON; OT = open Parameter Input Voltage Sleep Current Supply Current Supply Current Supply Current During Fault Timeout Estimated Efficiency Symbol VIN IIN(MIN) IRUN5 IRUN12 IFAULT η ENABLE = 0V VIN = 5V; VLED = 31.2V, ILED = 50mA; 3 Strings VIN = 12V; VLED = 31.2V, ILED = 50mA; 3 Strings Open All Output Strings Fault Timeout VIN = 12V; VLED = 31.2V, ILED = 50mA; 3 Strings 80 0.5 6 85 Test Conditions / Comment Min 4.75 Typ 12 20 Max 28 100 1.5 0.6 10 Units V µA A A LXMG1930-28-0x mA % Logic ENABLE Input Low Voltage ENABLE Input Hi Voltage ENABLE VL ENABLE VH DIP-SW1~3 = ON 2.0 0.8 VIN V V DIMMING BRITE_A voltage for Full Bright Copyright © 2009 Rev. 1.1, 2009-11-25 VBRITE_A 1.8 2.0 2.2 V Microsemi Analog Mixed Signal Group 11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570 Page 2 LXMG1930-28-0x TM ® 3-String 5W LED Backlight Boost Driver Module P RODUCTION D ATASHEET 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; VIN = 4.75V; BRITE_A = Open; ENABLE = VIN; DIP-SW1~3 = ON; OT = open W WW . 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 kΩ Hz V µA RATIO ns ns BRITE_A = 0V ILED = 50mA, 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 LED DC Current Programming Range 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 ΔICSA ΔICSB ΔICSC ICSMAX Combination of DIP Switch1~3 ON/OFF VDIP-SW1~3 = OFF Delta current SW1~3 = OFF to DIP-SW1= ON Delta current SW1~3 = OFF to DIP-SW2= ON Delta current SW1~3 = OFF to DIP-SW3= ON VDIP-SW1~3 = ON VCSX = 0.8V to 5V At the lowest CS pin, ICSX = 50mA; DIP- SW1~3 = ON VLED VOT VOT IOT OT = 0V Rated LED current 15 14.25 4.75 9.5 19 47.5 -2 0.5 0.9 15 5 10 20 50 50 15.75 5.25 10.5 21 52.5 2 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 VIN 35 V LED Panel Thermal Protection 1.47 1.8 240 V V LXMG1930-28-0x µA Copyright © 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 LXMG1930-28-0x TM ® 3-String 5W LED Backlight Boost Driver Module P RODUCTION D ATASHEET W WW . Microsemi . C OM FUNCTIONAL PIN DESCRIPTION Name CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 Pin # Description CN1 (Molex 53261-0871) for LXMG1930-28-0x VIN GND ENABLE OT BRITE_A NC 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 From This Pin To Ground. Analog Dimming Input. BRITE_A 0~2.2V→Io 10%~100%. 100Hz