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DC-DC and DC-AC Power Supply Information


Voltages used in Liquid Crystal Displays besides Vdd & Vss are sometimes required in situations where a high voltage backlight, wide temperature and/or graphic LCD modules have been specified.  This part of our web site contains the data sheets and application notes for the power conversion ICs and associated products. 

  High Voltage Backlight Solutions:
High voltage backlights will be typically be using DC to AC inverters, and their requirements will fall into two categories;
     - An EL Panel backlight which needs about 100VAC @ 400Hz
     - A CCFL backlight which typically needs 350VAC @ 35KHz
Solutions for a high voltage power supply for a backlight can be supplied by vendors specializing in these types of power supplies.  Qualified vendors have been listed in the Engineering Links section of our website.

Click on Model Number to see a detailed Adobe Acrobat .pdf data sheet

 

High Voltage Backlight Inverters and Application Notes
Model Number

Description

File Size
ELP Ap Note ERG - Application Notes for Smart Force EL Panel Inverters 154K
CCFL Ap Note ERG - Application Notes for CCFL Inverters 63K
ELP Data IMP - EL Panel product and application notes data book 1800K
 CCFL Data JKL - Understanding CCFLs - General background and design data 132K
MAX 1610-11 Maxim CCFL Inverter controller IC with digital brightness control 138K
MAX 1895-1995 Maxim CCFL Inverter controller IC - high efficiency and brightness control 1144K
Durel D365A Durel - DC to AC EL Panel Driver 257K

 

  Negative LCD Bias Voltage Solutions:
In situations where using a wide temperature and/or graphic LCD module, a negative voltage typically between -5V to -25V may be required.  Since the power requirements of this negative voltage is very low, there are several single chip solutions that will provide this voltage for you.  Two basic schemes are employed to create this voltage, a switched capacitive filter (less expensive, less efficient at 30-40%), and an inductive switching power inverter (more expensive, more efficient).  Solutions for these types of power supplies are listed below.  Also, qualified vendors have been listed in the Engineering Links section of our website.

Click on Model Number to see a detailed Adobe Acrobat .pdf data sheet

 

LCD Bias Voltage ICs
Model Number

Description

File Size
HT 7660 Holtek switched capacitor voltage converter 99K
ICL 7660S Intersil switched capacitor voltage converter 78K
LT 1617 Linear Technology inductive switching power inverter controller 137K
ICL 7662 Maxim switched capacitor voltage converter 331K
MAX680-681 Maxim switched capacitor voltage converter 85K
MAX 686 Maxim inductive switching power inverter controller with digitally controllable output voltage 195K
MAX 1044 Maxim switched capacitor voltage converter 117K
MC 34063A Fairchild inductive switching power inverter controller 45K
SCI 17654 Epson switched capacitor voltage converter 64K
SCI 7660 Epson switched capacitor voltage converter 52K
SCI 7661 Epson switched capacitor voltage converter 74K
TPS 61040-41 Texas Instruments inductive switching power inverter controller 269K

 

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● Whatever your design needs, Pacific Display Devices has the LCD display solution ●

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