LT1943 works

T1943 is a highly integrated power supply IC, including four independent switching regulator. All four switches are used with a frequency foldback and the respective current-mode control oscillator, a block diagram of each switching power supply shown in Figure 2. Switching regulator includes a 2.4A buck regulator and current limiting. Switching regulator 2 is a step-up regulator, and has a 2.6A current limit. Switching regulator 3 and 4 are 0.35A boost regulator. 4 has two switching regulator feedback pin (FB4 and NFB4),Character LCD Module able to directly adjust the output voltage positive or negative.
When power is applied to VIN, RUN-SS pin starts charging when the voltage reaches 0.8V, switch 1 is enabled. RUN-SS pin is used for soft start and can limit VLOGIC climb rate. In RUN-SS pin using a larger capacitor will cause VLOGIC start more slowly. Switching Regulator 2, 3 and 4 by the BIAS pin is driven, it is necessary together with VLOGIC. VLOGIC is the first entry, when it reaches 2.8V,, SS-234 pin will start to charge, to enable the switch 3 and 4. Then AVDD and VOFF will rise, climb rate depends on the SS-234 pin is connected to capacitor size. When AVDD reaches close to 90% of their time programmable voltage, PGOOD pin will retreat low. When all outputs are programmable voltage reaches 90% of their time, CT timer will trigger, 20uA current source begins charging the CT pin. When the CT pin reaches 1.1V, the output separation PNP open connection VON. When any of the four output a falls below 10% of nominal voltage, the protection circuit will drive plane CT pin to ground, stopping VON. This prevents VON TFT display withstand inrush current, the inrush current will cause the entire display is suddenly illuminated, which may damage the monitor.
Conclusion
No matter what kind of flat panel display technology will become dominant, a new era of flat panel display technology is bound to permeate all aspects of life. In the coming years, CRT TV market will be dominated, but their demise is inevitable. In the TFT 40x2 lcd display mainstream before it can continue 3-5 years, TFT LCD The main problem is to further reduce its manufacturing costs, but the power required for proper IC already in use. LT1943 is a recent example, it has a high level of integration, is currently on the market for TFT LCD compact and designers bring secure power solutions.