LM171WX3-TLC2_CAS_ver1_2_Dell_20080822课件.ppt

;CONTENTS;RECORD OF REVISIONS;1. General Description;2. Absolute maximum ratings;3. Electrical specifications;9. Requirements for a system inverter design, which is intended to have a better display performance, a better power efficiency and a more reliable lamp. It shall help increase the lamp lifetime and reduce its leakage current. a. The unbalance rate of the inverter waveform should be 10% below; b. The distortion rate of the waveform should be within √2 ±10%; c. The ideal sine wave form shall be symmetric in positive and negative polarities. d. It should be measured with lamp currents of high voltage side. * Asymmetry rate = | I p – I –p | / Irms x 100% * Distortion rate = I p (or I –p) / Irms 10. Inverter open voltage must be more than lamp starting voltage. 11. The inverter which is combined with this LCM, is highly recommended to connect coupling(ballast) condenser at the high voltage output side. When you use the inverter which has not coupling(ballast) condenser, it may cause abnormal lamp lighting because of biased mercury as time goes. 12. Permissive power ripple should be measured under VCC=5.0V, 25°C, fV(frame frequency)=MAX condition and At that time, we recommend the bandwidth configuration of oscilloscope is to be under 20Mhz. See the next page. ; Permissive Power input ripple (VCC=5.0V, 25°C fV (frame frequency)=MAX condition);3-2. Interface Connections;Notes: 1. All GND(ground) pins should be connected together and should also be connected to the LCD’s metal frame. 2. All VCC(power input) pins should be connected together. 3. All NC pins should be separated from other signal or power. 4. PWM_OUT signal controls the burst frequen