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EC9223 Datasheet(PDF) 10 Page - E-CMOS Corporation |
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EC9223 Datasheet(HTML) 10 Page - E-CMOS Corporation |
10 / 13 page EC9223 Multi-Channel TFT LCD Supply E-CMOS Corp. (www.ecmos.com.tw) 5E26N-Rev. F001 10/13 Positive Charge Pump (VGH) The positive charge pump is used to generate the TFT LCD gate on voltage. The output voltage, VGH, can be set by an external resistive divider. Voltage VFBP is 1.2V. A single stage charge pump can produce an output voltage less than approximately twice the charge pump input voltage AVDD. The output voltage VGH is regulated as the following equation. The negative charge pump is used to generate the TFT LCD gate off voltage. The output voltage, VGL, is set with an external resistive divider from its output to REF with the midpoint connected to FBN. The error amplifier compares the feedback signal from FBN with an internal reference 240mV. The output voltage VGL is regulated as the following equation. VREF is 1.2V. VCOM Buffer The VCOM buffer generates the bias supply for the back plane of an LCD screen which is capacitively coupled to the pixel drive voltage. The purpose of the VCOM buffer is to hold the bias voltage steady while pixel voltage changes dynamically. The buffer is designed to sustain up to ±75mA of output current. In transients, it can deliver up to 150mA at which point the over current protection circuit limits the output current. Excessive current draw over a period of time may cause the chip temperature to rise and set off the over temperature protection circuit. |
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