TPS65192 datasheet(10/25 Pages) TI

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CHANNELS8-9

CHANNELS1-7

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OutputCurrent

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DETAILED DESCRIPTION

LEVEL SHIFTERS

Channel

Control

VGH1

OUTx ToLCDPanel

VGL

INx

FLKx

FromTiming

Controller

TPS65192

SLVS962 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com

OUTPUT VOLTAGE DROP (LOW) vs OUTPUT CURRENT

Figure 17.

The 9 level shifter channels in the TPS65192 are divided into two groups. Channels 1 through 7 are powered

from VGH1 and VGL, channels 8 and 9 are powered from VGH2 and VGL. Channels 1 to 6 support gate shaping and

channels 7 through 9 do not (see the block diagram on page 1).

Figure 18 contains a simplified block diagram of one channel with gate voltage shaping.

Figure 18. Level Shifter Channel With Gate Voltage Shaping

On the rising edge of IN, Q1 turns on, Q2 and Q3 turn off, and OUT is driven to VGH1. On the falling edge of FLK,

Q1 turns off, Q3 is turned on, and the panel now discharges through Q3 and RE (see Figure 19). On the falling

edge of IN, Q2 turns on and Q3 turns off, and OUT is driven to VGL. This sequence is repeated in turn for each

channel.

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