TPS65163
SLVSA28 –OCTOBER 2009
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Undervoltage Lockout
An undervoltage lockout function inhibits the device if the supply voltage VIN is below the minimum needed for
proper operation.
Thermal Shutdown
A thermal shutdown function automatically disables all LCD bias functions if the device junction temperature
exceeds ≈150°C. The device automatically starts operating again once it has cooled down to ≈140°C.
Level Shifters and Gate Shaping
The nine level-shifter channels in the TPS65163 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. Figure 51 contains a simplified block diagram of one channel with gate voltage
shaping.
VGH1
INX
Q1
Q2
From Timing
Controller
To LCD panel
Channel
Control
OUTX
FLKX
Q3
RE
RE
VGL
Figure 51. 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 52). 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.
VLOGIC
INX
GND
VLOGIC
FLKX
GND
VGH1
OUTX
VGL
Gate shaping starts on
falling edge of FLKX
Gate shaping stops on
falling edge of INX
Figure 52. Gate Voltage Shaping Timing Diagram
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