JBT6K49-AS Datasheet, PDF (10/14 Pages) Toshiba Semiconductor – Power supply IC for TFT LCD Panels

JBT6K49-AS
g-Correction Reference Voltage
The +4.8 V generated by DC-DC converter (1) is used to generate g-correction reference voltages used by the
source driver (T6K47). The voltages generated serve as the maximum and minimum g-correction voltages.
These two voltage levels are switched by the signal input on the POL pin, allowing the g-correction voltage
circuit to be configured easily. Fig.1 is an example of a g-correction voltage circuit.
/VLC
JBT6K49-AS
VLC
V0
V1
Source driver
V2
V3 ^T6K47
V4
V5
Fig.1 Example of a C-correction voltage circuit
The following table lists the voltages output from the VLC and /VLC pins and the corresponding levels on the
POL pin.
POL
0
1
VLC
0
VSO
/VLC
VSO
0
COMOUT
0
VSO
Power-on
The JBT6K49-AS incorporates a trimming circuit designed to increase the precision of the LCD-driving
output voltage. After the power is turned on, the trimming circuit is reset on the leading edge of the signal input
on the reset pin. Use the following /RST pin processing sequence after power-on.
V_DD/V_BAT
/RST
t
/STB
1 ms ^<= t
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2002-03-12