JBT6K49-AS

2002-03-12

10

gggg-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.

The following table lists the voltages output from the VLC and /VLC pins and the corresponding levels on the

POL pin.

POL

VLC

/VLC

COMOUT

0

0

VSO

0

1

VSO

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.

V0

V1

V2

V3

V4

V5

Source driver

T6K47

/VLC

VLC

JBT6K49-AS

Fig.1 Example of a

CCCC-correction voltage circuit

t

/RST

/STB

1

ms <= t