SL20T0081 System Logic Semiconductor, SL20T0081 Datasheet - Page 28

• Manufacturer Part Number: SL20T0081
• Description: SLS System Logic Semiconductor
• Manufacturer: System Logic Semiconductor

SLS System Logic Semiconductor
Voltage Follower Circuits
converted by the Voltage Follower for increasing drive capability. The following table shows the relationship between
V1 to V level and each duty ratio.
Table 13. The Relationship between V1 to V4 Level and Duty Ratio
High Power Mode
HPMB = “H”). If use for LCD panels with large loads, this low-power power supply may cause display quality to
degrade. When this occurs, setting the HPMB pin to “L” (high power mode) can improve the quality of the display.
Moreover, if the quality of display is inadequate even after high power mode has been set, then it is necessary to add
a liquid crystal drive power supply externally ( VOUT or V0 or V1, V2, V3, V4 ).
VLCD voltage (V0) is resistively divided into four voltage levels (V1, V2, V3, V4), and those output impedance are
The power supply circuit equipped in the SL20T0081 for LCD drive has very low power consumption (in normal mode:
Duty ratio
1 / 81
1 / 65
1 / 55
1 / 49
1 / 33
DUTY2
H
H
L
L
L
L
DUTY1
H
L
L
L
L
L
DUTY0
H
H
H
H
H
L
LCD bias
1/10
1/8
1/7
1/9
1/6
1/8
1/6
1/8
1/5
1/6
(9/10) x V0
(7/8) x V0
(6/7) x V0
(8/9) x V0
(5/6) x V0
(5/6) x V0
(4/5) x V0
(7/8) xV0
(7/8) xV0
(5/6) xV0
V1
(8/10) x V0
(6/8) x V0
(5/7) x V0
(7/9) x V0
(4/6) x V0
(6/8) x V0
(4/6) x V0
(6/8) x V0
(3/5) x V0
(5/6) x V0
V2
(2/10) x V0
(2/8) x V0
(2/7) x V0
(2/9) x V0
(2/6) x V0
(2/8) x V0
(2/6) x V0
(2/8) x V0
(2/5) x V0
(2/6) x V0
V3
SL20T0081
(1/10) x V0
(1/8) x V0
(1/7) x V0
(1/9) x V0
(1/6) x V0
(1/8) x V0
(1/6) x V0
(1/8) x V0
(1/5) x V0
(1/6) x V0
V4