Datasheet

MAX17103/AUO-P1721.14
The CK and XCK inputs are normally configured to
drive the CKH and XCKH outputs complementary as
shown in Figure 5. The CS input is normally configured
to be driven low for a period of time that overlaps the
CK and XCK input transitions. While CS is low, the CKH
and XCKH outputs are high impedance and the internal
charge-sharing switch (SW
CS
) is closed such that
charge is transferred from one load capacitance to the
other load capacitance through an external resistor
connected between QS and XCKH (see Figure 4). This
transfer of charge allows CKH and XCKH to complete
part of their transitions between the VGL and GHON
power rails without drawing power from the power rails
during this portion of the transition. This reduces the
total power required from GHON and VGL to complete
the remainder of the outputs’ transitions.
DC-DC Converter with Integrated Scan Driver,
VGL Controller, Op Amp, and LDO for TFT LCD
20 ______________________________________________________________________________________
CK
XCK
CS
0
0
0
CKH
XCKH
V
VGL
V
GHON
V
VGL
V
GHON
0
Figure 5. Scan Driver System Timing Utilizing Charge Sharing Between the CKH and XCKH Outputs