BUF08630_14 Datasheet, PDF (10/35 Pages) Texas Instruments – Programmable Gamma-Voltage Generator and High Slew Rate VCOM

BUF08630
SBOS515A – OCTOBER 2010 – REVISED AUGUST 2012
Power-Down Sequence
When removing power from the BUF08630, the
reverse sequence from that described in the Power-
Up Sequence must be used. Figure 22 shows the
sequence that must be followed when V_COM-VS is
connected to V_S. Figure 23 shows the sequence that
must be followed when V_COM-VS is not connected to
V_S.
16
Digital Supply
V_S
V_SH
12
8
4
V_COM−VS is connected to V_S
0
0
2
4
6
8
Time (ms)
Figure 22. Shutdown Requirement with Two
Supplies
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16
Digital Supply
V_COM−VS
V_S
12
V_SH
8
4
0
0
2
4
6
8
Time (ms)
Figure 23. Shutdown Requirement with Three
Supplies
A separate supply pin is provided for V_COM-VS so that
separate supplies can be used for the gamma buffers
and V_COM. The gamma buffers could be powered with
a clean supply to prevent noise coupling into the
gamma channels. The V_COM amplifier can then be
supplied by a power source with more current
capability, but with higher noise.
It is highly recommended that a Schottky diode be
placed between V_S and V_SH, as shown in Figure 37.
10
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