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| 型号： | BUF20820EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | EVAL MOUDLE FOR BUF20820 |
| 标准包装： | 1 |
| 系列： | * |
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BUF20820
SBOS330E DECEMBER 2005 REVISED OCTOBER 2008
www.ti.com
24
OUTPUT PROTECTION
The BUF20820 output stages can safely source and sink
the current levels indicated in Figure 4. However,
precautions must be taken in certain situations in order to
prevent the output stages from being damaged by
excessive current flow. The outputs (OUT1-18, VCOM OUT1
and VCOM OUT2) include ESD protection diodes, as shown
in Figure 22. Normally, these diodes do not conduct and
are passive during typical device operation. Under certain
operating conditions where the diodes may conduct, they
can be subjected to high or even damaging current levels.
These conditions are most likely to occur when a voltage
applied to an output exceeds VS + 0.5V, or drops below
GND 0.5V.
One common scenario where these conditions can occur
is when the output pin is connected to a sufficiently large
capacitor, and the BUF20820 power-supply source (VS) is
suddenly removed. Removing the power-supply source
allows
the
capacitor
to
discharge
through
the
current-steering diodes. The energy released during the
high current flow period causes the power dissipation
limits of the diode to be exceeded. Protection against this
high
current
flow
may
be
provided
by
placing
current-limiting resistors in series with the output, as
shown in Figure 8. Select a resistor value that restricts the
current level to the maximum rating for the particular pin.
V
S
OUTX
or
V
COMX
ESD Current
Steering Diodes
BUF20820
Figure 22. Output Pins ESD Protection
Current-Steering Diodes
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