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| 型号： | BUF20820AIDCPRE4 |
| 厂商： | Texas Instruments |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC 18CH PROG V-REF GEN 38-HTSSOP |
| 标准包装： | 2,000 |
| 应用： | TFT-LCD 面板：伽玛缓冲器，VCOM 驱动器 |
| 输出类型： | 满摆幅 |
| 电路数： | 18 |
| 电流 - 电源： | 18mA |
| 电流 - 输出 / 通道： | 100mA |
| 电压 - 电源，单路/双路(±)： | 7 V ~ 18 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-TFSOP （0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 38-HTSSOP |
| 包装： | 带卷 (TR) |
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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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相关代理商/技术参数 |
参数描述 |
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| BUF20820EVM | 功能描述:放大器 IC 开发工具 BUF20800-BUF20820 Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| BUF22821 | 制造商:TI 制造商全称:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory |
| BUF22821AIDCPR | 功能描述:LCD Gamma缓冲器 Prgrmbl Gam-Vltg Gen & Vcom Calibrator RoHS:否 制造商:Maxim Integrated 输入补偿电压: 转换速度: 电源电压-最大:20 V 电源电压-最小:9 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-38 封装:Tube |
| BUF22821EVM | 功能描述:放大器 IC 开发工具 BUF22821EVM Eval Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
| BUF22821EVM-USB | 功能描述:放大器 IC 开发工具 BUF22821 Eval board Mod RoHS:否 制造商:International Rectifier 产品:Demonstration Boards 类型:Power Amplifiers 工具用于评估:IR4302 工作电源电压:13 V to 23 V |
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