参数资料
| 型号： | BD8157EFV-E2 |
| 厂商： | Rohm Semiconductor |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUP 1-CH HTSSOP-B20 |
| 标准包装： | 2,500 |
| 应用： | TFT-LCD 面板：伽玛缓冲器，VCOM 驱动器 |
| 电流 - 电源： | 1.2mA |
| 电源电压： | 2.1 V ~ 4 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 20-HTSSOP-B |
| 包装： | 带卷 (TR) |
BD8151EFV, BD8157EFV
Technical Note
(10) Using the buffer amp and VCOM
The 4-channel buffer amp and 1-channel VCOM output are used to generate the gamma compensation voltage that is
input to the source driver. The VS pin serves as the power supply for the buffer amp and VCOM.
VS
V COMIN
V IN 1
VCOM voltage output
V1
V IN 2
V IN 3
V IN 4
V2
V3
V4
For gamma correction
Gamma correction voltage output
Fig. 36 Example Buffer Amp Circuit
Use caution as the gamma correction buffer amp and VCOM have different output current capacities. A range from I/O
power supply to ground potentials can be set for the built-in buffer amplifier. If output voltage noise becomes problematic,
insert a 0.1 μF capacitor in the output circuit. A capacitance value of 0 pF to 1 μF is recommended for this capacitor. Large
capacitance values of 1 μF or larger may cause back current to flow through internal parasitic diodes in the event of a
supply voltage ground fault, causing damage to internal IC elements. For applications where such modes are anticipated,
implement a bypass diode or other preventive measure.
Wait for trigger
Vs
V1
V2
V3
V4
Fig. 37 Gamma Correction Voltage Startup Waveform
www.rohm.com
? 2009 ROHM Co., Ltd. All rights reserved.
12/17
2009.07 - Rev.B
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