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| 型号： | LT1254CS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/8页 |
| 文件大小： | 0K |
| 描述： | IC AMP VIDEO LOWCOST QUAD 14SOIC |
| 标准包装： | 2,500 |
| 应用： | 电流反馈 |
| 电路数： | 4 |
| -3db带宽： | 270MHz |
| 转换速率： | 250 V/µs |
| 电流 - 电源： | 6mA |
| 电流 - 输出 / 通道： | 55mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 28 V，±2 V ~ 14 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
6
LT1253/LT1254
Transient Response
LT1253/54 TPC16
Transient Response
VS = ±5V
AV = 1
RL = 150
LT1253/54 TPC17
RF = 562
RG = 61.9
VO = 1.5V
VS = ±5V
AV = 10
RL = 150
RF = 787
VO = 1V
Power Dissipation
The LT1253/LT1254 amplifiers combine high speed and
large output current drive into very small packages. Be-
cause these amplifiers work over a very wide supply range,
it is possible to exceed the maximum junction temperature
under certain conditions. To insure that the LT1253/
LT1254 are used properly, we must calculate the worst
case power dissipation, define the maximum ambient
temperature, select the appropriate package and then
calculate the maximum junction temperature.
The worst case amplifier power dissipation is the total of
the quiescent current times the total power supply voltage
plus the power in the IC due to the load. The quiescent
supply current of the LT1253/LT1254 has a strong nega-
tive temperature coefficient. The supply current of each
amplifier at 150
°C is less than 7mA and typically is only
4.5mA. The power in the IC due to the load is a function of
the output voltage, the supply voltage and load resistance.
The worst case occurs when the output voltage is at half
supply, if it can go that far, or its maximum value if it
cannot reach half supply.
For example, let’s calculate the worst case power dissipa-
tion in a video cable driver operating on a
±12V supply that
delivers a maximum of 2V into 150
.
PDMAX = 2 × VS × ISMAX + (VS – VOMAX) × VOMAX/RL
PDMAX = 2 × 12V × 7mA + (12V – 2V) × 2V/150
= 0.168 + 0.133 = 0.301 Watt per Amp
Now if that is the dual LT1253, the total power in the
package is twice that, or 0.602W. We now must calculate
how much the die temperature will rise above the ambient.
The total power dissipation times the thermal resistance of
the package gives the amount of temperature rise. For the
above example, if we use the S8 surface mount package,
the thermal resistance is 150
°C/W junction to ambient in
still air.
Temperature Rise = PDMAX × RθJA = 0.602W
× 150°C/W = 90.3°C
The maximum junction temperature allowed in the plastic
package is 150
°C. Therefore the maximum ambient al-
lowed is the maximum junction temperature less the
temperature rise.
Maximum Ambient = 150
°C – 90.3°C = 59.7°C
Note that this is less than the maximum of 70
°C that is
specified in the absolute maximum data listing. In order to
use this package at the maximum ambient we must lower
the supply voltage or reduce the output swing.
APPLICATIO S I FOR ATIO
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1256 | 制造商:LINER 制造商全称:Linear Technology 功能描述:40MHz Video Fader and DC Gain Controlled Amplifier |
| LT1256CN | 功能描述:IC AMP VIDEO FADE CONTRLD 14-DIP RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LT1256CN#PBF | 功能描述:IC AMP VIDEO FADE CONTRLD 14-DIP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| LT1256CS | 功能描述:IC AMP VIDEO FADE CONTRLD 14SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
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