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| 型号： | LT1999CMS8-10#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURR SENSE HV 8-MSOP |
| 标准包装： | 2,500 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| 输出类型： | 带缓冲 |
| 转换速率： | 3 V/µs |
| -3db带宽： | 2MHz |
| 电流 - 输入偏压： | 137.5µA |
| 电压 - 输入偏移： | 500µV |
| 电流 - 电源： | 5.8mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
LT1999-10/LT1999-20/
LT1999-50
17
1999fb
applicaTions inForMaTion
The REF pin should be either driven by a low source im-
pedance (<100Ω) or should be bypassed with at least 1nF
to a low impedance, low noise, signal ground plane (see
Figure 4). Larger bypass capacitors on both V+ pins, and
the REF pin, will extend enhanced AC CMRR, and PSRR
performance to lower frequencies. Bypassing the REF pin
to a quiet ground plane filters the V+ pin or GND pin noise
that is sensed by the REF pin voltage divider and applied
to the noninverting input of output amplifier AO. Any com-
mon IR drops generated by pulsating ground currents in
common with the REF pin filter capacitor can compromise
the filtering performance and should be avoided.
If the SHDN pin is not driven and is left floating, routing
a PCB trace connecting Pins 1 and 8 under the part will
act as a shield, and will help limit edge coupling from the
inputs (Pins 2 and 3) to the SHDN pin. Periodic pulses on
the inputs with fast edges may glitch the high impedance
SHDN pin, periodically putting the part into low power
shutdown.Additionalprecautionagainstthismaybetaken
by adding an optional small (~10pF) capacitor may be tied
between V+ (Pin 1) and Pin 8.
Finally, when connecting the LT1999 inputs to the sense
resistor,itisimportanttousegoodKelvinsensingpractices
(sensing the resistor in a way that excludes PCB trace
IR voltage drops). For sense resistors less than 1Ω, one
might consider using a 4-wire sense resistor to sense the
resistive element accurately.
Selection of the Current Sense Resistor
The external sense resistor selection presents a delicate
trade-off between power dissipation in the resistor and
current measurement accuracy.
In high current applications, the user may want to mini-
mize the power dissipated in the sense resistor. The sense
resistorcurrentwillcreateheatandvoltageloss,degrading
efficiency. Asaresult,thesenseresistorshouldbeassmall
as possible while still providing adequate dynamic range
required by the measurement. The dynamic range is the
ratio between the maximum accurately produced signal
generated by the voltage across the sense resistor, and
the minimum accurately reproduced signal. The minimum
accurately reproduced signal is primarily dictated by the
voltage offset of the LT1999. The maximum accurately
reproduced signal is dictated by the output swing of the
LT1999.
Thus the dynamic range for the LT1999 can be thought of
the maximum sense voltage divided by the input referred
voltage offset or:
Dynamic Range
=
VOUT(MAX)
GAIN VOSI
The above equation tells us that the dynamic range is
inversely proportional to the gain of the LT1999. Thus,
if accuracy is of greater importance than efficiency or
power loss, the LT1999-10 used with the highest valued
sense resistor possible is recommended. If efficiency,
heat generated, and power loss in the resistive shunt is
the primary concern, the LT1999-50 and the lowest value
sense resistor possible is recommended. The LT1999-20
is available for applications somewhere in between these
two extremes.
相关PDF资料 |
PDF描述 |
|---|---|
| LT1999CS8-50#TRPBF | IC AMP CURR SENSE HV 8-SOIC |
| LT1999CS8-20#TRPBF | IC AMP CURR SENSE HV 8-SOIC |
| 0031.8568 | FUSE 3.15A 250VAC 5X20 FAST |
| 0034.1737 | FUSE 125MA 250V 6.3X32 FAST GLSS |
| 0001.1026 | FUSE 1.6A 250V 6.3X32 FAST-ACT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1999CMS8-20 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage, Bidirectional Current Sense Amplifier Low Power Shutdown <10μA |
| LT1999CMS8-20#PBF | 功能描述:IC OP AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| LT1999CMS8-20#TRPBF | 功能描述:IC AMP CURR SENSE HV 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LT1999CMS8-50#PBF | 功能描述:IC OP AMP CURRENT SENSE 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| LT1999CMS8-50#TRPBF | 功能描述:IC AMP CURR SENSE HV 8-MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
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