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參數(shù)資料
| 型號： | LT1999IS8-50#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CURR SENSE HV 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 輸出類型： | 帶緩沖 |
| 轉(zhuǎn)換速率： | 3 V/µs |
| -3db帶寬： | 1.2MHz |
| 電流 - 輸入偏壓： | 137.5µA |
| 電壓 - 輸入偏移： | 500µV |
| 電流 - 電源： | 5.8mA |
| 電流 - 輸出 / 通道： | 40mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1999IS8-20#TRPBF | IC AMP CURR SENSE HV 8-SOIC |
| LT1999IS8-10#TRPBF | IC AMP CURR SENSE HV 8-SOIC |
| LT1999IMS8-50#TRPBF | IC AMP CURR SENSE HV 8-MSOP |
| 7030.3140 | FUSE 63MA 220VAC 5X20 SLOW |
| LT1999IMS8-20#TRPBF | IC AMP CURR SENSE HV 8-MSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1999MPMS8-10 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage, Bidirectional Current Sense Amplifier Low Power Shutdown <10μA |
| LT1999MPMS8-10#PBF | 功能描述:IC AMP CURR SENSE HV 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1999MPMS8-10#TRPBF | 功能描述:IC AMP CURR SENSE HV 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:150 系列:- 放大器類型:音頻 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:5 V/µs 增益帶寬積:12MHz -3db帶寬:- 電流 - 輸入偏壓:100nA 電壓 - 輸入偏移:500µV 電流 - 電源:6mA 電流 - 輸出 / 通道:50mA 電壓 - 電源，單路/雙路(±):4 V ~ 32 V，±2 V ~ 16 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件 |
| LT1999MPMS8-20 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage, Bidirectional Current Sense Amplifier Low Power Shutdown <10μA |
| LT1999MPMS8-20#PBF | 功能描述:IC AMP CURR SENSE HV 8-MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
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