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參數(shù)資料
| 型號(hào)： | MAX4172ESA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP PREC CURRENT-SENSE 8-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 放大器類型： | 電流檢測(cè) |
| 電路數(shù)： | 1 |
| -3db帶寬： | 800kHz |
| 電流 - 輸入偏壓： | 50µA |
| 電壓 - 輸入偏移： | 1000µV |
| 電流 - 電源： | 800µA |
| 電流 - 輸出 / 通道： | 1.75mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 32 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-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1388 (CN2011-ZH PDF) |
MAX4172
Low-Cost, Precision, High-Side
Current-Sense Amplifier
6
Maxim Integrated
flows through RG1, IRG1 x RG1 = ILOAD x RSENSE. The
internal current mirror multiplies IRG1 by a factor of 50
to give IOUT = 50 x IRG1. Substituting IOUT/50 for IRG1,
(IOUT/50) x RG1 = ILOAD x RSENSE, or:
IOUT = 50 x ILOAD x (RSENSE/RG1)
The internal current gain of 50 and the factory-trimmed
resistor RG1 combine to result in the MAX4172
transconductance (Gm) of 10mA/V. Gm is de-
fined as being equal to IOUT/(VRS+ - VRS-). Since (VRS+
- VRS-) = ILOAD x RSENSE, the output current (IOUT) can
be calculated with the following formula:
IOUT = Gm x (VRS+ - VRS-) =
(10mA/V) x (ILOAD x RSENSE)
Current Output
The output voltage equation for the MAX4172 is given
below:
VOUT = (Gm) x (RSENSE x ROUT x ILOAD)
where VOUT = the desired full-scale output voltage,
ILOAD = the full-scale current being sensed, RSENSE =
the current-sense resistor, ROUT = the voltage-setting
resistor, and Gm = MAX4172 transconductance
(10mA/V).
The full-scale output voltage range can be set by
changing the ROUT resistor value, but the output volt-
age must be no greater than V+ - 1.2V. The above
equation can be modified to determine the ROUT
required for a particular full-scale range:
ROUT = (VOUT)/(ILOAD x RSENSE x Gm)
OUT is a high-impedance current source that can be
integrated by connecting it to a capacitive load.
PG Output
The PG output is an open-collector logic output that
indicates the status of the MAX4172’s V+ power sup-
ply. A logic low on the PG output indicates that V+ is
sufficient to power the MAX4172. This level is tempera-
ture dependent (see
Typical Operating Characteristics
graphs), and is typically 2.7V at room temperature. The
internal PG comparator has a 100mV (typical) hystere-
sis to prevent possible oscillations caused by repeated
toggling of the PG output, making the device ideal for
power-management systems lacking soft-start capabili-
ty. An internal delay (15s typical) in the PG compara-
tor allows adequate time for power-on transients to
settle out. The PG status indicator greatly simplifies the
design of closed-loop systems by ensuring that the
components in the control loop have sufficient voltage
to operate correctly.
__________Applications Information
Suggested Component Values
for Various Applications
The
Typical Operating Circuit is useful in a wide variety
of applications. Table 1 shows suggested component
values and indicates the resulting scale factors for vari-
ous applications required to sense currents from
100mA to 10A.
Adjust the RSENSE value to monitor higher or lower cur-
rent levels. Select RSENSE using the guidelines and for-
mulas in the following section.
Sense Resistor, RSENSE
Choose RSENSE based on the following criteria:
Voltage Loss: A high RSENSE value causes the
power-source voltage to degrade through IR loss.
For minimal voltage loss, use the lowest RSENSE
value.
RG1
RS+
RSENSE
INPUT
RG2
TO LOAD/
BATTERY
RS-
VSENSE
A1
1:50
CURRENT
MIRROR
MAX4172
OUT
VTH
IOUT = 50 IRG1
IRG1
Q1
V+
PG
V+
GND
ILOAD
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4172ESA+ | 功能描述:電流靈敏放大器 Precision High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX4172ESA+T | 功能描述:電流靈敏放大器 Precision High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX4172ESA-T | 功能描述:電流靈敏放大器 Precision High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX4172EUA | 功能描述:電流靈敏放大器 Precision High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX4172EUA+ | 功能描述:電流靈敏放大器 Precision High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
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