- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄3281 > MAX471EPA (Maxim Integrated Products)IC AMP CURRNT-SNS HI-SIDE 8-DIP PDF資料下載
參數(shù)資料
| 型號： | MAX471EPA |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP CURRNT-SNS HI-SIDE 8-DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 電流 - 電源： | 50µA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 36 V |
| 工作溫度： | -40°C ~ 85°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 |
Peak Sense Current
The MAX471’s maximum sense current is 3ARMS. For
power-up, fault conditions, or other infrequent events,
larger peak currents are allowed, provided they are
short—that is, within a safe operating region, as shown
in Figure 5.
MAX472
RSENSE, RG1, and RG2 are externally connected on
the MAX472. VCC can be connected to either the
load/charge or power-source/battery side of the sense
resistor. Connect VCC to the load/charge side of
RSENSE if you want to include the MAX472 current drain
in the measured current.
Suggested Component Values
for Various Applications
The general circuit of Figure 4 is useful in a wide variety
of applications. It can be used for high-current applica-
tions (greater than 3A), and also for those where the full-
scale load current is less than the 3A of the MAX471.
Table 1 shows suggested component values and indi-
cates the resulting scale factors for various applications
required to sense currents from 100mA to 10A.
Higher or lower sense-current circuits can also be built.
Select components and calculate circuit errors using
the guidelines and formulas in the following section.
RSENSE
Choose RSENSE based on the following criteria:
a) Voltage Loss: A high RSENSE value will cause the
power-source voltage to degrade through IR loss.
For least voltage loss, use the lowest RSENSE value.
b) Accuracy: A high RSENSE value allows lower
currents to be measured more accurately. This is
because offsets become less significant when the
sense voltage is larger.
c) Efficiency and Power Dissipation: At high current
levels, the I2R losses in RSENSE may be significant.
Take this into consideration when choosing the
resistor value and power dissipation (wattage) rat-
ing. Also, if the sense resistor is allowed to heat up
excessively, its value may drift.
d) Inductance: If there is a large high-frequency com-
ponent to ISENSE, you will want to keep inductance
low. Wire-wound resistors have the highest induc-
tance, while metal film is somewhat better. Low-
inductance metal-film resistors are available. Instead
of being spiral wrapped around a core, as in metal-
film or wire-wound resistors, these are a straight
band of metal. They are made in values under 1
.
e) Cost: If the cost of RSENSE becomes an issue, you
may want to use an alternative solution, as shown in
Figure 6. This solution uses the PC board traces to
create a sense resistor. Because of the inaccuracies
of the copper “resistor,” you will need to adjust the
full-scale current value with a potentiometer. Also,
the resistance temperature coefficient of copper is
fairly high (approximately 0.4%/°C), so systems that
experience a wide temperature variance should take
this into account.
MAX471/MAX472
Precision, High-Side
Current-Sense Amplifiers
_______________________________________________________________________________________
9
Table 1. Suggested Component Values for the MAX472
FULL-SCALE
LOAD
CURRENT,
ISENSE (A)
CURRENT-
SENSE
RESISTOR,
RSENSE
(m
)
GAIN-SETTING
RESISTORS,
RG1 = RG2
(
)
OUTPUT
RESISTOR,
ROUT
(k
)
FULL-SCALE
OUTPUT
VOLTAGE,
VOUT (V)
SCALE
FACTOR,
VOUT/ISENSE
(V/A)
0.1
500
200
10
2.5
25
1
50
200
10
2.5
5
10
100
5
2.5
0.5
10
5
50
2
0.2
0.9
1.1
1.6
14
2.5
14
2.5
13
2.0
12
2.0
TYPICAL ERROR AT X%
OF FULL LOAD (%)
1%
100%
10%
50
45
0
10
5
40
PULSE WIDTH (sec)
DIP safe
operating region
Small Outline safe
operating region
SENSE
CURRENT
(A)
100
1m
10m
30
35
15
20
25
10
DIP
fuse
time
Small
Outline
fuse
time
TA = +25°C
Figure 5. MAX471 Pulse Current Safe Operation for 10,000
Pulses and Fuse Time for Continuous Current. Pulse tests done
with 250mW average power dissipation.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| RMCF2010JT3K30 | RES 3.3K OHM 3/4W 5% 2010 SMD |
| RMCF2010JT2K70 | RES 2.7K OHM 3/4W 5% 2010 SMD |
| 0459851153 | CONN HEADER 10PWR 28SGL 1.57MM |
| 0459851152 | CONN HEADER 10PWR 28SGL 2.36MM |
| 0459851151 | CONN HEADER 10PWR 28SGL 3.18MM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX471ESA | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX471ESA+ | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX471ESA+T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX471ESA-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX4720ELT+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。