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參數(shù)資料
| 型號： | MAX4081SASA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 76V, High-Side, Current-Sense Amplifiers with Voltage Output |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 410K |
| 代理商： | MAX4081SASA |
M
The full-scale output voltage is V
OUT
= R
SENSE
I
LOAD
(MAX)
A
V
, for the MAX4080 and V
OUT
= V
REF
±
R
SENSE
V
SENSE(MAX)
is 1000mV for the 5V/V gain version,
250mV for the 20V/V gain version, and 100mV for the
60V/V gain version.
I
LOAD(MAX)
A
V
for the MAX4081.
Choosing the Sense Resistor
Choose R
SENSE
based on the following criteria:
Voltage Loss:
A high R
SENSE
value causes the
power-source voltage to degrade through IR loss. For
minimal voltage loss, use the lowest R
SENSE
value.
Accuracy:
A high R
SENSE
value allows lower cur-
rents to be measured more accurately. This is due to
offsets becoming less significant when the sense
voltage is larger. For best performance, select
R
SENSE
to provide approximately 1000mV (gain of
5V/V), 250mV (gain of 20V/V), or 100mV (gain of
60V/V) of sense voltage for the full-scale current in
each application.
Efficiency and Power Dissipation:
At high current
levels, the I
2
R losses in R
SENSE
can be significant.
Take this into consideration when choosing the
resistor value and its power dissipation (wattage)
rating. Also, the sense resistor
’
s value might drift if it
is allowed to heat up excessively.
Inductance:
Keep inductance low if I
SENSE
has a
large high-frequency component. Wire-wound resis-
tors have the highest inductance, while metal film is
somewhat better. Low-inductance, metal-film resis-
tors are also available. Instead of being spiral-
wrapped around a core, as in metal-film or wire-
wound resistors, they are a straight band of metal
and are available in values under 1
.
Because of the high currents that flow through R
SENSE
,
take care to eliminate parasitic trace resistance from
causing errors in the sense voltage. Either use a four-
terminal current-sense resistor or use Kelvin (force and
sense) PC board layout techniques.
Dynamic Range Consideration
Although the MAX4081 have fully symmetrical bidirec-
tional V
SENSE
input capability, the output voltage range
is usually higher from REF to V
CC
and lower from REF
to GND (unless the supply voltage is at the lowest end
of the operating range). Therefore, the user must con-
sider the dynamic range of current monitored in both
directions and choose the supply voltage and the refer-
ence voltage (REF) to make sure the output swing
above and below REF is adequate to handle the swings
without clipping or running out of headroom.
Power-Supply Bypassing and Grounding
For most applications, bypass V
CC
to GND with a 0.1μF
ceramic capacitor. In many applications, V
CC
can be
connected to one of the current monitor terminals (RS+
or RS-). Because V
CC
is independent of the monitored
voltage, V
CC
can be connected to a separate regulated
supply.
If V
CC
will be subject to fast-line transients, a series
resistor can be added to the power-supply line of the
MAX4080/MAX4081 to minimize output disturbance.
This resistance and the decoupling capacitor reduce
the rise time of the transient. For most applications, 1k
in conjunction with a 0.1μF bypass capacitor work well.
The MAX4080/MAX4081 require no special considera-
tions with respect to layout or grounding. Consideration
should be given to minimizing errors due to the large
charge and discharge currents in the system.
76V, High-Side, Current-Sense Amplifiers with
Voltage Output
12
______________________________________________________________________________________
MAX4081
R
SENSE
I
LOAD
= 0
LOAD
V
CC
GND
RS-
RS+
OUT
REF1A
REF1B
5V
5V
10V
MAX4081
R
SENSE
I
LOAD
= 0
LOAD
V
CC
GND
RS-
RS+
OUT
REF1A
REF1B
5V
Figure 4. MAX4081 Reference Inputs
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4081SASA+ | 功能描述:電流靈敏放大器 76V High-Side Crnt Sense Amp w/V Out 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 |
| MAX4081SASA+T | 功能描述:電流靈敏放大器 76V High-Side Crnt Sense Amp w/V Out 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 |
| MAX4081SASA-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(bǔ)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 |
| MAX4081SAUA | 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(bǔ)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 |
| MAX4081SAUA+ | 功能描述:電流靈敏放大器 76V High-Side Crnt Sense Amp w/V Out 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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