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參數(shù)資料
| 型號(hào)： | MAX4374HESD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | SO-14 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 366K |
| 代理商： | MAX4374HESD |
M
Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs
10
______________________________________________________________________________________
the
Electrical Characteristics
and
Typical Operating
Characteristics
.
Internal Comparator(s)
The MAX4373/MAX4374/MAX4375 contain a latching
output comparator. The negative terminal of the com-
parator is internally connected to the internal reference.
The positive terminal is accessible at CIN1. When
RESET
is high, the comparator output latches high
once the comparator threshold is exceeded. When
RESET
is low, the latch is transparent.
The MAX4374 and MAX4375 each contain an addition-
al comparator for use in window detection. The nega-
tive terminal of the MAX4374 and the positive terminal
of the MAX4375 are internally connected to the internal
reference. The positive terminal of the MAX4374 and
the negative terminal of the MAX4375 are accessible at
CIN2.
___________Applications Information
Recommended Component Values
Ideally, the maximum load current will develop the full-
scale sense voltage across the current-sense resistor.
Choose the gain version needed to yield the maximum
output voltage required for the application:
where V
SENSE
is the full-scale sense voltage, 150mV for
gains of +20V/V and +50V/V or 100mV for a gain of
+100V/V. A
V
is the gain of the device. The minimum
supply voltage is V
OUT
+ 0.25V. Note that the output for
the gain of +100V/V is internally clamped at 12V.
Calculate the maximum value for R
SENSE
so that the
differential voltage across RS+ and RS- does not
exceed the full-scale sense voltage:
Choose the highest value resistance possible to maxi-
mize V
SENSE
and thus minimize total output error.
In applications monitoring high current, ensure that
R
SENSE
is able to dissipate its own I
2
R loss. If the resis-
tor’s power dissipation is exceeded, its value may drift
or it may fail altogether, causing a differential voltage
across the terminals in excess of the absolute maxi-
mum ratings. Use resistors specified for current-sens-
ing applications.
Overcurrent Protection Circuit
The overcurrent protection circuit, shown in Figure 2,
uses the MAX4373 to control an external P-channel
MOSFET. The MOSFET controlled by the MAX4373
opens the current path under overload conditions. The
latched output of the MAX4373’s comparator prevents
the circuit from oscillating, and the pushbutton resets
the current path after an overcurrent condition.
Window Detection Circuit
Figure 3 shows a simple circuit suitable for window
detection. Let I
OVER
be the minimum load current
(I
LOAD
) required to cause a low state at COUT2, and let
I
UNDER
be the maximum load current required to cause
a high state at COUT1:
where A
V
is the gain of the device and V
REF
is the inter-
nal reference voltage (0.6V typ).
Connect COUT1 and COUT2; the resulting comparator
output will be high when the current is inside the cur-
rent window and low when the current is outside the
window. The window is defined as load currents less
than I
OVER
and greater than I
UNDER
.
RS-
RS+
OUT
CIN1
LOAD
MAX4373
GND
COUT1
RESET
PUSHBUTTON
V
CC
2.7V TO 5.5V
Figure 2. MAX4373 Overcurrent Protection Circuit
V
V
A
OUT
SENSE
V
=
×
R
V
I
SENSE MAX
LOAD
SENSE MAX
(
)
(
)
=
R
R
I
V
R
A
R
R
and
I
V
R
A
R
R
UNDER
REF
SENSE
V
OVER
REF
SENSE
V
=
+
=
+
×
×
4
5
5
1
2
2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4375FESD | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4375FEUB | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4375HESD | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4375HEUB | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
| MAX4373TEUA | Low-Cost, Micropower, High-Side Current-Sense Amplifier Comparator Reference ICs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4374HESD+ | 功能描述:電流靈敏放大器 uPower 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 |
| MAX4374HESD+T | 功能描述:電流靈敏放大器 uPower 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 |
| MAX4374HESD-T | 功能描述:電流靈敏放大器 uPower 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 |
| MAX4374HEUB | 功能描述:電流靈敏放大器 uPower 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 |
| MAX4374HEUB+ | 功能描述:電流靈敏放大器 uPower 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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