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參數(shù)資料
| 型號： | MAX9611AUB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 0K |
| 描述： | IC 12BIT ADC OPAMP COMPAR 10UMAX |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 增益帶寬積： | 2.5MHz |
| -3db帶寬： | 4MHz |
| 電流 - 輸入偏壓： | 1µA |
| 電壓 - 輸入偏移： | 100µV |
| 電流 - 電源： | 1.6mA |
| 電流 - 輸出 / 通道： | 15mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | * |
| 封裝/外殼： | * |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | * |
High-Side, Current-Sense Amplifiers with
12-Bit ADC and Op Amp/Comparator
MAX9611/MAX9612
______________________________________________________________________________________ 17
Power-On Reset
The MAX9611/MAX9612 include power-on reset cir-
cuitry that ensures all registers reset to a known state on
power-up. Once VCC goes above 2.4V, the POR circuit
releases the registers for normal operation.
Applications Information
Inrush Current Limiter
The MAX9611 can be used as an inrush current limiter
for a number of applications as shown in Figure 3. Note
that the sense resistor can be placed on either side of
the pFET. Since the input common-mode voltage of the
MAX9611 extends to ground, the sense resistor can be
placed at the load side as well, allowing current to be
sensed even when there is a dead-short on the load.
The inrush current limiting circuit reads and measures
the load-current during normal operation and can limit
the load current to a user-set value. In normal operation,
the load current is below the set threshold. The pFET
is fully turned on because the op-amp output is at 0V.
In the event of an overcurrent situation at the load, the
op-amp controls the pFET’s gate-voltage so it transitions
to a linear region, thus limiting the load current. In this
case, the op-amp output voltage is between 0V and
VBAT, as required for current-limiting.
Choose a suitable sense resistor and a low RDS-on pFET to
ensure the best efficiency during normal operation. Choose
a pFET with large power dissipation to ensure compliance
with safe operating area of the pFET. The MAX9611 comes
equipped with a variety of watchdog options to help with
this design (see Control Register 2, Table 7).
Choose resistor values R1 and R2 to ensure that the
pFET is fully on in normal operating conditions and to
ensure that the VGS maximum rating is not exceeded.
Also, R1 and R2 help limit the current in the open-drain
output stage of the internal op amp. RCOMP and CCOMP
help roll-off high-frequency gain of the feedback control
system. R2 and CCOMP set a pole, for which 10kHz is a
good choice. RCOMP and CCOMP set a zero, for which
100kHz is a good choice.
With the internal gain of the current-sense amplifier
(2.5V/V), the inrush current-limit threshold can be set
using resistor-divider R3 and R4 as follows:
(
)
(
)
×
=
+×
CC
LIMIT
SENSE
V
R3
I
R2 R3 2.5 R
Note: The inrush current limiter can be changed to a
high-side relay-disconnect circuit by using the MAX9611
set to comparator mode (MODE 111).
Figure 3. Inrush Current Limiter
MAX9611
0.1F
R4
R1
R2
CCOMP
VBAT
RCOMP
R3
0.1F
1F
VCC
I2C CLOCK
INPUT
I2C DATA
INPUT/OUTPUT
RS+
RS-
A0
A1
SCL
SDA
OUT
SET
2.7V TO 5.5V
GND
LOAD
RSENSE
P
(OUTPUT SET TO OP-AMP MODE)
INRUSH CURRENT LIMITER
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參數(shù)描述 |
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| MAX9611EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX9611 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9611PMB1# | 功能描述:放大器 IC 開發(fā)工具 MAX9611 Peripheral Module RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9612AUB+ | 功能描述:電流靈敏放大器 iSense + ADC + I2C 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 |
| MAX9612AUB+T | 功能描述:電流靈敏放大器 iSense + ADC + I2C 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 |
| MAX9613AXT+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:RAIL-RAIL PRECISION 3MHZ OP AMP - Rail/Tube |
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