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| 型號： | ISL28006FHADJZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 11/26頁 |
| 文件大小： | 0K |
| 描述： | IC AMP CS R-R LP SOT23-6 |
| 應(yīng)用說明： | ISL28005/06 Application Note |
| 產(chǎn)品培訓(xùn)模塊： | ISL28005-6 Overview Solutions for Industrial Control Applications |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.67 V/µs |
| -3db帶寬： | 237kHz |
| 電流 - 輸入偏壓： | 4.7µA |
| 電壓 - 輸入偏移： | 1200µV |
| 電流 - 電源： | 50µA |
| 電流 - 輸出 / 通道： | 8.7mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 28 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-6 |
| 包裝： | 帶卷 (TR) |
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ISL28006
19
FN6548.6
November 22, 2013
Applications Information
Functional Description
The ISL28006-20, ISL28006-50 and ISL28006-100 are single
supply, uni-directional current sense amplifiers with fixed gains
of 20V/V, 50V/V and 100V/V respectively. The ISL28006-ADJ is
single supply, uni-directional current sense amplifier with an
adjustable gain via external resistors (see Figure 80). The
ISL28006-ADJ is stable for gains of 20 and higher.
The ISL28006 is a 2-stage amplifier. Figure 76 shows the active
circuitry for high-side current sense applications where the sense
voltage is between 1.35V to 28V. Figure 77 shows the active
circuitry for ground sense applications where the sense voltage is
between 0V to 1.35V.
The first stage is a bi-level trans-conductance amp and level
translator. The gm stage converts the low voltage drop (VSENSE)
sensed across an external milli-ohm sense resistor, to a current
(@ gm = 21.3A/V). The trans-conductance amplifier forces a
current through R1 resulting to a voltage drop across R1 that is
equal to the sense voltage (VSENSE). The current through R1 is
mirrored across R5 creating a ground-referenced voltage at the
input of the second amplifier equal to VSENSE.
The second stage is responsible for the overall gain and
frequency response performance of the device. The fixed gains
(20, 50, 100) are set with internal resistors Rf and Rg. The
variable gain (ADJ) has an additional FB pin and uses external
gain resistors to set the gain of the output. For the fixed gain
amps the only external component needed is a current sense
resistor (typically 0.001 to 0.01, 1W to 2W).
The transfer function for the fixed gain parts is given in
Equation 1.
The transfer function for the adjustable gain part is given in
Equation 2.
Where ISRS is the product of the load current and the sense
resistor and is equal to VSENSE.
When the sensed input voltage is >1.35V, the gmHI amplifier
path is selected and the input gm stage derives its ~2.86A
supply current from the input source through the RS+ terminal.
When the sense voltage at RS+ drops below the 1.35V threshold,
the gmLO amplifier is enabled for Low Side current sensing. The
gmLO input bias current reverses, flowing out of the RS- pin.
Since the gmLO amplifier is sensing voltage around ground, it
cannot source current to R5. A current mirror referenced off Vcc
supplies the current to the second stage for generating a ground
input bias currents for High and Low side current sensing.
VOUT
GAIN
ISRS VOS
+
()
×
=
(EQ. 1)
VOUT
1
RF
RG
-------
+
ISRS VOS
+
()
=
(EQ. 2)
FIGURE 76. HIGH-SIDE CURRENT DETECTION
RS+
RS-
gmHI
gmLO
RS
IS
+
-
LOAD
VSENSE
1.35V
IMIRROR
+
-
OUT
Rf
Rg
R1
R5
VCC
HIGH-SIDE
SENSING
OPTIONAL
TRANSIENT
PROTECTION
OPTIONAL
FILTER
CAPACITOR
‘VSENSE
VCC = 2V to 28V
R2
R3
R4
I = 2.86A
GND
VSENSE
VRS+ = 2V TO 28V
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