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參數(shù)資料
| 型號： | LT6100IDD#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE 8DFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 0.05 V/µs |
| -3db帶寬： | 150kHz |
| 電壓 - 輸入偏移： | 80µV |
| 電流 - 電源： | 60µA |
| 電流 - 輸出 / 通道： | 15mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 36 V，±1.35 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 8-DFN-EP（3x3） |
| 包裝： | 管件 |
LT6100
10
6100fc
The LT6100 high side current sense amplifier (Figure 1)
provides accurate unidirectional monitoring of current
through a user-selected sense resistor. The LT6100 fea-
tures a fully specified 4.1V to 48V input common mode
range. A high PSRR VCC supply (2.7V to 36V) powers the
current sense amplifier and the internal op amp circuitry.
The input sense voltage is level shifted from the positive
sense power supply to the ground reference and amplified
by a user-selected gain to the output. The buffered output
voltage is directly proportional to the current flowing
through the sense resistor.
Theory of Operation (Refer to Figure 1)
Current from the source at VS+ flows through RSENSE to
the load at VS–, creating a sense voltage, VSENSE. Inputs
VS+ and VS– apply the sense voltage to RG2. The opposite
ends of resistors RG1 and RG2 are forced to be at equal
potentials by the voltage gain of amplifier A1. The current
through RG2 is forced to flow through transistor Q1 and is
sourcedtonodeVO1.ThecurrentfromRG2flowingthrough
resistor RO gives a voltage gain of ten, VO1/VSENSE = RO/
RG2 = 10V/V. The sense amplifier output at VO1 is ampli-
fied again by amplifier A2. The inputs of amplifier A2 can
operate to ground which ensures that small sense voltage
signals are detected. Amplifier A2 can be programmed to
different gains via Pin 6 and Pin 7. Thus, the total gain of
the system becomes AV = 10 A2 and VOUT = VSENSE AV.
Gain Setting
The LT6100 gain is set by strapping (or floating) the two
gain pins (see Table 1). This feature allows the user to
“zoom in” by increasing the gain for accurate measure-
ment of low currents.
AV = 10V/V G2, G2 is the gain of op amp A2.
Table 1. Gain Set with Pin 6 and Pin 7
A2 (PIN 6)
A4 (PIN 7)
G2
AV
Open
1
10
VEE
Out
1.25
12.5
VEE
Open
2
20
Out
VEE
2.5
25
Open
VEE
4
40
VEE
5
50
Selection of External Current Sense Resistor
External RSENSE resistor selection is a delicate trade-off
betweenpowerdissipationintheresistorandcurrentmea-
surement accuracy. The maximum sense voltage may be
as large as ±300mV to get maximum dynamic range. For
high current applications, the user may want to minimize
the sense voltage to minimize the power dissipation in
the sense resistor. The LT6100’s low input offset voltage
of 80V allows for high resolution of low sense voltages.
This allows limiting the maximum sense voltage while still
providing high resolution current monitoring.
Kelvin connection of the LT6100’s VS+ and VS– inputs to
the sense resistor should be used to provide the highest
accuracy in high current applications. Solder connections
and PC board interconnect resistance (approximately
0.5mΩ per square) can be a large error in high current
systems. A 5A application might choose a 20mΩ sense
resistor to give a 100mV full-scale input to the LT6100.
Input offset voltage will limit resolution to 4mA. Neglect-
ing contact resistance at solder joints, even one square
of PC board copper at each resistor end will cause an
error of 5%. This error will grow proportionately higher
as monitored current levels rise.
applicaTions inForMaTion
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