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參數(shù)資料
| 型號(hào)： | LT6100CDD |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Precision, Gain Selectable High Side Current Sense Amplifier |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | 3 X 3 MM, PLASTIC, MO-229WEED-1, DFN-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 257K |
| 代理商： | LT6100CDD |
10
LT6100
6100f
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 V
CC
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 V
S+
flows through R
SENSE
to the
load at V
S–
, creating a sense voltage, V
SENSE
. Inputs V
S+
and V
S–
apply the sense voltage to R
G2
. The opposite ends
of resistors R
G1
and R
G2
are forced to be at equal poten-
tials by the voltage gain of amplifier A1. The current
through R
G2
is forced to flow through transistor Q1 and is
sourced to node V
O1
. The current from R
G2
flowing
through resistor R
O
gives a voltage gain of ten, V
O1
/V
SENSE
= R
O
/R
G2
= 10V/V. The sense amplifier output at V
O1
is
amplified 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 pro-
grammed to different gains via Pin 6 and Pin 7. Thus, the
total gain of the system becomes A
V
= 10 A2 and V
OUT
=
V
SENSE
A
V
.
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.
A
V
= 10V/V G2, G2 is the gain of op amp A2.
Table 1. Gain Set with Pin 6 and Pin 7
A2 (PIN 6)
Open
V
EE
V
EE
Out
Open
V
EE
A4 (PIN 7)
Open
Out
Open
V
EE
V
EE
V
EE
G2
1
1.25
2
2.5
4
5
A
V
10
12.5
20
25
40
50
Selection of External Current Sense Resistor
External R
SENSE
resistor selection is a delicate trade-off
between power dissipation in the resistor and current
measurement 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 mini-
mize the sense voltage to minimize the power dissipation
in the sense resistor. The LT6100’s low input offset
voltage of 80
μ
V 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 V
S+
and V
S–
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
0.5m
per square) can be a large error in high current
systems. A 5A application might choose a 20m
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 moni-
tored current levels rise.
APPLICATIU
W
U
U
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| LT6100CDD#PBF | 功能描述:IC AMP CURR SENSE HI SIDE 8-DFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| LT6100CDD#TRPBF | 功能描述:IC AMP CURRENT SENSE 8DFN RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 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-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
| LT6100CMS8 | 制造商:Linear Technology 功能描述:SP Amp Current Sense Amp Single 36V 8-Pin MSOP |
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| LT6100CMS8#TR | 制造商:Linear Technology 功能描述:SP Amp Current Sense Amp Single 36V 8-Pin MSOP T/R |
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