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參數(shù)資料
| 型號： | LT1970 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 500mA Power Op Amp with Adjustable Precision Current Limit |
| 中文描述： | 500mA的電源運(yùn)算放大器精密可調(diào)電流限制 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 233K |
| 代理商： | LT1970 |
9
LT1970
1970f
3
19
7
9
8
17
16
18
15
12
13
–
+
–
+
–
+
I
SINK
1970TC
R
FIL
1k
R
CS
1
R
LOAD
1k
I
SRC
D2
D1
1
×
Q1
Q2
PS1
4
5
6
2
GM1
ENABLE
COMMON
VC
SRC
VC
SRC
VC
SNK
5V
15V
VC
SNK
ISRC
ISNK
–IN
V
IN
R
G
1k
+IN
ENABLE
TSD
14
V
CC
V
+
15V
–15V
OUT
SENSE
+
FILTER
SENSE
–
V
–
V
EE
2, 10, 11, 20
10k
10k
10k
R
FB
1k
V
SRC
+
V
SNK
+
+
BLOCK DIAGRW
U
The LT1970 power op amp with precision controllable
current limit is a flexible voltage and current source
module. The drawing on the front page of this data sheet
is representative of the basic application of the circuit,
however many alternate uses are possible with proper
understanding of the subcircuit capabilities.
CIRCUIT DESCRIPTION
Main Operational Amplifier
Subcircuit block GM1, the 1X unity-gain current buffer
and output transistors Q1 and Q2 form a standard opera-
tional amplifier. This amplifier has
±
500mA current output
capability and a 3.6MHz gain bandwidth product. Most
applications of the LT1970 will use this op amp in the main
signal path. All conventional op amp circuit configurations
are supported. Inverting, noninverting, filter, summation
or nonlinear circuits may be implemented in a conven-
tional manner. The output stage includes current limiting
at
±
800mA to protect against fault conditions. The input
stage has high differential breakdown of 36V minimum
between –IN and +IN. No current will flow at the inputs
when differential input voltage is present. This feature is
important when the precision current sense amplifiers
“I
SINK
” and “I
SRC
” become active.
Current Limit Amplifiers
Amplifier stages “I
SINK
” and “I
SRC
” are very high transcon-
ductance amplifier stages with independently controlled
offset voltages. These amplifiers monitor the voltage
between input pins SENSE
+
and SENSE
–
which usually
sense the voltage across a small external current sense
resistor. The transconductance amplifiers outputs con-
nect to the same high impedance node as the main input
stage GM1 amplifier. Small voltage differences between
SENSE
+
and SENSE
–
, smaller than the user set VC
SNK
/10
and VC
SRC
/10 in magnitude, cause the current limit ampli-
fiers to decouple from the signal path. This is functionally
indicated by diodes D1 and D2 in the Block Diagram. When
the voltage V
SENSE
increases in magnitude sufficient to
equal or overcome one of the offset voltages VC
SNK
/10 or
VC
SRC
/10, the appropriate current limit amplifier becomes
APPLICATIOU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1970_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:500mA Power Op Amp with Adjustable Precision Current Limit |
| LT1970A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:500mA Power Op Amp with Adjustable Precision Current Limit |
| LT1970ACFE#PBF | 功能描述:IC OP AMP 500MA ADJ CURR 20TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1970ACFE#TRPBF | 功能描述:IC OP AMP 500MA ADJ CURR 20TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| LT1970AIFE#PBF | 功能描述:IC OP AMP 500MA ADJ CURR 20TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
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