參數資料
| 型號： | LT1970IFE#PBF |
| 廠商： | Linear Technology |
| 文件頁數： | 10/26頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP 500MA ADJ 20-TSSOP |
| 標準包裝： | 74 |
| 放大器類型： | 通用 |
| 電路數： | 1 |
| 轉換速率： | 1.6 V/µs |
| 增益帶寬積： | 3.6MHz |
| 電流 - 輸入偏壓： | 160nA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 7mA |
| 電流 - 輸出 / 通道： | 800mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 36 V，±2.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-TSSOP（0.173"，4.40mm 寬）裸露焊盤 |
| 供應商設備封裝： | 20-TSSOP-EP |
| 包裝： | 管件 |
| 產品目錄頁面： | 1320 (CN2011-ZH PDF) |
LT1970
18
1970fc
APPLICATIONS INFORMATION
In some applications it may be necessary to know what
the current into the load is at any time. Figure 10 shows an
LT1787 high side current sense amplier monitoring the
current through sense resistor RS. The LT1787 is biased
from the VEE supply to accommodate the common mode
input range of ±10V. The sense resistor is scaled down
to provide a 100mV maximum differential signal to the
current sense amplier to preserve linearity. The LT1880
amplier provides gain and level shifting to produce a 0V
to 5V output signal (2.5V DC ±5mV/mA) with up to 1kHz
full-scale bandwidth. An A/D converter could then digi-
tize this instantaneous current reading to provide digital
feedback from the circuit.
The LT1970 is just as easy to use as a standard operational
amplier. Basic amplication of a precision reference
voltage creates a very simple bench DC power supply as
shown in Figure 11. The built-in power stage produces an
adjustable 0V to 25V at 4mA to 100mA of output current.
Voltage and current adjustments are derived from the
LT1634-5 5V reference. The output current capability is
500mA, but this supply is restricted to 100mA for power
dissipation reasons. The worst-case output voltage for
maximum power dissipated in the LT1970 output stage
occurs if the output is shorted to ground or set to a voltage
near zero. Limiting the output current to 100mA sets the
maximum power dissipation to 3W. To allow the output to
Figure 9. Digitally Controlled Analog Pin Driver
VCSRC
COMMON
VEE
VCSNK
V–
FILTER
V+
18V
R6
3k
10μF
0.1μF
EN
VCC
ISNK
ISRC
SENSE–
SENSE+
TSD
OUT
+IN
R2
10.2k
R1
3.4k
0V
5V
APPLY LOAD
DRIVE
OPTIONAL TEST PIN
ON/OFF CONTROL
Hi-Z
LT1970
–18V
10μF
0.1μF
SENSE
–IN
RS
1Ω
FORCE
TEST PIN
LOAD
1970 F09
R4
10.2k
VCC
VREF
5V
CLR
DAC A
DAC B
CS/LD
SCK
DI
DAC C
DAC D
R3
3.4k
LTC1664
QUAD 10-BIT DAC
DECODER
3-WIRE
SERIAL
INTERFACE
+
R5
3k
+
VOUT = 15V
ISOURCE(MAX) =
≈ –4mA TO –500mA
≈ ±15V
CODE C – CODE D
1024
()
0.5 CODE B
1024 RS
ISINK(MAX) =
≈ 4mA TO 500mA
0.5 CODE A
1024 RS
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