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參數(shù)資料
| 型號： | LPV531MK |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Programmable Micropower CMOS Input, Rail-to-Rail Output Operational Amplifier |
| 中文描述： | OP-AMP, 5000 uV OFFSET-MAX, 4.6 MHz BAND WIDTH, PDSO6 |
| 封裝： | TSOT-23, 6 PIN |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 955K |
| 代理商： | LPV531MK |
Application Information
The LPV531 is an extremely versatile operational amplifier
because performance and power consumption can be ad-
justed during operation. This provides a method to dynami-
cally optimize the supply current, the bandwidth and the
output short circuit current in the application. The power level
can be set by the current drawn from the I
pin according
to the application performance requirements.
CIRCUIT TOPOLOGY
As shown in
Figure 1
, the LPV531 contains two internal bias
reference generators that deliver a reference current (I
)
to the amplifier core. The programmable bias generator gen-
erates a 110 mV reference voltage (V
). This reference
voltage is converted into a programmable reference current
(I
) through the internal resistor (R
) and the external
resistor (R
) connected to the I
pin. Internally, I
is
added to the output current from the low power bias genera-
tor (I
). When the I
pin is left floating, I
PROG
equals
zero and the I
equals I
. The value of I
is such
that in this mode the power supply current is below 1 μA. In
this 1 μA power mode, the LPV531 is functional but perfor-
mance over the full temperature range is not guaranteed.
The 1 μA power mode operation is only recommended for
applications with a temperature range between 0 and 70C.
POWER MODE CONTROL
To illustrate typical configurations three possible solutions to
control the power mode(s) of the LPV531 will be described.
1. Single Power Mode
If the application requires one single power mode for the
LPV531, then the easiest way to achieve this is to connect a
resistor (R
) from the I
pin to V
. Together with the
internal circuitry, R
will determine the current drawn from
the I
pin. Internally the I
SEL
pin is connected to an 11 k
internal
series
resistor
)
V
INT
= 110 mV. This set up is illustrated in
Figure 2
.
For a desired supply current, bandwidth, short circuit current,
or load resistance, the required value of R
can be calcu-
lated using the equations in the section “DETERMINING
THE I
SEL
LEVELS”.
which
is
biased
at
20132337
FIGURE 1. Simplified Schematic
20132336
FIGURE 2. Single Power Mode
L
www.national.com
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