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參數(shù)資料
| 型號： | LT3092MPST#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/22頁 |
| 文件大小： | 249K |
| 描述： | IC PROG CURRENT SOURCE SOT223-3 |
| 標準包裝： | 2,000 |
| 功能： | 電流源 |
| 精確度： | ±1% |
| 輸入電壓： | 1.2 V ~ 40 V |
| 電流 - 輸出： | 200mA |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | TO-261-4，TO-261AA |
| 供應商設備封裝： | SOT-223-3 |
| 包裝： | 帶卷 (TR) |
LT3092
9
3092fb
APPLICATIONS INFORMATION
inductive components and may be complex distributed
networks. In addition, the current sources value will dif-
fer between applications and its connection may be GND
referenced, power supply referenced or oating in a signal
line path. Linear Technology strongly recommends that
stability be tested in situ for any LT3092 application.
In LT3092 applications with long wires or PCB traces, the
inductive reactance may cause instability. In some cases,
adding series resistance to the input and output lines (as
shown in Figure 2) may suf ciently dampen these possible
high-Q lines and provide stability. The user must evaluate
the required resistor values against the designs headroom
constraints. In general, operation at low output current
levels (< 5mA) automatically requires higher values of
programming resistors and may provide the necessary
damping without additional series impedance.
If the line impedances in series with the LT3092 are
complex enough such that series damping resistors are
not suf cient, a frequency compensation network may be
necessary. Several options may be considered.
From this point, selecting R
OUT
is easy, as it is a straight-
forward calculation from R
SET
. Take note, however, resistor
errors must be accounted for as well. While larger voltage
drops across R
SET
minimize the error due to offset, they
also increase the required operating headroom.
Obtaining the best temperature coef cient does not require
the use of expensive resistors with low ppm temperature
coef cients. Instead, since the output current of the LT3092
is determined by the ratio of R
SET
to R
OUT
, those resistors
should have matching temperature characteristics. Less
expensive resistors made from the same material will
provide matching temperature coef cients. See resistor
manufacturers data sheets for more details.
Stability and Frequency Compensation
The LT3092 does not require input or output capacitors
for stability in many current-source applications. Clean,
tight PCB layouts provide a low reactance, well controlled
operating environment for the LT3092 without requiring
capacitors to frequency-compensate the circuit. The front
page Typical Application circuit illustrates the simplicity
of using the LT3092.
Some current source applications will use a capacitor
connected in parallel with the SET pin resistor to lower
the current sources noise. This capacitor also provides a
soft-start function for the current source. This capacitor
connection is depicted in Figure 7 (see the Quieting the
Noise section).
When operating with a capacitor across the SET pin resis-
tor, external compensation is usually required to maintain
stability and compensate for the introduced pole. The
following paragraphs discuss methods for stabilizing
the LT3092 for either this capacitance or other complex
impedances that may be presented to the device. Linear
Technology strongly recommends testing stability in situ
with nal components before beginning production.
Although the LT3092s design strives to be stable without
any capacitors over a wide variety of operating conditions,
it is not possible to test for all possible combinations of
input and output impedances that the LT3092 will encounter.
These impedances may include resistive, capacitive and
Figure 2. Adding Series Resistor Decouples
and Dampens Long Line Reactances
IN
SET
OUT
+
LT3092
10糀
R
SET
R
OUT
R
SERIES
R
SERIES
LONG LINE
REACTANCE/INDUCTANCE
3092 F02
LONG LINE
REACTANCE/INDUCTANCE
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