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參數資料
| 型號： | LT3092MPST#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 11/22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
11
3092fb
APPLICATIONS INFORMATION
capacitor on the lower impedance output, and the same
restrictions do not apply. Capacitors in the range of 0.1糉
to 1糉 usually provide suf cient bypassing on the input,
and the value of input capacitance may be increased
without limit.
If an application uses GND referred capacitors on the input
or output (particularly the input), pay attention to the length
of the lines powering and returning ground from the circuit.
In the case where long power supply and return lines are
coupled with low ESR input capacitors, application-speci c
voltage spikes, oscillations and reliability concerns may
be seen. This is not an issue with LT3092 stability, but
rather the low ESR capacitor forming a high-Q resonant
tank circuit with the inductance of the input wires. Adding
series resistance with the input of the LT3092, or with the
input capacitor, often solves this. Resistor values of 0.1?
to 1?are often suf cient to dampen this resonance.
Give extra consideration to the use of ceramic capacitors.
Ceramic capacitors are manufactured with a variety of di-
electrics, each with different behavior across temperature
and applied voltage. The most common dielectrics used
are speci ed with EIA temperature characteristic codes of
Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are
good for providing high capacitances in a small package,
but they tend to have strong voltage and temperature
coef cients as shown in Figures 5 and 6. When used with
a 5V regulator, a 16V 10糉 Y5V capacitor can exhibit an
effective value as low as 1糉 to 2糉 for the DC bias voltage
applied and over the operating temperature range. The X5R
and X7R dielectrics result in more stable characteristics
and are more suitable for use as the output capacitor.
The X7R type has better stability across temperature,
while the X5R is less expensive and is available in higher
values. Care still must be exercised when using X5R and
X7R capacitors; the X5R and X7R codes only specify
operating temperature range and maximum capacitance
change over temperature. Capacitance change due to DC
bias with X5R and X7R capacitors is better than Y5V and
Z5U capacitors, but can still be signi cant enough to drop
capacitor values below appropriate levels. Capacitor DC
bias characteristics tend to improve as component case
size increases, but expected capacitance at operating
voltage should be veri ed.
Voltage and temperature coef cients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress. In a
ceramic capacitor the stress can be induced by vibrations
in the system or thermal transients.
DC BIAS VOLTAGE (V)
3092 F05
20
0
20
40
60
80
100
0
4
8 10
2
6
12 14
X5R
Y5V
16
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10糉
Figure 5. Ceramic Capacitor DC Bias Characteristics
TEMPERATURE (癈)
50
40
20
0
20
40
60
80
100
25
75
3092 F06
25 0
50
100 125
Y5V
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10糉
Figure 6. Ceramic Capacitor Temperature Characteristics
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