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參數(shù)資料
| 型號(hào)： | LT6654AHS6-5#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 5 V, PDSO6 |
| 封裝： | 1 MM HEIGHT, LEAD FREE, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件頁數(shù)： | 6/18頁 |
| 文件大小： | 839K |
| 代理商： | LT6654AHS6-5#TRPBF |
LT6654
14
6654fb
applicaTions inForMaTion
PC Board Layout
The mechanical stress of soldering a surface mount volt-
age reference to a PC board can cause the output voltage
to shift and temperature coefficient to change. These two
changes are not correlated. For example, the voltage may
shift but the temperature coefficient may not.
To reduce the effects of stress-related shifts, mount the
reference near the short edge of the PC board or in a
corner. In addition, slots can be cut into the board on
two sides of the device.
The capacitors should be mounted close to the LT6654.
The GND and VOUT traces should be as short as possible
to minimize I R drops, since high trace resistance directly
impacts load regulation.
Figure 12. Lead Free Reflow Profile
MINUTES
TEMPERA
TURE
(°C)
0
75
RAMP
DOWN
tP
30s
40s
tL
130s
120s
150
225
300
2
4
6
8
6654 F12
10
RAMP TO
150°C
380s
TP = 260°C
TL = 217°C
TS(MAX) = 200°C
TS = 190°C
T = 150°C
Figure 13. Output Voltage Shift Due to IR Reflow (%)
CHANGE IN OUTPUT (ppm)
–140
0
NUMBER
OF
UNITS
2
4
6
8
10
12
14
–120 –100 –80 –60
6654 F13
–40
0
–20
260°C 3 CYCLES
260°C 1 CYCLE
IR Reflow Shift
The different expansion and contraction rates of the ma-
terials that make up the LT6654 package may cause the
output voltage to shift after undergoing IR reflow. Lead
free solder reflow profiles reach over 250°C, considerably
more than with lead based solder. A typical lead free IR
reflow profile is shown in Figure 12. Similar profiles are
found using a convection reflow oven. LT6654 devices run
uptothreetimesthroughthisreflowprocessshowthatthe
standard deviation of the output voltage increases with a
slightnegativemeanshiftof0.003%asshowninFigure13.
While there can be up to 0.014% of output voltage shift,
the overall drift of the LT6654 after IR reflow does not
vary significantly.
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| LT6654AMPS6-2.5#PBF | 制造商:Linear Technology 功能描述:SC-Refs/Series, Cut Tape High Voltage, High Current Voltage Reference |
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