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參數(shù)資料
| 型號： | LT1371CT7 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 20-PDIP 0 to 70 |
| 中文描述： | SWITCHING REGULATOR, 580 kHz SWITCHING FREQ-MAX, PSFM7 |
| 封裝： | TO-220, 7 PIN |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 320K |
| 代理商： | LT1371CT7 |
12
LT1371
APPLICATIU
T7 Package Layout Considerations
Electrical connection to the tab of a T7 package is required
for proper device operation. If the tab is tied directly to the
ground plane (Figure 4) no other considerations are nec-
essary. If the tab is not connected directly to the ground
plane, as in a vertically mounted application, a separate
electrical connection from the tab to a “floating node” is
required. Ground returns for the V
IN
capacitor, V
C
compo-
nents and output feedback resistor divider are then con-
nected to the floating node. This is shown schematically in
Figure 7. All other system ground connections are made to
Pin 4.
The electrical connection from the T7 package tab to the
floating node must be a low resistance (<0.1
), low
inductance (<20nH) path which can be accomplished with
a jumper wire or an electrically conductive heat sink.
Bolt the jumper wire directly to the tab using a solder tail
to maintain low resistance. The jumper wire length should
not exceed 3/4 inch of 24 AWG gauge wire or larger to
minimize the inductance.
Vertically mounted electrically conductive heat sinks are
available from many heat sink manufacturers. These heat
sinks also have tabs that solder directly to the board
creating the required low resistance, low inductance path
from the tab to the floating node. The tab should be bolted
U
W
U
LT1371T7
V
IN
V
IN
V
C
GND
TAB
SYSTEM GROUND
FLOATING NODE
(TAB TIES INTERNALLY
TO PIN 4 GROUND)
4
2
1
5
7
GND
FB
LT1371 F07
V
SW
V
OUT
Figure 7. Tab Connections for Vertically Mounted T7 Package
or soldered directly to the heat sink to maintain low
resistance. Heat sinks are available in clip-on styles but are
only recommended if the tab to heat sink contact resis-
tance can be maintained below 0.1
for the life of the
product.
More Help
For more detailed information on switching regulator
circuits, please see Application Note 19. Linear Technol-
ogy also offers a computer software program,
SwitcherCAD, to assist in designing switching converters.
In addition, our Applications Department is always ready
to lend a helping hand.
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