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參數(shù)資料
| 型號： | LTC1430IS#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大小： | 220K |
| 代理商： | LTC1430IS#TR |
14
LTC1430
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Figure 11. Typical Schematic Showing Layout Considerations
VOUT
R1
NC
R2
LTC1430 F12
LTC1430
SENSE+
FB
SENSE–
Figure 12. Using External Resistors to Set Output Voltages
+
LTC1430 F11
3.3V
2.7
H/15A
TOTAL
1980
F
(330
F
6.3V
×6)
M1A*
M2*
PVCC1
IMAX
FREQSET
GND
PGND
SHDN
COMP
NC
SS
PVCC2
VCC
PGND
GND
RC
7.5k
0.1
F
1
F
0.1
F
CC
4700pF
C1
220pF
CSS
0.01
F
4.7
F
35V
100
G1
IFB
G2
FB
SENSE+
NC
LTC1430
SENSE–
GND
PGND
* MOTOROLA MTD20N03HL
1N4148
5V
M1B*
TOTAL
880
F
(220
F
10V
×4)
power inductor will generally be the most massive single
component on the board; it can require a mechanical hold-
down in addition to the solder on its leads, especially if it
is a surface mount type.
The power MOSFETs used require some care to ensure
proper operation and reliability. Depending on the current
levels and required efficiency, the MOSFETs chosen may
be as large as TO-220s or as small as SO-8s. High
efficiency circuits may be able to avoid heat sinking the
power devices, especially with TO-220 type MOSFETs. As
an example, a 90% efficient converter working at a steady
3.3V/10A output will dissipate only (33W/90%) 10% =
3.7W. The power MOSFETs generally account for the
majority of the power lost in the converter; even assuming
that they consume 100% of the power used by the
converter, that’s only 3.7W spread over two or three
devices. A typical SO-8 MOSFET with a RON suitable to
provide 90% efficiency in this design can commonly
dissipate 2W when soldered to an appropriately sized
piece of copper trace on a PC board. Slightly less efficient
or higher output current designs can often get by with
standing a TO-220 MOSFET straight up in an area with
some airflow; such an arrangement can dissipate as much
as 3W without a heat sink. Designs which must work in
high ambient temperatures or which will be routinely
overloaded will generally fare best with a heat sink.
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