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參數(shù)資料
| 型號(hào)： | LM5010MHX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁(yè)數(shù)： | 17/19頁(yè) |
| 文件大?。?/td> | 453K |
| 代理商： | LM5010MHX |
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Applications Information
(Continued)
(12)
where 0.11
is the minimum value of the internal resistance
from S
to I
. The next smaller standard value resistor
should be used for R
. With the addition of R
it is neces-
sary to check the average and peak current values to ensure
they do not exceed the LM5010 limits. At maximum load
current the average current through the internal sense resis-
tor is:
(13)
If I
is less than 2.0A no changes are necessary. If it
exceeds 2.0A, R
CL
must be reduced. The upper peak of the
inductor current (I
), at maximum load current, is calcu-
lated using the following:
(14)
where I
OR(max)
is calculated using Equation 9. If I
PK+
ex-
ceeds 3.5A , the inductor value must be increased to reduce
the ripple amplitude. This will necessitate recalculation of
I
OR(min)
, I
PK-
, and R
CL
.
When the circuit is in current limit, the upper peak current out
of the SW pin is
The inductor L1 and diode D1 must be rated for this current.
PC BOARD LAYOUT
The LM5010 regulation, over-voltage, and current limit com-
parators are very fast, and will respond to short duration
noise pulses. Layout considerations are therefore critical for
optimum performance. The layout must be as neat and
compact as possible, and all the components must be as
close as possible to their associated pins. The current loop
formed by D1, L1, C2, and the S
GND
and I
SEN
pins should be
as small as possible. The ground connection from C2 to C1
should be as short and direct as possible. If it is expected
that the internal dissipation of the LM5010 will produce high
junction temperatures during normal operation, good use of
the PC board’s ground plane can help considerably to dissi-
pate heat. The exposed pad on the IC package bottom can
be soldered to a ground plane, and that plane should both
extend from beneath the IC, and be connected to exposed
ground plane on the board’s other side using as many vias
as possible. The exposed pad is internally connected to the
IC substrate.
The use of wide PC board traces at the pins, where possible,
can help conduct heat away from the IC. The four No Con-
nect pins on the TSSOP package are not electrically con-
nected to any part of the IC, and may be connected to
ground plane to help dissipate heat from the package. Judi-
cious positioning of the PC board within the end product,
along with the use of any available air flow (forced or natural
convection) can help reduce the junction temperature.
L
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM5010MHX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM5010SD | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM5010SD/MEY8 | 制造商:Texas Instruments 功能描述: |
| LM5010SD/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 HIGH VOLTAGE 1A STEP DOWN SWITCHING REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM5010SDX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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