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參數(shù)資料
| 型號： | NX2117ACUTR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大?。?/td> | 405K |
| 代理商： | NX2117ACUTR |
NX2116/2116A/2116B/2117/2117A
14
Rev. 3.0
03/14/06
Layout Considerations
The layout is very important when designing high
frequency switching converters. Layout will affect noise
pickup and can cause a good design to perform with
less than expected results.
Start to place the power components, make all the
connection in the top layer with wide, copper filled ar-
eas. The inductor, output capacitor and the MOSFET
should be close to each other as possible. This helps to
reduce the EMI radiated by the power traces due to the
high switching currents through them. Place input ca-
pacitor directly to the drain of the high-side MOSFET, to
reduce the ESR replace the single input capacitor with
two parallel units. The feedback part of the system should
be kept away from the inductor and other noise sources,
and be placed close to the IC. In multilayer PCB use
one layer as power ground plane and have a control cir-
cuit ground (analog ground), to which all signals are ref-
erenced.
The goal is to localize the high current path to a
separate loop that does not interfere with the more sen-
sitive analog control function. These two grounds must
be connected together on the PC board layout at a single
point.
OCP
comparator
OCP
40uA
OCP
I
OCP
R
SW
Figure 10 - Over current protection
vbus
The over current limit can be set by the following
equation
×
=
×
OCP
SET
DSON
IR
I
KR
If MOSFET R
DSON=6.5m, the worst case thermal
consideration K=1.5 and the current limit is set at 15A,
then
××
×
=
SET
DSON
OCP
I
KR
15A 1.5 6.5m
R
3.656k
I
40uA
Choose R
OCP=3.7k
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NX2117CUTR | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT, POWER GOOD & OVER VOLTAGE |
| NX2119 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT PROTECTION |
| NX2119A | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT PROTECTION |
| NX2119ACSTR | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT PROTECTION |
| NX2119ACUTR | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT PROTECTION |
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