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參數(shù)資料
| 型號(hào)： | NX2117ACUTR |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 11/14頁(yè) |
| 文件大?。?/td> | 405K |
| 代理商： | NX2117ACUTR |
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NX2116/2116A/2116B/2117/2117A
6
Rev. 3.0
03/14/06
APPLICATION INFORMATION
Symbol Used In Application Information:
VIN
- Input voltage
VOUT
- Output voltage
IOUT
- Output current
DVRIPPLE - Output voltage ripple
FS
- Working frequency
DIRIPPLE - Inductor current ripple
Design Example
The following is typical application for NX2116A,
the schematic is figure 1.
VIN = 12V
VOUT=1.8V
FS=600kHz
IOUT=9A
DVRIPPLE <=20mV
DVDROOP<=100mV @ 9A step
Output Inductor Selection
The selection of inductor value is based on induc-
tor ripple current, power rating, working frequency and
efficiency. Larger inductor value normally means smaller
ripple current. However if the inductance is chosen too
large, it brings slow response and lower efficiency. Usu-
ally the ripple current ranges from 20% to 40% of the
output current. This is a design freedom which can be
decided by design engineer according to various appli-
cation requirements. The inductor value can be calcu-
lated by using the following equations:
IN
OUT
RIPPLE
INS
RIPPLE
OUTPUT
V -VV
1
L=
I
VF
I
=kI
××
×
...(1)
where k is between 0.2 to 0.4.
Select k=0.3, then
××
×
OUT
12V-1.8V
1.8V1
L=
0.3 9A
12V
600kHz
L
=0.94uH
Choose inductor from COILCRAFT DO3316P-
102HC with L=1uH is a good choice.
Current Ripple is recalculated as
××
×
×=
IN
OUT
RIPPLE
OUT
INS
V -VV
1
I=
L
VF
12V-1.8V 1.8v1
=
2.55A
1uH
12V
600kHz
...(2)
Output Capacitor Selection
Output capacitor is basically decided by the
amount of the output voltage ripple allowed during steady
state(DC) load condition as well as specification for the
load transient. The optimum design may require a couple
of iterations to satisfy both condition.
Based on DC Load Condition
The amount of voltage ripple during the DC load
condition is determined by equation(3).
=
× +
××
RIPPLE
S
OUT
I
V
ESRI
8 FC
...(3)
Where ESR is the output capacitors' equivalent
series resistance,C
OUT is the value of output capacitors.
Typically when large value capacitors are selected
such as Aluminum Electrolytic,POSCAP and OSCON
types are used, the amount of the output voltage ripple
is dominated by the first term in equation(3) and the
second term can be neglected.
For this example, POSCAP are chosen as output
capacitors, the ESR and inductor current typically de-
termines the output voltage ripple.
=
RIPPLE
desire
RIPPLE
V
20mV
ESR
=
7.8m
I
2.55A
...(4)
If low ESR is required, for most applications, mul-
tiple capacitors in parallel are better than a big capaci-
tor. For example, for 20mV output ripple, POSCAP
2R5TPE220MC with 12m
are chosen.
E
R IPPLE
ES RI
N
V
×
=
...(5)
Number of Capacitor is calculated as
×
=
12m
2.56A
N
20mV
N =1.5
The number of capacitor has to be round up to a
integer. Choose N =2.
If ceramic capacitors are chosen as output ca
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| NX2117CUTR | 制造商:MICROSEMI 制造商全稱(chēng):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(chēng):Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT PROTECTION |
| NX2119A | 制造商:MICROSEMI 制造商全稱(chēng):Microsemi Corporation 功能描述:SYNCHRONOUS PWM CONTROLLER WITH CURRENT LIMIT PROTECTION |
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