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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)： | 3/14頁 |
| 文件大小： | 405K |
| 代理商： | NX2117ACUTR |
NX2116/2116A/2116B/2117/2117A
11
Rev. 3.0
03/14/06
B. Type II compensator design
If the electrolytic capacitors are chosen as power
stage output capacitors, usually the Type II compensa-
tor can be used to compensate the system.
Type II compensator can be realized by simple RC
circuit without feedback as shown in figure 7. R
3 and C1
introduce a zero to cancel the double pole effect. C
2
introduces a pole to suppress the switching noise. The
following equations show the compensator pole zero lo-
cation and constant gain.
1
m3
12
z
31
p
32
R
Gain=g
R
... (15)
R +R
1
F =
... (16)
2
RC
1
F
... (17)
2
RC
××
×π ××
≈
×π ××
Ga
in(db)
compensator
loop gain
power stage
40dB/decade
20dB/decade
Gain
FZ
LC
F
ESR
F
O
F
FP
Figure 6 - Bode plot of Type II compensator
gm
R3
C1
C2
Ve
Vout
Vref
Fb
R2
R1
Figure 7 - Type II compensator with
transconductance amplifier
For this type of compensator, F
O has to satisfy
F
LC<FESR<<FO<=1/10~1/5Fs.
The following is parameters for type II compensa-
tor design. Input voltage is 12V, output voltage is 1.8V,
output inductor is 1uH, output capacitors are two 1500uF
with 13m
electrolytic capacitors.
1.Calculate the location of LC double pole F
LC
and ESR zero F
ESR.
LC
OUT
1
F
2
LC
1
2
1uH 3000uF
2.9kHz
=
×π ××
=
×π ××
=
ESR
OUT
1
F
2
ESRC
1
2
6.5m
3000uF
8.2kHz
=
×π ××
=
×π ×
×
=
2.Set R
2 equal to 1k.
×
=
2
REF
1
OUT
REF
RV
1k
0.8V
R =
800
V
-V
1.8V-0.8V
Choose R
1=806.
3. Set crossover frequency at 1/10~ 1/5 of the
swithing frequency, here FO=60kHz.
4.Calculate R
3 value by the following equation.
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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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