參數(shù)資料
型號(hào)： LM27241MTC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Synchronous Buck Regulator Controller for Mobile Systems
中文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO20
封裝： PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 20/27頁(yè)
文件大?。?/td> 1336K
代理商： LM27241MTC
Application Information
(Continued)
Zero Frequency due to R
ESR
:
Complex Poles due to output inductor and output capacitors:
Type III Compensator (PID)
Type III Compensator Transfer Function
The Type III compensation is needed in designs where
output ceramic capacitors are used, and therefore is very
small. The Zero frequency, due to R
ESR
, is usually much
larger than the crossover frequency when ceramic capaci-
tors are used. Rule of thumb is if F
ZERO
>
F
BW
use type III
compensation.
ω
Z1
and
ω
Z2
: +20dB/DEC and +45DEG/DEC phase.
ω
: Adds phase lead in the vicinity of the crossover fre-
quency.
ω
PZ1
and
ω
P2
: -20dB/DEC and -45DEG/DEC phase.
Must be present to in the compensation to ensure the gain
rolls off at high frequency and prevent switching ripple from
disrupting the regulation of the converter.
The Loop Bandwidth ( F
BW
) or known as the crossover
frequency (F
CROSS
) is usually set by the designer, with the
basic guideline:
F
SW
/10
≤
F
BW
≤
F
SW
/5
COMPENSATION DESIGN STEPS
Output Filter:
1) Choose crossover frequency
2) Determine complex pole frequency due to output filter:
3) Determine zero frequency due to R
ESR
Type III Compensator:
1) Frequency at which maximum phase boost occurs is at
the average between the frequency of F
P2
and F
Z2
Place this at the Crossover frequency:
where 60
≥ Φ
MAX
≥
45
20120148
FIGURE 16. Type III Compensator (PID)
L
www.national.com
20
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參數(shù)描述
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LM27241MTCX 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Synchronous Buck Regulator Controller for Mobile Systems
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