參數(shù)資料
型號: PRM48BF480T400A00
元件分類: 穩(wěn)壓器
英文描述: 8.33 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, DMA24
封裝: ROHS COMPLIANT PACKAGE-24
文件頁數(shù): 11/22頁
文件大小: 1097K
代理商: PRM48BF480T400A00
Rev. 1.1
12 / 2010
Page 19 of 22
PRM48BF480T400A00
(Formerly VIP0001TFJ)
VI CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
Open Loop Gain vs. Frequency
-40
-20
0
20
40
60
80
Frequency, Log scale
(y-intercept is application specific)
Ga
in
(
d
B
)
PRM Open Loop Max Load
A
B
E
F
I
J
K
L
Compensation Gain
Application's op-amp GBW
C
G
FCMAX
FCMIN
PRM Open Loop Min Load
Figure 27 – Reference asymptotic Bode plot for the considered system
10.2.6 High Frequency Pole Design (C2):
Using Equation [3], C2 should be selected so that FP2 is at
least one decade above FCMAX and prior to the gain
bandwidth product of the operational amplifier (10MHz for
this example). For applications with a higher desired
crossover frequency the use of a high gain bandwidth
product amplifier may be necessary to ensure that the real
pole can be set at least one decade above the maximum
crossover frequency.
10.2.7 Verifying Stability:
The preferred method for verifying stability is to use a
network analyzer, measuring the closed loop response
across various lines and load conditions.
In the absence of a network analyzer, a load step transient
response can be used in order to estimate stability.
Figure 28 illustrates an example of a load step response.
Equation [4] can be used to predict the phase margin
based on the ratio of the “kick” to “droop” (as defined in
Fig. 28).
Figure 28 – load step response example and “droop”
vs. “kick” definition
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