參數(shù)資料
型號: MIC4722
廠商: Micrel Semiconductor,Inc.
英文描述: 3mm x 3mm 2.7MHz 3A PWM Buck Regulator
中文描述: 采用3mm x 3mm 2.7兆赫3A PWM降壓調(diào)節(jié)
文件頁數(shù): 15/20頁
文件大小: 581K
代理商: MIC4722
Micrel, Inc.
MIC4722
September 2007
15
M9999-090507-B
0
5
10
15
20
25
30
35
40
45
50
1
2
3
4
5
P
OUTPUT VOLTAGE (V)
Max. Amount of Phase Boost
Obtainable using C
FF
vs. Output
Voltage
V
REF
= 1V
By looking at the graph, phase margin can be affected to
a greater degree with higher output voltages.
The next bode plot shows the phase margin of a 1.8V
output at 3A without a feedforward capacitor.
-30
-20
-10
0
10
20
30
40
50
60
G
FREQUENCY (Hz)
Bode Plot
V
IN
=3.3V, V
OUT
=1.8V, I
OUT
=3A
-105
1M
-70
-35
0
35
70
105
140
175
210
P
100
1k
10k
100k
L=1μH
C
OUT
= 4.7μF
R1 = 10k
R2 = 12.4k
C
FF
= 0pF
GAIN
PHASE
As you can see the typical phase margin, using the
same resistor values as before without a feedforward
capacitor results in 33.6 degrees of phase margin. Our
prior measurement with a feedforward capacitor yielded
a phase margin of 47 degrees. The feedforward
capacitor has given us a phase boost of 13.4 degrees
(47 degrees- 33.6 Degrees = 13.4 Degrees).
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