参数资料
型号: MIC4723YML TR
厂商: Micrel Inc
文件页数: 15/20页
文件大小: 0K
描述: IC REG BUCK ADJ 3A 12MLF
标准包装: 1
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调至 1V
输入电压: 2.7 V ~ 5.5 V
频率 - 开关: 2MHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 12-VFDFN 裸露焊盘,12-MLF?
包装: 标准包装
供应商设备封装: 12-MLF?(4x4)
产品目录页面: 1093 (CN2011-ZH PDF)
其它名称: 576-1656-6
Micrel, Inc.
MIC4723
50
Max. Amount of Phase Boost
Obtainable using C FF vs. Output
Voltage
Bode Plot
V =3.3V, V =1.8V, I =3A
IN OUT OUT
60 210
45
40
35
30
50
40
30
20
PHASE
175
140
105
70
-10 R1 = 10k
25
20
15
10
5
0
1
V = 1V
REF
2 3 4
OUTPUT VOLTAGE (V)
5
10 L=1μH
0 C OUT = 4.7μF
GAIN
R2 = 12.4k
-20 C = 0pF
FF
-30
100 1k 10k 100k
FREQUENCY (Hz)
35
0
-35
-70
-105
1M
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.
As one 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).
June 2008
15
M9999-060308-E
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