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参数资料
| 型号： | MIC4724YMME |
| 厂商： | Micrel Inc |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 10MSOP |
| 标准包装： | 100 |
| 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： | 3 V ~ 6 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-3120-5 |
Micrel, Inc.
Output Impedance and Transient
dBm
MIC4724
Response
Output impedance, simply stated, is the amount of
? I =
10 10 × 1mW × 50 ? × 2
0 . 707 × R LOAD
Z OUT =
R DSON + DCR + X L
Z TOTAL = X COUT
V OUT =1.8V
C =4.7μF + 0.1μ
output voltage deviation vs. the load current deviation.
The lower the output impedance, the better.
? V OUT
? I OUT
Output impedance for a buck regulator is the parallel
impedance of the output capacitor and the MOSFET and
inductor divided by the gain;
GAIN
The following graph shows output impedance vs
frequency at 3A load current sweeping the AC current
from 10Hz to 10MHz, at 1A peak to peak amplitude.
Output Impedance
vs. Frequency
1
L=1μH
OUT
0.1
3.3VIN
10
To measure output impedance vs. frequency, the load
current must be load current must be swept across the
frequencies measured, while the output voltage is
monitored. Figure 9 shows a test set-up to measure
output impedance from 10Hz to 1MHz using the
MIC5190 high speed controller.
0.01
0.001
5V IN
100 1k 10k 100k 1M
FREQUENCY (Hz)
From this graph, one can see the effects of bandwidth
and output capacitance. For frequencies <200KHz, the
output impedance is dominated by the gain and
inductance. For frequencies >200KHz, the output
impedance is dominated by the capacitance. A good
approximation for transient response can be calculated
from determining the frequency of the load step in amps
per second;
f =
A/sec
2 π
Then, determine the output impedance by looking at the
output impedance vs frequency graph. Then calculating
↓ Z TOTAL =
↓ R DSON + DCR + X L
X COUT
Figure 9. Output Impedance Measurement
By setting up a network analyzer to sweep the feedback
current, while monitoring the output of the voltage
regulator and the voltage across the load resistance,
output impedance is easily obtainable. To keep the
current from being too high, a DC offset needs to be
applied to the network analyzer’s source signal. This can
be done with an external supply and 50 ? resistor. Make
sure that the currents are verified with an oscilloscope
first, to ensure the integrity of the signal measurement. It
is always a good idea to monitor the A and R
measurements with a scope while you are sweeping it.
To convert the network analyzer data from dBm to
something more useful (such as peak to peak voltage
and current in our case);
dBm
the voltage deviation times the load step;
? V OUT = ? I OUT × Z OUT
The output impedance graph shows the relationship
between supply voltage and output impedance. This is
caused by the lower Rdson of the high side MOSFET
and the increase in gain with increased supply voltages.
This explains why higher supply voltages have better
transient response.
↑ GAIN
? V =
10 10
× 1mW × 50 ? × 2
0 . 707
and peak-to-peak current;
June 2008
16
M9999-062408-A
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