- 您现在的位置：买卖IC网 > PDF目录14205 > MIC4723YML TR (Micrel Inc)IC REG BUCK ADJ 3A 12MLF PDF资料下载
参数资料
| 型号： | MIC4723YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/20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： | 无 |
| 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.
The following Bode analysis show the small signal loop
stability of the MIC4723, it utilizes type III compensation.
This is a dominant low frequency pole, followed by 2
zeros and finally the double pole of the inductor
capacitor filter, creating a final 20dB/decade roll off.
Bode analysis gives us a few important data points;
speed of response (Gain Bandwidth or GBW) and loop
stability. Loop speed or GBW determines the response
time to a load transient. Faster response times yield
MIC4723
regulator only has the ability to source current. This
means that the regulator has to rely on the load to be
able to sink current. This causes a non-linear response
at light loads. The following plot shows the effects of the
pole created by the nonlinearity of the output drive
during light load (discontinuous) conditions.
Bode Plot
V IN =3.3V,V OUT =1.8V,I OUT =50mA
60 210
smaller voltage deviations to load steps.
50
175
60 IN
210
Instability in a control loop occurs when there is gain and
positive feedback. Phase margin is the measure of how
stable the given system is. It is measured by determining
how far the phase is from crossing zero when the gain is
equal to 1 (0dB).
Bode Plot
V =3.3V, V =1.8V, I =3A
OUT OUT
40
30
20
10 L=1μH
0 C OUT = 4.7μF
-10 R1 = 10k
R2 = 12.4k
-20 C = 82pF
FF
-30
100 1k
PHASE
GAIN
10k 100k
140
105
70
35
0
-35
-70
-105
1M
50
40
30
20
PHASE
175
140
105
70
FREQUENCY (Hz)
3.3Vin, 1.8Vout Iout=50mA;
? Phase Margin=90.5 Degrees
10 L=1μH
35
?
GBW= 64.4KHz
0 C OUT = 4.7μF
-10 R1 = 10k
GAIN
0
-35
Feed Forward Capacitor
R2 = 12.4k
-20 C = 82pF
FF
-30
100 1k 10k 100k
FREQUENCY (Hz)
Typically for 3.3Vin and 1.8Vout at 3A;
-70
-105
1M
The feedback resistors are a gain reduction block in the
overall system response of the regulator. By placing a
capacitor from the output to the feedback pin, high
frequency signal can bypass the resistor divider, causing
a gain increase up to unity gain.
?
Phase Margin=47 Degrees
Gain and Phase
? GBW=156KHz
Gain will also increase with input voltage. The following
graph shows the increase in GBW for an increase in
supply voltage.
vs. Frequency
0
L=1μH
-1 C = 4.7μF GAIN
OUT
-2 R1 = 10k
-3 R2 = 12.4k
-4 C FF = 82pF
25
20
15
60 IN
50
40
Bode Plot
V =5V, V =1.8V, I
OUT OUT
PHASE
=3A
210
175
140
-5
-6
-7
-8
-9
PHASE
10
5
30
105
-10
100
1k
10k 100k
0
1M
20
10 L=1μH GAIN
0 C OUT = 4.7μF
-10 R1 = 10k
R2 = 12.4k
-20 C = 82pF
FF
-30
100 1k 10k 100k
FREQUENCY (Hz)
5Vin, 1.8Vout at 3A load;
?
Phase Margin=43.1 Degrees
?
GBW= 218KHz
70
35
0
-35
-70
-105
1M
FREQUENCY (Hz)
The graph above shows the effects on the gain and
phase of the system caused by feedback resistors and a
feedforward capacitor. The maximum amount of phase
boost achievable with a feedforward capacitor is
graphed below.
Being that the MIC4723 is non-synchronous; the
June 2008
14
M9999-060308-E
相关PDF资料 |
PDF描述 |
|---|---|
| ECM28DSUS | CONN EDGECARD 56POS DIP .156 SLD |
| GBB22DHLR | CONN EDGECARD 44POS .050 DIP SLD |
| GBB25DHNT | CONN EDGECARD 50POS .050 DIP SLD |
| GCB25DHRT | CONN CARD EXTEND 50POS .050" SLD |
| GBB25DHHT | CONN EDGECARD 50POS .050 DIP SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4723YMME | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in epad MSOP-10 Pkg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4723YMME TR | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in epad MSOP-10 Pkg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4723YMMEG11 | 制造商:Micrel 功能描述:The Micrel MIC4723YMMEG11 is a 3A Synchronous Buck Regulator. |
| MIC4724 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:3A 2MHz Integrated Switch Buck Regulator with 6Vmax Input |
| MIC4724YMME | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in Epad MSOP-10 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
发布紧急采购，3分钟左右您将得到回复。