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参数资料
| 型号： | MIC2155YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 17/35页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32MLF |
| 特色产品： | MIC2155/6 Buck Control IC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 80% |
| 电源电压： | 4.5 V ~ 14.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 32-VFQFN 裸露焊盘，32-MLF? |
| 包装： | 标准包装 |
| 产品目录页面： | 1091 (CN2011-ZH PDF) |
| 其它名称： | 576-3527-6 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
Micrel, Inc.
Setting the Output Voltage
MIC2155/2156
60
50
40
30
20 Phase
10
200
160
120
80
40
0
Regardless of whether the remote sensing or local
output voltage sensing is used, the output voltage is set
with voltage divider resistors R1 and R4 (Figure 12). The
equation below is used to calculate V OUT .
V OUT = V REF × ? 1 +
0
-10
-20
-30
Magnitude
-40
-80
-120
-160
?
?
R1 ?
R 4 ??
-40 -200
1k 10k 100k 1M 10M
FREQUENCY (Hz)
Figure 11. Remote Sense Amplifier Gain/Phase Plot
A typical remote sense configuration is shown in Figure
12. The output of the remote sense amplifier feeds a
voltage divider (R1, R4), which is connected to the
Channel 1 error amplifier. The divider and compensation
network for the remote sense are the same as for a local
sense configuration. The 10 ? resistors provide an
alternate feedback path if the remote sense connections
are removed or opened. The remote sense connections
should not be shorted or the output voltage will increase
close to V IN . The OVP circuit in the controller will not
protect against this type of fault since the feedback pin
Where:
V REF = 0.7V
Current Limit and Overcurrent Protection
The MIC2155/6 uses the synchronous (low-side)
MOSFETs R DSON to sense an over current condition. The
low-side MOSFET is used because it displays lower
parasitic oscillations after switching then the upper
MOSFET. Additionally, it improves the accuracy and
reduces false tripping at lower voltage outputs and
narrow duty cycles since the off-time increases as duty
cycle decreases.
voltage will be 0V.
MIC2155/6
V IN
+SENSE
200μA
HSD
CS1
Q1
R CS
–I L × R DSON
I L
LOAD
–SENSE
Current Limit
LSD
Q2
I L
L1
C O
Figure 13. Overcurrent Circuit
Inductor current flows from the lower MOSFET source to
the drain during the off-time. The drain voltage becomes
negative with respect to ground as the inductor current
continues to flow from Source to Drain. This negative
voltage is proportional to instantaneous inductor current
times the MOSFET R DSON . The voltage across the low-
side FET becomes even more negative as the output
current increases. The overcurrent circuit operates by
Figure 12. Remote Sense
passing a known fixed current source (200μA) through a
resistor R CS . This sets up an offset voltage (I CS × R CS )
that is compared to the VDS of the low-side FET. When
I SD (Source to Drain current) × I L is equal to this voltage,
the MIC2155’s over current trigger is set, which disables
the next high side gate drive pulse. After missing the
high side pulse, the overcurrent (OC) trigger is reset. If
on the next low-side drive cycle, the current is still too
high i.e. V CS is ≤ 0V, another high side pulse is missed
and so on. This effectively reduces the overall energy
transferred to the output and V OUT starts to fall.
November 2009
17
M9999-111209-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2156 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Two-Phase, Single-Output, PWM Synchronous Buck Control IC |
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