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| 型号： | MIC2155YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 28/35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 |
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Micrel, Inc.
The snubber capacitor, C S , is charged and discharged
each switching cycle. The energy stored in C S is
dissipated by the snubber resistor, R S , two times per
switching period. This power is calculated in the
equation below:
P SNUBBER = f S × C S × V IN 2
Where:
f S is the switching frequency for each phase
V IN is the DC input voltage
Compensation of the Output Voltage Loop
The voltage regulation, filter and power stage section is
shown in Figure 24. The error amplifier for Channel 1 is
used to regulate the output voltage and compensate the
MIC2155/2156
Compensation is necessary to insure the control loop
has adequate bandwidth and phase margin to properly
respond to input voltage and output current transients.
High gain at DC and low frequencies is needed for
accurate output voltage regulation. Attenuation near the
switching frequency prevents switching frequency noise
from interfering with the control loop.
For this analysis, the LC filter in the two phase design is
combined into one. The inductances are in parallel and
the output capacitance is the total sum of all C OUT . The
ESR is the parallel combination of all ESRs. The output
load is represented by a resistor R.
The output filter contains a complex double pole formed
by the capacitor and inductor and a zero from the output
capacitor and it’s ESR. The transfer function of the filter
is:
1 +
+ ?
?
voltage regulation loop. It is a voltage output op amp that
is designed to use type III (PID) compensation. Type III
compensation has two compensating zeros, two poles
and a pole at the origin. The figure also shows the
transfer function for each section.
Gfilter ( s ) =
1 +
s
ω z
2 × Q × ω o ? ω o ?
s ? s ?
2
Where:
ω z =
ω o =
1
C O × Re sr
1
C O × L O
E/A
C1
Q = R ×
C O
L
R2
C2
Modulator
V IN
R3
R1
C3
Q1
L1 || L2
Filter
Driver
R4
V REF = 0.7V
Q2
C O
R ESR
R
Figure 24. Voltage Loop and Transfer Functions
November 2009
28
M9999-111209-B
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相关代理商/技术参数 |
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|---|---|
| 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 |
| MIC2156YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2-Phase, Single Output, PWM Synchronous Buck Control IC |
| MIC2156YML TR | 功能描述:DC/DC 开关控制器 Single Output, PWM Sync Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2156YML-TR | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 32-MLF? (5x5) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:2 输出阶段:2 电压 - 电源（Vcc/Vdd）:4.5 V ~ 14.5 V 频率 - 开关:300kHz 占空比（最大）:0.8 同步整流器:是 时钟同步:是 串行接口:- 控制特性:限流，使能，电源良好，软启动 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:32-VFQFN 裸露焊盘，32-MLF? 供应商器件封装:32-MLF?（5x5） 标准包装:1 |
| MIC2159 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:SYNCHRONOUS-itty⑩ Step-Down Converter IC |
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