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参数资料
| 型号： | MIC2155YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 31/35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.
Step 6: Determine the frequency for fp2
This is the high frequency pole, which is useful in
additional attenuation of the switching frequency. It
MIC2155/2156
Based on the amount of gain necessary at the crossover
frequency the mid-band gain and R2 value is calculated
using the following formula:
? fc ?
? fo ?
Vm
should initially be set at half of the switching frequency. If
it is set too low, it will lower the phase margin at the
crossover frequency, making it difficult to achieve the
proper phase margin. If set too high, it will not provide
attenuation of the switching frequency, which could lead
to jitter of the switching waveform or instability under
H × Vin ? fc ? ? fz ?
R 2 = R 1 × G CO
2
G CO = × ? ? × ? ? ×
fz 2
fp 1
certain conditions.
The other component values are calculated as follows:
fp 2 =
fs
2
C 2 =
1
2 × π × fz 1 × R 2
C 3 =
C 3 =
Calculating Error Amplifier Component Values
Once the pole and zero frequencies have been fixed, the
error amplifier’s resistor and capacitor values are
calculated.
R1: This value is chosen first. All other component
1
2 × π × fz 2 × R 1
C 2
2 × π × ( fp 1 × C 2 × R 2 ? 1 )
values are calculated from R1. A value of 10K is
suggested. If R1 is chosen too high, R2 may be very
large and the high impedances could be sensitive to
R 3 =
1
2 × π × fp 2 × C 3
noise. If the remote sense amplifier is used, R1 must be
large enough so than not more than 500μA of current is
drawn from the amplifier.
R2: The value of R2 is determined from the mid-band
gain of the error amplifier. This gain depends on the
frequencies of the poles, zeros and LC filter resonant
frequency.
Compensation of the Current Sharing Loop
The control circuitry for Channel 2 forces the channel’s
output current to match the current in Channel 1. The
Channel 2 error amplifier compares the inductor currents
in the two channels and adjusts the duty cycle of
Channel 2 to control its output current. A block diagram
is shown in Figure 27.
Channel 2
Transconductance E/A
Modulator
V IN
R2
Filter
C2
Q1
RZ1
CZ1
Ramp
Driver
Q2
R L2
L2
Channel 1 I L
R L1
L1
R1
Figure 27. Current Sharing Loop and Transfer Functions
C1
C O
November 2009
31
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 |
| 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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