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参数资料
| 型号： | MIC2176-2YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 20/31页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-MSOP |
| 标准包装： | 100 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 93% |
| 电源电压： | 4.5 V ~ 75 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 其它名称： | 576-3757-5 |
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Micrel, Inc.
The input capacitor must be rated for the input current
ripple. The RMS value of input capacitor current is
determined at the maximum output current. Assuming
the peak-to-peak inductor current ripple is low:
MIC2176
less than 20mV. If the feedback voltage ripple is so small
that the g m amplifier and error comparator can’t sense it,
then the MIC2176 will lose control and the output voltage
is not regulated. In order to have some amount of V FB
ripple, a ripple injection method is applied for low output
I CIN(RMS) ≈ I OUT(max) × D × (1 ? D)
The power dissipated in the input capacitor is:
P DISS(CIN) = I CIN(RMS)2 × ESR CIN
(25)
(26)
voltage ripple applications.
The applications are divided into three situations
according to the amount of the feedback voltage ripple:
1. Enough ripple at the feedback voltage due to the
large ESR of the output capacitors.
As shown in Figure 6a, the converter is stable
without any ripple injection. The feedback voltage
ripple is:
Voltage Setting Components
The MIC2176 requires two resistors to set the output
voltage as shown in Figure 5:
Δ V FB(pp) =
R2
R1 + R2
× ESR C OUT × Δ I L (pp)
(29)
where Δ I L(pp) is the peak-to-peak value of the
inductor current ripple.
2. Inadequate ripple at the feedback voltage due to the
small ESR of the output capacitors.
The output voltage ripple is fed into the FB pin
through a feedforward capacitor C ff in this situation,
as shown in Figure 6b. The typical C ff value is
between 1nF and 100nF. With the feedforward
capacitor, the feedback voltage ripple is very close
Figure 5. Voltage-Divider Configuration
to the output voltage ripple:
The output voltage is determined by the equation:
Δ V FB(pp) ≈ ESR × Δ I L (pp)
(30)
V OUT = V FB × (1 +
R1
R2
)
(27)
3. Virtually no ripple at the FB pin voltage due to the
very-low ESR of the output capacitors:
where, V FB = 0.8V. A typical value of R1 can be between
3k ? and 10k ? . If R1 is too large, it may allow noise to be
introduced into the voltage feedback loop. If R1 is too
small in value, it will decrease the efficiency of the power
supply, especially at light loads. Once R1 is selected, R2
can be calculated using:
R2 =
V FB × R1
V OUT ? V FB
(28)
Figure 6a. Enough Ripple at FB
Ripple Injection
The V FB ripple required for proper operation of the
MIC2176 g m amplifier and error comparator is 20mV to
100mV. However, the output voltage ripple is generally
designed as 1% to 2% of the output voltage. For a low
output voltage, such as a 1V, the output voltage ripple is
only 10mV to 20mV, and the feedback voltage ripple is
November 2010
20
M9999-111710-A
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相关代理商/技术参数 |
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|---|---|
| MIC2176-2YMM 5A EV | 功能描述:电源管理IC开发工具 76V Synchronous Buck Controller - Evaluation Board RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MIC2176-2YMM TR | 功能描述:DC/DC 开关控制器 76V Synchronous 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 |
| MIC2176-3 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Wide Input Voltage, Synchronous Buck Controllers Featuring Adaptive On-Time Control |
| MIC2176-3YMM | 功能描述:DC/DC 开关控制器 76V Synchronous 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 |
| MIC2176-3YMM TR | 功能描述:DC/DC 开关控制器 76V Synchronous 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 |
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