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参数资料
| 型号： | MIC2176-1YMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 21/31页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-MSOP |
| 标准包装： | 2,500 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 125kHz |
| 占空比： | 96% |
| 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： | 带卷 (TR) |
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Micrel, Inc.
Figure 6b. Inadequate Ripple at FB
MIC2176
If the voltage divider resistors R1 and R2 are in the k ?
range, a C ff of 1nF to 100nF can easily satisfy the large
time constant requirements. Also, a 100nF injection
capacitor C inj is used in order to be considered as short
for a wide range of the frequencies.
The process of sizing the ripple injection resistor and
capacitors is:
Step 1. Select C ff to feed all output ripples into the
feedback pin and make sure the large time constant
assumption is satisfied. Typical choice of C ff is 1nF to
100nF if R1 and R2 are in k ? range.
Step 2. Select R inj according to the expected feedback
voltage ripple using Equation 24:
K div =
Δ V FB(pp)
V IN
×
f SW × τ
D × (1 ? D)
(34)
Then the value of R inj is obtained as:
Figure 6c. Invisible Ripple at FB
In this situation, the output voltage ripple is less than
R inj = (R1//R2) × (
1
K div
? 1)
(35)
20mV. Therefore, additional ripple is injected into the FB
pin from the switching node SW via a resistor R inj and a
capacitor C inj , as shown in Figure 6c. The injected ripple
is:
Step 3. Select C inj as 100nF, which could be considered
as short for a wide range of the frequencies.
Δ V FB(pp) = V IN × K div × D × (1 - D) ×
1
f SW × τ
(31)
K div =
R1//R2
R inj + R1//R2
(32)
where:
V IN = Power stage input voltage
D = Duty cycle
f SW = Switching frequency
τ = (R1//R2//R inj ) × C ff
In Equations 21 and 22, it is assumed that the time
constant associated with C ff must be much greater than
the switching period:
= << 1
1 T
f SW × τ τ
(33)
November 2010
21
M9999-111710-A
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相关代理商/技术参数 |
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| MIC2176-2 | 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 |
| MIC2176-2YMM | 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 |
| MIC2176-2YMM 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 |
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