参数资料
| 型号： | MIC2164YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 20/39页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-MSOP |
| 产品培训模块： | MIC2124 Synchronous Current Mode DC-DC Buck Controller |
| 特色产品： | MIC2164 Buck Regulator |
| 标准包装： | 100 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 375kHz |
| 占空比： | 87% |
| 电源电压： | 3 V ~ 28 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 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-3466-5 |
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Micrel, Inc.
MIC2164/-2/-3/C
In the formula (29) and (30), it is assumed that the time
constant associated with Cff must be much greater than
the switching period:
1
fsw × τ
=
T
τ
<< 1
Figure 5a. Enough Ripple at FB
Figure 5b. Inadequate Ripple at FB
If the voltage divider resistors R1 and R2 are in the k ?
range, a Cff of 1nF to 100nF can easily satisfy the large
time constant consumption. Also, a 100nF injection
capacitor Cinj 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 Cff to feed all output ripples into the
feedback pin and make sure the large time constant
assumption is satisfied. Typical choice of Cff is 1nF to
100nF if R1 and R2 are in k ? range.
Step 2. Select Rinj according to the expected feedback
voltage ripple. According to the equation (30):
K div =
Δ V FB( pp )
V HSD
?
f SW ? τ
D ? ( 1 ? D )
(31)
Then the value of Rinj is obtained as:
Figure 5c. Invisible Ripple at FB
R inj = ( R 1 // R 2 ) ? (
1
K div
? 1 )
(32)
In this situation, the output voltage ripple is less than
20mV. Therefore, additional ripple is injected into the FB
pin from the switching node LX via a resistor Rinj and a
capacitor Cinj, as shown in Figure 5c. The injected ripple
is:
Step 3. Select Cinj as 100nF, which could be considered
as short for a wide range of the frequencies.
Δ V FB(pp) = V HSD × K div × D × (1 - D) ×
1
f SW × τ
(29)
K div =
R1//R2
Rinj + R1//R2
(30)
where
V HSD = Power stage input voltage at HSD pin
D = Duty Cycle
f SW = switching frequency
τ = ( R 1 // R 2 // Rinj ) ? Cff
September 2010
20
M9999-091310-D
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PDF描述 |
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| MIC2165YMME TR | IC REG CTRLR BUCK PWM 10TSOP |
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| MIC2168AYMM | IC REG CTRLR BUCK PWM VM 10-MSOP |
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相关代理商/技术参数 |
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| MIC2164YMM TR | 功能描述:DC/DC 开关控制器 300kHz PWM 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 |
| MIC2165 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Adaptive On-Time DC-DC Controller Featuring Hyper Light Load |
| MIC2165_1011 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Adaptive On-Time DC-DC Controller Featuring HyperLight Load?? |
| MIC2165YMME | 功能描述:DC/DC 开关控制器 DC-DC Controller with PG, Internal LDO & HLL 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 |
| MIC2165YMME TR | 功能描述:DC/DC 开关控制器 DC-DC Controller with PG, Internal LDO & HLL 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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