- 您现在的位置：买卖IC网 > PDF目录15505 > MIC2174C-1YMM (Micrel Inc)IC REG CTRLR BUCK PWM 10-MSOP PDF资料下载
参数资料
| 型号： | MIC2174C-1YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 19/27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 |
| 标准包装： | 100 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 338kHz |
| 占空比： | 87% |
| 电源电压： | 3 V ~ 40 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： | 576-3642-5 MIC2174C-1YMM-ND |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页
Micrel, Inc.
2. Inadequate ripple at the FB 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 7b. The typical C ff value is
between 1nF and 100nF. With the feedforward
MIC2174/MIC2174C
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 R inj and a
capacitor C inj , as shown in Figure 7c. The injected ripple
is:
capacitor, the FB voltage ripple is very close to the
output voltage ripple:
Δ V FB(pp) = V HSD × K div × D × (1 - D) ×
1
f SW × τ
(37)
Δ V FB(pp) ≈ ESR × Δ I L (pp) (36)
3. Virtually no ripple at the FB pin voltage is due to the
very low ESR of the output capacitors.
where
K div =
R1//R2
R inj + R1//R2
(38)
V HSD = Power stage input voltage at HSD pin
D = Duty Cycle
f SW = switching frequency
τ = (R1//R2//R inj ) × C ff
In the equations (37) and (38), it is assumed that the
time constant associated with C ff must be much greater
than the switching period:
Figure 7a. Enough Ripple at FB
1
f SW × τ
=
T
τ
<< 1
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 consumption. 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
Figure 7b. Inadequate Ripple at FB
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. According to Equation 37:
K div =
Δ V FB(pp)
V HSD
×
f SW × τ
D × (1 ? D)
(39)
Figure 7c. Invisible Ripple at FB
Then the value of Rinj is obtained as:
September 2010
19
R inj = (R1//R2) × (
1
K div
? 1)
(40)
M9999-091310-C
相关PDF资料 |
PDF描述 |
|---|---|
| MIC2166YMME | IC REG CTRLR PWM HYBRID 10-MSOP |
| MIC2164-3YMM | IC REG CTRLR BUCK PWM 10-MSOP |
| MIC2164-2YMM | IC REG CTRLR BUCK PWM 10-MSOP |
| SP6125EK1-L | IC REG CTRLR BUCK PWM VM 6TSOT |
| MIC2164CYMM | IC REG CTRLR BUCK PWM 10-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2174C-1YMM TR | 功能描述:DC/DC 开关控制器 Low Cost 40V 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 |
| MIC2176-1 | 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 |
| MIC2176-1YMM | 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 |
| MIC2176-1YMM 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 |
| MIC2176-2 | 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 |
发布紧急采购，3分钟左右您将得到回复。