参数资料
| 型号： | MIC2166YMME TR |
| 厂商： | Micrel Inc |
| 文件页数： | 20/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM HYBRID 10TSOP |
| 标准包装： | 2,500 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 82% |
| 电源电压： | 4.5 V ~ 28 V |
| 降压： | 无 |
| 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）裸露焊盘 |
| 包装： | 带卷 (TR) |
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Micrel, Inc.
The process of sizing the ripple injection resistor and
capacitors is:
MIC2166
The output voltage is determined by the equation:
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.
V OUT = V REF × (1 +
R1
R2
)
(40)
Step 2. Select R inj according to the expected feedback
voltage ripple. According to the equation (36):
where V REF = 0.8V. If R1 is too large, it may allow noise
to be introduced into the voltage feedback loop. If R1 is
too small, it will decrease the efficiency of the power
K div =
Δ V FB(PP )
V IN
×
f SW × τ
D × ( 1 ? D )
(38)
supply, especially at light loads. The total voltage divider
resistance R1+R2 is recommended to be 7.5k ? . Once
R1 is selected, R2 can be calculated using:
Then the value of Rinj is obtained as:
R2 =
V REF × R1
V OUT ? V REF
(41)
R inj = ( R 1 // R 2 ) × (
1
K div
? 1 )
(39)
In addition to the external ripple injection added at the
FB pin, internal ripple injection is added at the inverting
input of the comparator inside the MIC2166, as shown in
Step 3. Select C inj as 100nF, which could be considered
as short for a wide range of the frequencies.
Setting Output Voltage
The MIC2166 requires two resistors to set the output
Figure 10. The inverting input voltage V INJ is clamped to
1.2V. As V OUT is increased, the swing of V INJ will be
clamped. The clamped V INJ reduces the line regulation
because it is reflected back as a DC error on the FB
terminal. Therefore, the maximum output voltage of the
MIC2166 should be limited to 5.5V to avoid this problem.
voltage, as shown in Figure 8.
Figure 8. Voltage-Divider Configuration
Figure 9. Internal Ripple Injection
September 2010
20
M9999-092410-C
相关PDF资料 |
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| MIC2168AYMM | IC REG CTRLR BUCK PWM VM 10-MSOP |
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| MIC2169BMM TR | IC REG CTRLR BUCK PWM VM 10-MSOP |
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| MIC2168 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:1MHz PWM Synchronous Buck Control IC |
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| MIC2168ABMM | 功能描述:IC REG CTRLR BUCK PWM VM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2168ABMM TR | 功能描述:IC REG CTRLR BUCK PWM VM 10-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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