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| 型号： | MIC261203YJL EV |
| 厂商： | Micrel Inc |
| 文件页数： | 22/31页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MIC261203YJL |
| 标准包装： | 1 |
| 系列： | HyperLight Load®, SuperSwitcher IIG™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 12A |
| 输入电压： | 5.5 ~ 28 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MIC261203 |
| 其它名称： | 576-4014 |
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Micrel, Inc.
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 22:
MIC261203
K div =
Δ V FB(pp)
V IN
×
f SW × τ
D × (1 - D)
Eq. 21
Figure 7. Voltage-Divider Configuration
R inj = (R1//R2) × (
? 1)
Eq. 22
Then the value of R inj is obtained as:
1
K div
Step 3. Select C inj as 100nF, which could be considered
as short for a wide range of the frequencies.
Setting Output Voltage
The MIC261203 requires two resistors to set the output
voltage as shown in Figure 7.
The output voltage is determined by Equation 23:
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 MIC261203, as shown
in Figure 8. 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 as a DC error on the FB terminal.
Therefore, the maximum output voltage of the
MIC261203 should be limited to 5.5V to avoid this
problem.
V OUT = V FB × (1 +
R1
R2
)
Eq. 23
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, it will
decrease the efficiency of the power supply, especially
at light loads. Once R1 is selected, R2 can be calculated
using:
Figure 8. Internal Ripple Injection
R2 =
V FB × R1
V OUT ? V FB
Eq. 24
July 2011
22
M9999-071311-A
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相关代理商/技术参数 |
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| MIC261203YJLTR | 制造商:Micrel 功能描述:DC DC Regulator 28V 12A 28Pin 5x6mm MLF |
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| MIC261203-ZAYJL TR | 制造商:Micrel Inc 功能描述:IC REG BUCK SYNC ADJ 12A 28MLF |
| MIC2619YD6 | 制造商:Micrel 功能描述:1.2MHz PWM Boost Converter with OVP |
| MIC2619YD6 TR | 功能描述:直流/直流开关转换器 1.2MHz PWM Boost Converter with OVP in Thin SOT-23 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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