参数资料
型号: MIC2164-3YMM TR
厂商: Micrel Inc
文件页数: 21/39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
标准包装: 2,500
系列: Hyper Speed Control™
PWM 型: 混合物
输出数: 1
频率 - 最大: 1.25MHz
占空比: 66%
电源电压: 3 V ~ 28 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
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)
Micrel, Inc.
Setting Output Voltage
The MIC2164/-2/-3 requires two resistors to set the
output voltage, as shown in Figure 6:
MIC2164/-2/-3/C
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 MIC2164/-2/-3, as
shown in Figure 7. 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 MIC2164/-2/-3 should be limited to 5.5V to avoid
this problem. If a higher output voltage is required, use
the MIC2176 instead.
Figure 6. Voltage-Divider Configuration
The output voltage is determined by the equation:
V OUT = V REF × (1 +
R1
R2
)
(33)
where V REF = 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 7. Internal Ripple Injection
R2 =
V REF × R1
V OUT ? V REF
(34)
September 2010
21
M9999-091310-D
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