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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MIC2164 датащи(PDF) 21 Page - Micrel Semiconductor |
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MIC2164 датащи(HTML) 21 Page - Micrel Semiconductor |
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21 / 39 page  Micrel, Inc. MIC2164/-2/-3/C September 2010 21 M9999-091310-D Setting Output Voltage 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 VINJ is clamped to 1.2V. As VOUT is increased, the swing of VINJ will be clamped. The clamped VINJ 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. The MIC2164/-2/-3 requires two resistors to set the output voltage, as shown in Figure 6: Figure 6. Voltage-Divider Configuration The output voltage is determined by the equation: ) R2 R1 (1 V V REF OUT + × = (33) Figure 7. Internal Ripple Injection where VREF = 0.8V. A typical value of R1 can be between 3kΩ and 10kΩ. 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: REF OUT REF V V R1 V R2 − × = (34) |
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