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| MIC2111B Datasheet, PDF (22/35 Pages) Micrel Semiconductor – High-Performance, Multi-Mode, Step-Down Controller | |||
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Micrel, Inc.
MIC2111B
Application Information
Programming Output Voltage with RS Amplifier
Diagram
The output voltage is set using a resistive voltage divider
from the output of differential amplifier to FB (Figure 10).
For R1, use a 1kΩ to 10kΩ resistor. Choose R4 to set the
output voltage by using Equation 3.
R4
=
R1
Ã



VFB
VOUT â
VFB



Eq. 3
Current Sensing and Current Limit
MIC2111B has differential current-sense input with a
dedicated current-sense amplifier. MIC2111BThe
MIC2111B has current-sense amplifier gain of 30V/V and
uses lossless inductor current sensing. This offers the
advantage of lower power loss and lower cost over using a
discrete resistor in series with the inductor.
The inductor sense circuit is shown in Figure 11. It extracts
the voltage drop across the inductorâs DC winding
resistance.
Where VFB = 0.6V.
Figure 10. Programming Output Voltage
Figure 11. MIC2111B Current Sensing
October 13, 2015
22
Revision 2.1
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