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NCP5425DB Datasheet(PDF) 11 Page - ON Semiconductor

Part # NCP5425DB
Description  Dual Synchronous Buck Controller
Download  22 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP5425DB Datasheet(HTML) 11 Page - ON Semiconductor

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NCP5425
http://onsemi.com
11
Inductor Current Sensing
Examples of lossless current sensing across an output
inductor are shown in Figure 8. Lx is the output inductance
and Rx represents its equivalent series resistance. To
compensate the current sense signal, the values of R1 and C1
are chosen so that Lx/Rx = R1 x C1. With these values, the
current sense signal will have the same wave shape as the
inductor current and the voltage signal on C1 will represent
the instantaneous value of inductor current. The voltage
across C1 can be used as though it were a sense resistor with
the same value as the inductor’s ESR, thus avoiding a sense
resistor’s power loss.
Figure 8. Inductor Current Sensing − Circuit Configurations
Lx
Rx
R1
C1
Switch
Node
Rx X IL
+
−
+ls
−ls
_
+
70 mV
Lx
Rx
R1
C1
Switch
Node
Rx*IL*R2
+
−
+ls
−ls
_
+
70 mV
(8A)
(8B)
R2
(R1 + R2)
Lx
Rx
R1
C1
Switch
Node
Rx X IL
+
−
+ls
−ls
_
+
70 mV
(8C)
R3
Lx
Rx
R1
C1
Switch
Node
(Rx*IL) + (ER3)
+
−
+ls
−ls
_
+
70 mV
(8D)
R3
R4
DC
Output
ER3 = (Vo*R3)/R3 + R4)
DC
Output
DC
Output
DC
Output


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