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RT8113 датащи(PDF) 16 Page - Richtek Technology Corporation

номер детали RT8113
подробное описание детали  Single Phase VR11.1 PWM Controller with 7-bit VID
PDF  21 Pages
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производитель  RICHTEK [Richtek Technology Corporation]
домашняя страница  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT8113 датащи(HTML) 16 Page - Richtek Technology Corporation

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RT8113
16
DS8113-02 April 2011
www.richtek.com
Output Current Sensing
The RT8113 provides a low input offset current-sense
amplifier (CSA) to monitor the output current. The output
current of CSA (IX) is used for load line control and over-
current protection. In this inductor current sensing
topology, RS and CS must be set according to the equation
below :
Then the output current of CSA will follow the equation
below :
SS
L
= R x C
DCR
(
)
L
OFS-CSA
CSP
S
CSN
X
CSN
I x DCR - V
+ 700n x R
+ R - R
I =
R
Figure 7. Circuit for Current Sensing
L
X
CSN
I x DCR
I =
R
RCSN
RCSP
L
DCR
RS
CS
ISN
ISP
CSA: Current Sense Amplifier
R2
C2
C1
R1
VIN
LGATE
PHASE
UGATE
BOOT
700nA
VOFS_CSA
700nA
+
-
+
-
IX
700nA is a typical value of the CSA input offset current.
VOFS-CSA is the input offset voltage of CSA. VOFS-CSA of
the RT8113 is smaller than +/- 1.5mV. Usually, “VOFS-CSA
+ 700n x (RCSP + RS - RCSN)” is negligible except at very
light load and the equation can be simplified as the equation
below :



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