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CS5161 Datasheet(PDF) 7 Page - ON Semiconductor

Part No. CS5161
Description  CPU 5?묪it Synchronous Buck Controller
Download  18 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS5161 Datasheet(HTML) 7 Page - ON Semiconductor

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CS5161, CS5161H
http://onsemi.com
7
+
+
+
VCC1
SS
VID0
VID1
VID2
VID3
VID4
VFFB Low
Comparator
VFFB
Fast Feedback
LGnd
Slow Feedback
PWM
Comparator
SS Low
Comparator
SS High
Comparator
5 BIT
DAC
VCC1 Monitor
Comparator
Error
Amplifier
VCC1
VCC2
COFF
VGATE(H)
VGATE(L)
PGnd
FAULT
FAULT
FAULT
Latch
PGnd
R
S
Q
Q
R
S
Q
Q
R
S
Q
Latch
PMW
COFF
One Shot
Off−Time
Timeout
Time−Out
Timer
Edge Triggered
Extended
Off−Time
Timeout
Normal
Off−Time
Timeout
Maximum
On−Time
Timeout
(30 μs)
GATE(H) = ON
GATE(H) = OFF
2.0 μA
60 μA
5.0 V
0.7 V
2.5 V
1.0 V
+
+
+
9.05 V
8.90V
VFB
COMP
Figure 2. Block Diagram
APPLICATIONS INFORMATION
THEORY OF OPERATION
V2 Control Method
The V2 method of control uses a ramp signal that is
generated by the ESR of the output capacitors. This ramp is
proportional to the AC current through the main inductor
and is offset by the value of the DC output voltage. This
control scheme inherently compensates for variation in
either line or load conditions, since the ramp signal is
generated from the output voltage itself. This control
scheme differs from traditional techniques such as voltage
mode, which generates an artificial ramp, and current mode,
which generates a ramp from inductor current.
Figure 3. V2 Control Diagram
COMP
VFFB
Reference
Voltage
+
+
PWM
Comparator
Ramp
Signal
Error
Amplifier
Error
Signal
Output
Voltage
Feedback
VFB
VGATE(H)
VGATE(L)
E
C


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