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RT9245GC 数据表(PDF) 13 Page - Richtek Technology Corporation

部件名 RT9245GC
功能描述  Multi-Phase PWM Controller for CPU Core Power Supply
PDF  22 Pages
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT9245GC 数据表(HTML) 13 Page - Richtek Technology Corporation

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RT9245
13
DS9245-06
March 2007
www.richtek.com
Figure 7. Over Current Protection at steady state
Current Ratio Setting
Figure 8. Application circuit for current ratio setting
For some case with preferable current ratio instead of
current balance, the corresponding technique is provided.
Due to different physical environment of each channel, it
is necessary to slightly adjust current loading between
channels. Figure 8 shows the application circuit of GM for
current ratio requirement. Applying KVL along L+DCR
branch and R1+C//R2 branch :
L
2
1
C
C
2
2
1
C
1
C
C
2
C
1
L
L
I
DCR
R
R
R2
V
For
V
R
R
R
dt
dV
C
R
V
)
dt
dV
C
R
V
(
R
I
DCR
dt
dI
L
×
+
=
+
+
=
+
+
=
×
+
Look for its corresponding conditions :
C
(R1//R2)
DCR
L
Let
I
DCR
dt
dI
DCR
C
(R1//R2)
I
DCR
dt
dI
L
L
L
L
L
×
=
×
+
×
×
×
=
×
+
With internal current balance function, this phase would
share (R1+R2)/R2 times current than other phases.
Figure 9 &10 show different settings for the power stages.
Figure 11 shows the performance of current ratio compared
with conventional current balance function in Figure 12.
Figure 9. GM4 Setting for current ratio function
Figure 10. GM1~3 Setting for current ratio function
Figure 11
CH1:(5V/Div)
CH2:(5V/Div)
Over Current Protection
Time (25ms/Div)
PWM
VSS
Current Ratio Function
0
5
10
15
20
25
30
35
0
15
304560
7590
IOUT (A)
IL3
IL4
IL2
IL1
Thus if
C
(R1//R2)
DCR
L
×
=
Then
L
C
I
DCR
R2
R1
R2
V
×
×
+
=



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