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參數(shù)資料
| 型號： | RT8800GS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | General Purpose 2/3-Phase PWM Controller for High-Density Power Supply |
| 中文描述： | 通用2/3-Phase PWM控制器，用于高密度電源 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大小： | 546K |
| 代理商： | RT8800GS |
RT8800/B
17
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
Figure 10. The Linearity of GMx
GM
0
10
20
30
40
50
60
70
0
20
40
60
80
100
V
C
(mV)
I
A
GM1
GM2
GM3
Figure 11 shows the time sharing technique of GM
amplifier. We apply test signal at phase 3 and observe the
waveforms at both pins of GM amplifier. The waveforms
show time sharing mechanism and the perfomance of GM
to hold both input pins equal when the shared time is on.
Figure 11
Time Sharing of GM
Time (1
μ
s/Div)
PWM3
V
ISP3
and
V
I
COMMON
CH1:(2V/Div)
CH2:(50mV/Div)
CH3:(50mV/Div)
V
ISP3
V
ICOMMON
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 12. shows the application circuit of GM
for current ratio requirement. Applying KVL along L+DCR
branch and R1+C//R2 branch:
Look for its corresponding conditions:
Figure 12. Application circuit for current ratio setting
L
C
C
C
C
C
C
L
L
I
x
DCR
R2
+
R1
R2
V
For
V
R2
R2
R1
dt
dV
C
x
R1
=
V
dt
dV
C
R2
V
R1
=
I
x
DCR
+
dt
dI
L
=
+
+
+
+
C
x
(R1//R2)
=
DCR
L
Let
I
x
DCR
+
dt
dI
x
DCR
x
C
x
(R1//R2)
=
I
x
DCR
+
dt
dI
L
L
L
L
L
Figure 13. GM3 Setting for current ratio function
Figure 14. GM1,2 Setting for current ratio function
L
C
I
x
DCR
x
R2
R1
R2
+
V
Then
C
x
(R1//R2)
=
DCR
L
Thus
=
With internal current balance function, this phase would
share (R
1
+R
2
)/R
2
times current than other phases.
Figure 13 &14 show different settings for the power stages.
I
L
1.5uH
1m
3k
1uF
3k
1.5uH
1m
1.5k
1uF
I
L
R2
L
DCR
R1
C
I
L
+
-
V
C
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