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參數資料
| 型號： | RT8800PS |
| 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： | 18/26頁 |
| 文件大?。?/td> | 546K |
| 代理商： | RT8800PS |
RT8800/B
18
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
R
ICOMMON2
≤
85.8k
Ω
Choose R
ICOMMON2
= 82k
Ω
Assume the negative inductor valley current is
5A at no
load, then for
R
ICOMMON1
= 330
Ω
, R
AD
J
= 160
Ω,
V
OUT
= 1.300
ICOMMON1
L
ICOMMON2
L
ICOMMON2
OUT
V
ICOMMON1
L
ICOMMON2
L
OUT
R
ICOMMON1
L
ICOMMON2
ICOMMON
V
X
R
DCR
I
R
DCR
I
R
R
DCR
I
DCR
I
V
R
DCR
I
R
I
×
+
×
+
=
×
+
×
+
=
×
+
=
ICOMMON1
L
ICOMMON2
ICOMMON
V
R
DCR
I
R
×
≥
Ω
Ω
×
≥
330
1m
5A
R
1.3V
ICOMMON2
-
if GM holds input voltages equal, then
V
ISPX
= V
ICOMMON
For the lack of sinking capability of GM, R
ICOMMON2
should
be small enough to compensate the negative inductor
valley current especially at light loads.
For load line design, with application circuit in Figure 15,
it can eliminate the dead zone of load line at light loads.
V
ISPX
= V
OUT
+I
L
x DCR
Figure 15. Application circuit of GM
Current Balance
RT8800/B senses the inductor current via inductor
’
s DCR
for channel current balance and droop tuning. The
differential sensing GM amplifier converts the voltage on
the sense component (can be a sense resistor or the
DCR of the inductor) to current signal into internal balance
circuit.
The current balance circuit sums and averages the current
signals and then produces the balancing signals injected
to pulse width modulator. If the current of some power
channel is larger than average, the balancing signal
reduces that channels pulse width to keep current balance.
The use of single GM amplifier via time sharing technique
to sense all inductor currents can reduce the offset errors
and linearity variation between GMs. Thus it can greatly
improve signal processing especially when dealing with
such small signal as voltage drop across DCR.
Voltage Reference for Converter Output & Load Droop
The positive input of error amplifier is PI pin that sinks
current proportional to the sum of converter output current.
V
DRP
= 2I
SINK
x R
DRP
. The load droop proportional to load
current can be set by the resistor between PI pin & external
V
DACQ
produced by either buffer amplifier or other voltage
source. The PI pin voltage should be larger than 0.8V for
good droop circuit performance.
Figure 16
Load Line without dead zone at light loads
1.31
1.23
1.24
1.25
1.26
1.27
1.28
1.29
1.3
0
5
10
15
20
25
I
OUT
(A)
V
C
R
ICOMMOM2
open
R
ICOMMON2
= 82k
L
DCR
ESR
R
ICOMMON1
GMx
Ix
+
-
R
ICOMMON2
V
ISPX
V
ICOMMON
V
C
C
+
-
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