參數(shù)資料
型號(hào)： RT8800
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(yè)數(shù)： 16/26頁(yè)
文件大?。?/td> 546K
代理商： RT8800
RT8800/B
16
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
Figure 9 is the test circuit for GM. We apply test signal at
GM inputs and observe its signal process output by PI
pin sinking current. Figure 10 shows the variation of signal
processing of all channels. We observe zero offsets and
good linearity between phases.
ICOMMON1
R
C
X
L
C
V
I
I
DCR
V
C
R
DCR
L
=
×
=
×
=
Current Sensing Setting
RT8800/B senses the current flowing through inductor
via its 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 circuit (see Figure 7).
Figure 7. Current Sense Circuit
L
DCR
R
R
ICOMMON
GMx
I
x
C
+
-
I
L
V
C
+
-
Figure 9. The Test Circuit of GM
PWM Signal & High Side MOSFET Gate Signal
Low Side MOSFET Gate Signal
Inductor Current
Falling Slope = Vo/L
I
L
I
L(AVG)
I
L(S/H)
Figure 8. Inductor current and PWM signal
S
IN
O
IN
V
OFF
OFF
2
O
L(AVG)
L(S/H)
ICOMMON1
V
-
L(S/H)
R
X(S/H)
T
x
)
V
(
=
T
T
x
L
V
I
=
I
DCR
x
I
I
=
In order to maintain the V
DACQ
within 1% tolerance in the
worst case, the total driver current of the DAC regulator
should support up to 40mA. As the design of RT8800/B,
the maximum driving current of the internal OP is 10mA.
As shown in Figure 6, we suggest to add an external
transistor 2N3904 for higher current for V
DAC
regulation.
+
-
V
(0.8V)
VDACFB
OP
PI
43
121
VID0
VID1
VID2
VID3
VID4
VID5
1.34k
645
310
162
81
2.63k
V
CC
Q1
2N3904
VDACQ
Figure 6. Immune circuit against CPU Leakage Current
ICOMMON1
R
S
IN
O
IN
V
O
L(AVG)
X(S/H)
S
DCR
x
2L
T
x
)
V
-
V
(
V
I
I
T
=
period
switching,
for
=
The sensing circuit gets I
feedback.
I
X
is sampled and held just before low side MOSFET turns
off (Figure 8).
ICOMMON1
R
=
L
DCR
ESR
R
ICOMMON1
GMx
I
x
V
C
+
-
V
ISPX
V
ICOMMON
C
+
-
相關(guān)PDF資料
PDF描述
RT8800BGQV General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
RT8800BPQV General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
RT8800BPS General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
RT8800GQV General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
RT8800GS General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RT8800_11 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:General Purpose 2/3-Phase PWM Controller for High-Density Power Supply
RT8800A 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:General Purpose 3-Phase PWM Controller for High-Density Power Supply
RT8800A_11 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:General Purpose 3-Phase PWM Controller for High-Density Power Supply
RT8800AGQV 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:General Purpose 3-Phase PWM Controller for High-Density Power Supply
RT8800APQV 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:General Purpose 3-Phase PWM Controller for High-Density Power Supply
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