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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)： | 19/26頁 |
| 文件大小： | 546K |
| 代理商： | RT8800GS |
RT8800/B
19
DS8800/B-06 March 2007
www.richtek.com
All brand name or trademark belong to their owner respectively
DAC Offset Voltage Tuning
The Intel specification requires that at no load the nominal
output voltage of the regulator be offset to a value lower
than the nominal voltage corresponding to the V
ID
code.
The offset is tuning from RG in the DAC generator as
Figure 18.
If VID0~6 is set at VSS (Ground), and to suppose that
shunt resistance is Rs.
From below equation, we can tune the value of RG to
increase or decrease the base voltage of V
DACQ
.
REF
S
F
REF
G
F
DACQ
x V
R
R
x V
)
R
R
(1
=
V
+
+
+
-
V
(0.8V)
VDACFB
OP
VDACQ
RF
RG
VID0
VID1
VID2
VID3
VID4
VID5
R
R
R
R
R
R
Figure 18. The Structure of Discrete DAC Generator
Over Current Protection
OCP comparator co\mpares each inductor current sensed
& sample/hold by current sense circuit with this reference
current(150uA). RT8800/B uses hiccup mode to eliminate
fault detection of OCP or reduce output current when
output is shorted to ground.
Figure 19. The Over Current Protection in the interval
CH1:(5V/Div)
CH2:(5V/Div)
Over Current Protection
Time (25ms/Div)
PWM
I
L
Figure 20. Over Current Protection at steady state
CH1:(5V/Div)
CH2:(5V/Div)
Over Current Protection
Time (25ms/Div)
PWM
V
SS
Fault Detection
The
“
hiccup mode
”
operation of over current protection
is adopted to reduce the short circuit current. The in-rush
current at the start up is suppressed by the soft start
circuit through clamping the pulse width and output voltage
by an internal slow rising ramp.
Figure 17. Load Droop Circuit
EA
+
FB
PI
+
-
-
V
DACQ
V
DRP
2xI
X1
2xI
X2
2xI
X3
I
SINK
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| RT8800PQV | General Purpose 2/3-Phase PWM Controller for High-Density Power Supply |
| RT8800PS | General Purpose 2/3-Phase PWM Controller for High-Density Power Supply |
| RT8803A | 2/3-Phase PWM Controller for High-Density Power Supply |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| RT8800PQV | 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 |
| RT8800PS | 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 |
| RT8801 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Multi-Phase PWM Controller for CPU Core Power Supply with Serial Programming Interface |
| RT8801B | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Multi-Phase PWM Controller for K8 CPU Core Power Supply with Serial Programming Interface |
| RT8801BGQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Multi-Phase PWM Controller for K8 CPU Core Power Supply with Serial Programming Interface |
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