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參數(shù)資料
| 型號： | RT9641B |
| 英文描述： | Triple Linear Regulator Controller Support ACPI Control Interface |
| 中文描述： | 三線性穩(wěn)壓控制器支持ACPI控制接口 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 326K |
| 代理商： | RT9641B |
9
RT9641A/B
Placement of the decoupling and bulk capacitors should
follow a placement reflecting their purpose. As such, the
high-frequency decoupling capacitors (C
HF
) should be
placed as close as possible to the load they are decoupling;
the ones decoupling the controller (C
12V
, C
5VSB
) close to
the controller pins, the one decoupling the load close to
the load connector or the load itself (if embedded). The
bulk capacitance (aluminum electrolytic or tantalum
capacitors) placement is not as critical as the high-
frequency capacitor placement, but having these capacitors
close to the load they serve is preferable.
The only critical small signal component is the soft-start
capacitor, C
SS
. Locate the component close to SS pin of
the control IC and connect to ground though a vias placed
close to the capacitor
's
ground pad. Minimize any leakage
current paths from SS node, since the internal current
source is only 5
μ
A.
A multi-layer printed circuit board is recommended. Figure1
shows the connections of most of the components to the
converter. Note that each individual capacitor could
represent numerous physical capacitors. Dedicate one
solid layer for a ground plane and make all critical
component ground connections through vias placed as
close to the component as possible. Dedicate another
solid layer as a power plane and break this plane into
smaller islands of common voltage levels. Ideally, the power
plane should support both the input power and output
power nodes. Use copper filled polygons on the top and
bottom circuit layers to create power islands connecting
the filtering components (output capacitors) and the loads.
Use the remaining printed circuit layers for small signal
wiring.
Component Selection Guidelines
Output Capacitors Selection
The output capacitors for all outputs should be selected
to allow the output voltage to meet the dynamic regulation
requirements of active state operation (S0, S1). The load
transient for the various microprocessor system's
components may require high quality capacitors to supply
the high slew rate (di/dt) current demands. Thus, it is
recommended that capacitors C
OUT1
and C
OUT2
should be
selected for transient load regulation.
Also, during the transition between active and sleep
states, there is a short interval of time during which none
of the power pass elements are conducting-during this
time the output capacitors have to supply all the output
current. The output voltage drop during this brief period of
time can be approximated with the following formula:
V
OUT
= I
OUT
x (ESR
OUT
+ t
t
/ C
OUT
), where
V
OUT
:output voltage drop
ESR
OUT
: output capacitor bank ESR
I
OUT
: output current during transition
C
OUT
: output capacitor bank capacitance
t
t
: active-to-sleep or sleep-to-active transition time (5
μ
S
typical)
Since the output voltage drop is heavily dependent on the
ESR (equivalent series resistance) of the output capacitor
bank, the capacitors should be chosen to maintain the
output voltage above the lowest allowable regulation level.
Input Capacitors Selection
The input capacitors for an RT9641A/B application must
have sufficiently low ESR so that the input voltage does
not dip excessively when energy is transferred to the output
Figure 1 . Printed Circuit Board Islands
SS
3V3DLSB
3V3DL
5VSB
5VDLSB
5VDL
DLA
VSEN2
DRV2
GND
12V
L
L
L
RT9641A/B
C
IN
C
5VSB
C
12V
C
SS
C
HF1
C
BULK1
C
BULK2
C
BULK2
C
HF3
C
HF2
Q1
Q5
Q4
Q2
Q3
+5V
SB
+12V
IN
V
OUT1
V
OUT2
V
OUT3
+3.3V
IN
ISLAND ON POWAR PLANE LAYER
ISLAND ON CIRCUIT/POWER PLANE LAYER
VIA CONNECTION TO GROUND PLANE
相關PDF資料 |
PDF描述 |
|---|---|
| RT9702 | Power Management/Switchers |
| RT9702A | Power Management/Switchers |
| RT9801A | Power Management/Voltage Dector |
| RT9801B | Power Management/Voltage Dector |
| RT9802A | Power Management/Voltage Dector |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RT9641BCS2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIPLE LINEAR REGULATOR CONTROLLER SUPPORT |
| RT9641BGS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Triple Linear Regulator Controller Support ACPI Control Interface |
| RT9641BPS | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Triple Linear Regulator Controller Support ACPI Control Interface |
| RT9643 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:5 Channel ACPI Regulator with Step-Down DC/DC Controller |
| RT9643_11 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:5 Channel ACPI Regulator with Step-Down DC/DC Controller |
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