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參數(shù)資料
| 型號： | RT8005 |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | 1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter |
| 中文描述： | 第1A，2MHz的，高效率同步降壓PWM變換器 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 201K |
| 代理商： | RT8005 |
RT8005
10
DS8005-08 August 2007
www.richtek.com
Output Capacitor Selection
The capacitor
’
s ESR determines the output ripple voltage
and the initial voltage drop following a high slew-rate
transient
’
s edge. Typically, if the ESR requirement is
satisfied, the capacitance is adequate to filtering. The
output ripple voltage can be calculated as :
Where f
OSC
= operating frequency, C
OUT
= output
capacitance and
I
C
=
I
L
= ripple current in the inductor.
The ceramic capacitor with low ESR value provides the
low output ripple and low size profile. Connect a
2.2
μ
F/4.7
μ
F ceramic capacitor at output terminal for good
performance and place the input and output capacitors as
close as possible to the device.
Layout Considerations
Follow the PCB layout guidelines for optimal performance
of RT8005.
1. For the main current paths as indicated in bold lines in
Figure 1, keep their traces short and wide.
2. Put the input capacitor as close as possible to the device
pins (PVDD and PGND).
3. LX node is with high frequency voltage swing and should
be kept small area. Keep analog components away from
LX node to prevent stray capacitive noise pick-up.
4. Connect feedback network behind the output capacitors.
Keep the loop area small. Place the feedback components
near the RT8005.
5.Connect all analog grounds to a command node and
then connect the command node to the power ground
behind the output capacitors.
6. An example of 2-layer PCB layout is shown in Figure 2
to Figure 3 for reference.
)
f
x
C
x
8
1
(ESR
C
I
V
OSC
OUT
OUT
+
=
Figure 1
Figure 2. Top Layer
Figure 3. Bottom Layer
VDD
LX
GND
RT8005
EN
FB
COMP
L1
C1
V
IN
V
OUT
C2
R4
R1
R2
R5
C4
PVDD
R3
C3
V
IN
PGND
2, 3
4
5
8
1
6
7
9, 10
相關PDF資料 |
PDF描述 |
|---|---|
| RT8005GQV | 1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter |
| RT8005PQV | 1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter |
| RT8008 | 1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter |
| RT8008-10PB | 1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RT8005GQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter |
| RT8005PQV | 制造商:RICHTEK 功能描述:DC/DC (IC) |
| RT8008 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.5MHz,600mA,High Efficiency PWM Step-Down DC/DC Converter |
| RT8008-10PB | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter |
| RT8008-10PJ5 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter |
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