參數(shù)資料
型號(hào)： IRU3047
廠商： International Rectifier
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
中文描述： 雙同步PWM控制器，帶有均流電路和LDO控制器
文件頁(yè)數(shù)： 12/19頁(yè)
文件大小： 141K
代理商： IRU3047
12
Rev. 1.0
09/09/02
IRU3047
www.irf.com
From (19), R
2
can be express as:
Set the zero of compensator to be half of F
LC(SLAVE)
, the
compensator capacitor, C
2
, can be calculated as:
Using equations (20) and (21) we get the following val-
ues for R
2
and C
2
.
C
2
= 1023pF; Choose C
2
= 1000pF
R
2
= 123K; Choose R
2
= 130K
Layout Consideration
The layout is very important when designing high fre-
quency switching converters. Layout will affect noise
pickup and can cause a good design to perform with
less than expected results.
Start to place the power components, make all the con-
nection in the top layer with wide, copper filled areas.
The inductor, output capacitor and the MOSFET should
be close to each other as possible. This helps to reduce
the EMI radiated by the power traces due to the high
switching currents through them. Place input capacitor
directly to the drain of the high-side MOSFET, to reduce
the ESR replace the single input capacitor with two par-
allel units. The feedback part of the system should be
kept away from the inductor and other noise sources,
and be placed close to the IC. In multilayer PCB use
one layer as power ground plane and have a control cir-
cuit ground (analog ground), to which all signals are ref-
erenced. The goal is to localize the high current path to
a separate loop that does not interfere with the more
sensitive analog control function. These two grounds
must be connected together on the PC board layout at a
single point.
---(19)
H(Fo)=g
m
×
R
S1
×
R
2
×
V
IN
- V
OUT
2
π×
Fo
×
L
2
×
V
OSC
R
2
= 1
×
2
π×
F
O2
×
L
2
×
V
OSC
g
m
×
R
S1
V
IN(SLAVE)
- V
OUT
---(20)
F
LC(SLAVE)
=
1
2
π
L
2
×
C
OUT
Fz =F
LC(SLAVE)
2
C
2
= 1
2
π
×
R
2
×
Fz
相關(guān)PDF資料
PDF描述
IRU3047CW DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND LDO CONTROLLER
IRU3048 DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3048CF DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3048CS DUAL SYNCHRONOUS PWM CONTROLLER CIRCUITRY AND LDO CONTROLLER
IRU3072C 20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER
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