參數(shù)資料
型號(hào): IRU3146CF
廠商: International Rectifier
英文描述: DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART
中文描述: 雙同步PWM控制器,帶有均流電路和自動(dòng)重新啟動(dòng)
文件頁(yè)數(shù): 16/30頁(yè)
文件大?。?/td> 528K
代理商: IRU3146CF
16
Rev. 1.1
6/25/04
IRU3146
www.irf.com
From (20), 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:
When using the DCR of inductors as current sense ele-
ment, replace
R
S1
in equation (21) with DCR value of in-
ductor.
H(Fo) =
g
m
×
R
S1
×
R
2
×
V
2
π×
Fo
×
L
2
×
V
OSC
IN
- V
OUT
R
2
= 1
×
2
π ×
F
O2
×
L
2
×
V
OSC
g
m
×
R
S1
V
IN
- V
OUT
F
LC(SLAVE)
=
1
2
π
L
2
×
C
OUT
Fz =F
LC(SLAVE)
2
C
2
= 2
π
×
R
2
×
Fz
1
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 by placing the power components. Make all the
connections in the top layer with wide, copper filled ar-
eas. The inductor, output capacitor and the MOSFET
should be as close to each other as possible. This helps
to reduce the EMI radiated by the power traces due to
the high switching. Place input capacitor near to the
drain of the high-side MOSFET.
The layout of driver section should be designed for a low
resistance (a wide, short trace) and low inductance (a
wide trace with ground return path directly beneath it),
this directly affects the driver's performance.
To reduce the ESR, replace the one input capacitor with
two parallel ones. The feedback part of the system should
be kept away from the inductor and other noise sources
and must be placed close to the IC. In multilayer PCB's,
use one layer as power ground plane and have a sepa-
rate control circuit ground (analog ground), to which all
signals are referenced. The goal is to localize the high
current paths to a separate loops 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.
Select a zero crossover frequency for control loop (F
O2
)
1.25 times larger than zero crossover frequency for volt-
age loop (F
O1
):
---(21)
F
o2
1.25%xF
01
Figure18- Case Temperature versus Switching Frequency at Room Temperature
Test Condition: Vin=Vcl=Vch1=Vch2=12V, Capacitors used as loads for output
drivers.
Switching Frequency vs. Case Temp
30
40
50
60
70
80
90
200
300
400
500
600
700
Freq (KHz)
C
100pF
1000pF
1800pF
3300pF
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