參數(shù)資料
型號(hào)： IR3637SPBF
廠商： International Rectifier
英文描述： 1% ACCURATE SYNCHRONOUS PWM CONTROLLER
中文描述： 1％準(zhǔn)確的同步PWM控制器
文件頁(yè)數(shù)： 11/21頁(yè)
文件大?。?/td> 655K
代理商： IR3637SPBF
IR3637SPBF
11
Rev. 1.1
06/16/05
www.irf.com
6)
Place second pole at the ESR zero.
F
P2
= F
ESR
1
2
π ×
C
10
×
F
P2
Check if R
8
>
If R
8
is too small, increase R
7
and start from step 2.
7)
Place second zero around the resonant frequency.
F
Z2
= F
LC
2
π ×
C
10
×
F
Z2
8)
Use equation (1) to calculate R
5
.
V
V
OUT
- V
REF
These design rules will give a crossover frequency ap-
proximately one-tenth of the switching frequency. The
higher the band width, the potentially faster the load tran-
sient speed. The gain margin will be large enough to
provide high DC-regulation accuracy (typically -5dB to -
12dB). The phase margin should be greater than 45 for
overall stability.
Based on the frequency of the zero generated by ESR
versus crossover frequency, the compensation type can
be different. The table below shows the compensation
type and location of crossover frequency.
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.
1
g
m
R
8
=
R
6
= 1
8
R
5
=
×
R
6
Compensator
Type
Type II (PI)
Type III (PID)
Method A
Type III (PID)
Method B
Table - The compensation type and location of zero
crossover frequency.
Location of Zero
Crossover Frequency
(F
O
)
F
LC
< F
ESR
< F
O
< f
S
/2
F
LC
< F
O
< F
ESR
< f
S
/2
F
LC
< F
O
< f
S
/2 < F
ESR
Typical
Output
Capacitor
Electrolytic,
Tantalum
Tantalum,
Ceramic
Ceramic
Detail information is dicussed in application Note AN-
1043 which can be downloaded from the IR Web-Site.
All design should be tested for stability to verify the cal-
culated values.
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