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參數(shù)資料
| 型號： | IRU3073CQ |
| 廠商： | International Rectifier |
| 英文描述： | SYNCHRONOUS PWM CONTROLLER WITH OVER-CURRENT PROTECTION / LDO CONTROLLER |
| 中文描述： | 同步PWM控制器，帶有過電流保護(hù)/ LDO控制器 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 236K |
| 代理商： | IRU3073CQ |
IRU3073
11
Rev. 1.0
09/17/03
www.irf.com
First select the desired zero-crossover frequency (Fo):
Use the following equation to calculate R
4
:
Where:
V
IN
= Maximum Input Voltage
V
OSC
= Oscillator Ramp Voltage
Fo = Crossover Frequency
F
ESR
= Zero Frequency of the Output Capacitor
F
LC
= Resonant Frequency of the Output Filter
R
5
and R
6
= Resistor Dividers for Output Voltage
Programming
g
m
= Error Amplifier Transconductance
H(s) = g
m
× ×
---(15)
( )
R
1 + sR
C
sC
9
F
LC
= 3.41KHz
R
5
= 1K
R
6
= 2.15K
g
m
= 700
μ
mho
For:
V
IN
= 5V
V
OSC
= 1.25V
Fo = 20KHz
F
ESR
= 12KHz
R
4
= V
× ×
g
V
IN
Fo
F
ESR
OSC
R
5
+ R
6
R
5
1
m
Fo > F
ESR
and F
O
≤
(1/5 ~ 1/10)
×
f
S
For:
Lo = 3.3
μ
H
Co = 660
μ
F
F
Z
75%F
LC
F
Z
0.75
×
1
2
π
L
O
×
C
O
---(19)
F
Z
= 2.5KHz
R
4
= 24K
F
Z
= 1
2
π×
R
4
×
C
9
|H(s=j
×
2
π×
F
O
)| = g
m
×
×
R
4
---(16)
R
5
R
6
×
R
5
V
OUT
Vp=V
REF
R
5
R
6
R
4
C
9
Ve
E/A
F
Z
H(s) dB
Frequency
Gain(dB)
Fb
Comp
C
POLE
Figure 11 - Compensation network without local
feedback and its asymptotic gain plot.
The transfer function (Ve / V
OUT
) is given by:
The (s) indicates that the transfer function varies as a
function of frequency. This configuration introduces a gain
and zero, expressed by:
|H(s)| is the gain at zero cross frequency.
C
9
2590pF; Choose C
9
=2200pF
F
P
=
2
π×
R
4
×
1
C
9
×
C
POLE
C
9
+ C
POLE
C
POLE
=
π×
R
4
×
f
S
-
for F
P
<<f
S
2
1
π×
R
4
×
f
S
1
1
C
9
This results to R
4
=23.14K
Choose R
4
=24K
To cancel one of the LC filter poles, place the zero be-
fore the LC filter resonant frequency pole:
Using equations (17) and (19) to calculate C
9
, we get:
One more capacitor is sometimes added in parallel with
C
9
and R
4
. This introduces one more pole which is mainly
used to suppress the switching noise. The additional
pole is given by:
The pole sets to one half of switching frequency which
results in the capacitor C
POLE:
For a general solution for unconditionally stability for
ceramic capacitor with very low ESR and any type of
output capacitors, in a wide range of ESR values we
should implement local feedback with a compensation
network. The typically used compensation network for
voltage-mode controller is shown in Figure 12.
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