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参数资料
| 型号： | IRDCIP1201-A |
| 厂商： | International Rectifier |
| 文件页数： | 20/29页 |
| 文件大小： | 0K |
| 描述： | BUCK CONV REF DESIGN KIT IP1201 |
| 标准包装： | 1 |
| 系列： | iPOWIR™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 1.5V，2.5V |
| 电流 - 输出： | 15A，15A |
| 输入电压： | 3.14 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | iP1201 |
| 相关产品： | IP1201TRPBF-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201PBF-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201TR-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201-ND - IC REG BUCK SYNC ADJ 30A 198BGA |
| 其它名称： | *IRDCIP1201-A |
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iP1201
3. Place a zero at 75% of f LC to cancel one of the LC
filter poles.
Vout1
R26
C22
C9
f z = 0 . 75 ×
2 π
1
L o × C o
(13)
C21
CC1
4. Calculate C 9 using equations (11) and (13)
R25
R9
FB1
iP1201
Calculation of compensation components for out-
put1, based on the example above yields:
f LC = 4.0kHz
f z = 3.0kHz
f 0 = 20kHz (based on F sw = 200kHz)
f esr = 10kHz, per equation (7) using R esr = 11m ? .
R 5 = 4.5K
C 9 = 12nF
R7
C10
Magnitude(dB)
H(s) dB
VREF
E/A1
The same steps can be used to determine the val-
ues of the compensation components for output2.
FZ1
FZ2
FP2
FP3
Frequency
f p 2 ≈
2 π × R 5 × C opt
C opt =
1
2 π × f p 2 × R 5
f z =
2 π × R 25 × C 21
f p 3 ?
(19)
f z 1 =
(20)
1
f z 2
(22)
f 0 =
× V IN × R 26 × C 21 ×
Sometimes, a pole f p2 is added at half the switching
frequency to filter the switching noise. This is done
by adding a capacitor C opt in Fig.20 from the output of
the error amplifier (CC pin of iP1201) to ground. This
pole is given by equation (14):
1
(14)
C opt is found from equation (15) by rearranging the terms
in equation (14) and by setting f p2 = f sw / 2:
(15)
Type III
Type III compensation scheme allows the use of any
type of capacitors with esr frequency of any range. This
scheme suggests a double pole double zero compen-
sation and requires more components around the er-
ror amplifier to achieve the desired gain and phase
margins. Fig. 21 represents the type III compensation
network for iP1201.
The transfer function of the type III compensator is
given by eqaution (16)
Fig. 21: Typical Type III compensation and its gain
plot
The frequencies of the three poles and the two zeros
of the type III compensation scheme are represented
by the following equations:
f p1 = 0 (17)
1
(18)
1
2 π × R 2 6 × C 22
1
2 π × R 26 × C 9
= (21)
2 π × R 9 × C 21
The crossover frequency f 0 for type III compensation is
represented by equation (22):
1 1
V ramp 2 π × L 0 × C 0
Follow the steps below to determine the feedback loop
compensation component values:
H ( s ) ≈
20
1
sR 9 C 9
×
( 1 + sR 26 C 9 ) × ( 1 + sR 9 C 21 )
( 1 + sR 26 C 22 ) × ( 1 + sR 25 C 21 )
(16)
1. Select a zero db crossover frequency f 0 in the range
of 10% to 20% of the switching frequency f sw.
www.irf.com
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