参数资料
型号: IR3640MPBF
厂商: International Rectifier
文件页数: 20/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 20-MLPQ
标准包装: 100
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.65MHz
占空比: 92%
电源电压: 4.5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 20-VFQFN 裸露焊盘
包装: 管件
IR3640MPBF
To cancel one of the LC filter poles, place the
zero before the LC filter resonant frequency pole:
Z I N
V OUT
C 3
F z = 0 . 75 *
F z = 75 % F LC
1
2 π L o * C o
- -(22)
C 7
R 10
R 8
R 3
C 4
Z f
Using equations (15) and (16) to calculate C4.
One more capacitor is sometimes added in
parallel with C4 and R3. This introduces one
R 9
Fb
E/A
Comp
Ve
more pole which is mainly used to suppress the
switching noise.
The additional pole is given by:
Gain(dB)
V REF
2 π * R 3 * 4
F P =
1
C * C POLE
C 4 + C POLE
H(s) dB
The pole sets to one half of the switching
F Z 1
F Z 2
F P 2
F P 3
Frequency
frequency which results in the capacitor C POLE :
Fig.18: Compensation network with local
feedback and its asymptotic gain plot
C POLE =
1
π * R 3 * F s ?
1
C 4
?
1
π * R 3 * F s
The compensation network has three poles and
two zeros and they are expressed as follows:
F P 1 = 0
V e Z f
F P 2 =
F P 3 =
?
2 π * R 3 ? ?
? ?
F z 1 =
F z 2 =
?
For a general solution for unconditional stability
for any type of output capacitors, in a wide range
of ESR values we should implement local
feedback with a compensation network (type III).
The typically used compensation network for
voltage-mode controller is shown in Fig. 17.
In such configuration, the transfer function is
given by:
= ?
V o Z IN
1
2 π * R 10 * C 7
1 1
? C 4 * C 3 ? 2 π * R 3 * C 3
? C 4 + C 3 ?
1
2 π * R 3 * C 4
1 1
2 π * C 7 * ( R 8 + R 10 ) 2 π * C 7 * R 8
Cross over frequency is expressed as:
*
By replacing Z in and Z f according to Fig. 17, the
transfer function can be expressed as:
F o = R 3 * C 7 *
V in 1
V osc 2 π * L o * C o
Based on the frequency of the zero generated by
? 1 ( 1 + sR 3 C 4 ) * [ 1 + sC 7 ( R 8 + R 10 ) ]
? 1 + sR 3 ? ?
? ? ? * ( 1 + sR 10 C 7 )
H ( s ) =
*
sR 8 ( C 4 + C 3 ) ? ? C 4 * C 3 ? ?
? ? C 4 + C 3 ? ?
the output capacitor and its ESR versus
crossover frequency, the compensation type can
be different. Table 2 below shows the
compensation types and location of the
crossover frequency.
06/15/2009
20
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