参数资料
型号: IR3837MTR1PBF
厂商: International Rectifier
文件页数: 24/36页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 14A PQFN17
产品培训模块: SupIRBuck? Family and POL Design Tools Overview
标准包装: 1
系列: SupIRBuck™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 14.4 V
输入电压: 1.5 V ~ 16 V
PWM 型: 电压模式
频率 - 开关: 225kHz ~ 1.65MHz
电流 - 输出: 14A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 17-VQFN
包装: 标准包装
供应商设备封装: 17-PQFN(5x6)
其它名称: IR3837MTR1PBFDKR
IR3837MPbF
The transfer function ( V e /V out ) is given by:
The additional pole is given by:
2 π * R 3 * 4
V e
V out
? H ( s ) ? ?
Z f
Z IN
? ?
1 ? sR 3 C 4
sR 8 C 4
..... (18)
F P ?
1
C * C POLE
C 4 ? C POLE
.......... .......... .......... ...(24)
H ? s ? ? 3 ......... .......... .......... ......... (19)
F z ?
1
C POLE ?
?
1 1
1
π *R 3 *F s ?
The (s) indicates that the transfer function varies
as a function of frequency. This configuration
introduces a gain and zero, expressed by:
R
R 8
.......... .......... ........ (20)
2 π * R 3 * C 4
First select the desired zero-crossover frequency
( F o ):
F o ? F ESR and F o ? ? 1/5 ~ 1/10 ? * F s ....... (21)
The pole sets to one half of the switching
frequency which results in the capacitor C POLE :
.......... .......... .. (25)
π *R 3 *F s
C 4
For a general solution for unconditional stability
for any type of output capacitors, and a wide
range of ESR values, we should implement local
feedback with a type III compensation network.
The typically used compensation network for
voltage-mode controller is shown in figure 20.
Use the following equation to calculate R3:
Z I N
V OUT
C 3
R 3 ?
V osc * F o * F ESR * R 8
V in * F LC 2
.......... .......... ....... (22)
C 7
R 10
R 8
R 3
C 4
Z f
Where:
V in = Maximum Input Voltage
V osc = Amplitude of the oscillator Ramp Voltage
F o = Crossover Frequency
F ESR = Zero Frequency of the Output Capacitor
F LC = Resonant Frequency of the Output Filter
R 8 = Feedback Resistor
Gain (dB)
R 9
Fb
V REF
E/A
Ve
Comp
To cancel one of the LC filter poles, place the
zero before the LC filter resonant frequency pole:
|H(s)| dB
F z ? 0 . 75 *
F Z 1
F Z 2
F P 2
F P 3
F z ? 75 % F LC
1
2 π L o * C o
.......... .......... .......... ....... (23)
Frequency
Fig.20. Type III Compensation network and
Use equations (20), (21) and (22) to calculate
C4.
One more capacitor is sometimes added in
parallel with C4 and R3. This introduces one
more pole which is mainly used to suppress the
switching noise.
Rev 1.31
its asymptotic gain plot
24
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