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参数资料
| 型号： | IRDC3839 |
| 厂商： | International Rectifier |
| 文件页数： | 23/35页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL REG 6A SUPIRBUCK DC/DC |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 6A |
| 输入电压： | 12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 600kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3839 |
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IR3839MPbF
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 1.41
its asymptotic gain plot
23
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IRDC3840 | 功能描述:电源管理IC开发工具 IR3840 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3840A | 制造商:IRF 制造商全称:International Rectifier 功能描述:USER GUIDE FOR IR3840A EVALUATION BOARD |
| IRDC3840W | 功能描述:电源管理IC开发工具 User Guide IR3840W Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3841 | 功能描述:电源管理IC开发工具 IR3841 SYNC CONV 600kHz EVAL BRD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3841W | 功能描述:电源管理IC开发工具 User Guide IR3841W Eval Brd RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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