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参数资料
| 型号： | IRDC3839 |
| 厂商： | International Rectifier |
| 文件页数： | 24/35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
Again, the transfer function is given by:
Table 3. Different types of compensators
V e
V out
? H ( s ) ? ?
Z f
Z IN
Compensator
Type
Type II
Type III
F ESR vs F 0
F LC < F ESR < F 0 < F S /2
F LC < F 0 < F ESR
Typical Output
Capacitor
Electrolytic
SP-Cap, Ceramic
By replacing Z in and Z f according to figure 20,
the transfer function can be expressed as:
The higher the crossover frequency is, the
? C * C 3 ? ?
sR 8 ( C 4 ? C 3 ) ? 1 ? sR 3 ? 4 ? ? ( 1 ? sR 10 C 7 )
H ( s ) ?
?
( 1 ? sR 3 C 4 ) ? 1 ? sC 7 ? R 8 ? R 10 ? ?
?
? ?
? ? C 4 ? C 3 ? ?
.... (26)
potentially faster the load transient response will
be. However, the crossover frequency should be
low enough to allow attenuation of switching
noise. Typically, the control loop bandwidth or
crossover frequency ( F o ) is selected such that
F o ? ? 1/5 ~ 1/10 ? * F s
F P 2 ?
1
F P 3 ?
?
1 1
2 π * R 3 ? ?
? ?
F Z 1 ?
1
F Z 2 ?
?
1 1
The compensation network has three poles and
two zeros and they are expressed as follows:
F P 1 ? 0 .......... .......... .......... .......... .......... .......... ......(27)
.......... .......... .......... .......... .......(28 )
2 π * R 10 * C 7
.......... ..... (29)
? C 4 * C 3 ? 2 π * R 3 * C 3
? C 4 ? C 3 ?
.......... .......... .......... .......... .....(30)
2 π * R 3 * C 4
.......... (31)
2 π * C 7 * ( R 8 ? R 10 ) 2 π * C 7 * R 8
Cross over frequency is expressed as:
The DC gain should be large enough to provide
high DC-regulation accuracy. The phase margin
should be greater than 45 o for overall stability.
For this design we have:
V in =12V
V o =1.8V
V osc =1.8V
V ref =0.6V
L o =1.0μH
C o =6x22μF, ESR ≈ 3m ? each
It must be noted here that the value of the
capacitance used in the compensator design
must be the small signal value. For instance, the
small signal capacitance of the 22uF capacitor
used in this design is 12.5uF at 1.8 V DC bias
and 600 kHz frequency. It is this value that must
be used for all computations related to the
V in 1
F o ? R 3 * C 7 *
*
V osc 2 π * L o * C o
.......... .......... .......... .. (32)
compensation. The small signal value may be
obtained from the manufacturer’s datasheets,
design tools or SPICE models. Alternatively, they
may also be inferred from measuring the power
Based on the frequency of the zero generated by
the output capacitor and its ESR, relative to
crossover frequency, the compensation type can
be different. Table 3 shows the compensation
types for relative locations of the crossover
frequency.
Rev 1.41
stage transfer function of the converter and
measuring the double pole frequency F LC and
using equation (16) to compute the small signal
C o .
These result to:
F LC =18.4 kHz
F ESR =4.2 MHz
F s /2 =300 kHz
24
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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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