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参数资料
| 型号： | IRDC3839 |
| 厂商： | International Rectifier |
| 文件页数： | 22/35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
Where:
? V o = output voltage ripple
? I L = Inductor ripple current
Since the output capacitor has a major role in the
overall performance of the converter and
determines the result of transient response,
selection of the capacitor is critical. The IR3839
can perform well with all types of capacitors.
As a rule, the capacitor must have low enough
ESR to meet output ripple and load transient
requirements.
The goal for this design is to meet the voltage
ripple requirement in the smallest possible
capacitor size. Therefore it is advisable to select
ceramic capacitors due to their low ESR and ESL
and small size. Six of TDK’s C2012X5R0J226M
(22uF, 6.3V, ≈ 3m ? ) capacitors is a good choice.
It is also recommended to use a 0.1μF ceramic
capacitor at the output for high frequency
filtering.
Feedback Compensation
The IR3839 is a voltage mode controller. The
control loop is a single voltage feedback path
including error amplifier and error comparator. To
achieve fast transient response and accurate
output regulation, a compensation circuit is
Fig. 18. Gain and Phase of LC filter
The IR3839 uses a voltage-type error amplifier
with high-gain (110dB) and high-bandwidth
(30MHz). The output of the amplifier is available
for DC gain control and AC phase compensation.
The error amplifier can be compensated either in
type II or type III compensation.
Local feedback with Type II compensation is
shown in Fig. 19.
This method requires that the output capacitor
should have enough ESR to satisfy stability
requirements. If the output capacitor’s ESR
generates a zero at 5kHz to 50kHz, the zero
generates acceptable phase margin and the
Type II compensator can be used.
The ESR zero of the output capacitor is
expressed as follows:
necessary. The goal of the compensation
network is to provide a closed-loop transfer
F ESR ?
1
2 ? π *ESR*C o
.......... .......... ....... (17)
function with the highest 0 dB crossing frequency
and adequate phase margin (greater than 45 o ).
The output LC filter introduces a double pole,
–40dB/decade gain slope above its corner
resonant frequency, and a total phase lag of 180 o
(see figure 18). The resonant frequency of the LC
filter is expressed as follows:
F LC ?
1
2 ? π L o ? C o
.......... .......... .......... .. (16)
Figure 18 shows gain and phase of the LC filter.
Since we already have 180 o phase shift from the
output filter alone, the system runs the risk of
being unstable.
Fig. 19. Type II compensation network
and its asymptotic gain plot
Rev 1.41
22
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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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