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参数资料
| 型号： | IRDC3839 |
| 厂商： | International Rectifier |
| 文件页数： | 21/35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
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
A low inductor value causes large ripple current,
resulting in the smaller size, faster response to a
load transient but poor efficiency and high output
noise. Generally, the selection of the inductor
value can be reduced to the desired maximum
ripple current in the inductor ( ? i ) . The optimum
point is usually found between 20% and 50%
ripple of the output current.
For the buck converter, the inductor value for the
desired operating ripple current can be
determined using the following relation:
V in ? V o ? L ?
; ? t ? D ?
L ? ? V in ? V o ? ?
Fig. 17. Bootstrap circuit to generate
Vc voltage
A bootstrap capacitor of value 0.1uF is suitable
? i
? t
V o
V in ? ? i * F s
1
F s
.......... .......... .......... . (14)
for most applications.
Input Capacitor Selection
The ripple current generated during the on time of
the control FET should be provided by the input
capacitor. The RMS value of this ripple is
expressed by:
Where:
V in ? Maximum input voltage
V o ? Output Voltage
Δ i ? Inductor ripple current
F s ? Switching frequency
Δ t ? Turn on time
D ? Duty cycle
V o
I RMS ? I o ? D ? ( 1 ? D ) .......... .......... ....(12)
D ? .......... .......... .......... .. (13)
V in
Where:
D is the Duty Cycle
I RMS is the RMS value of the input capacitor
current.
Io is the output current.
For I o =6A and D = 0.15, the I RMS = 2.14A.
Ceramic capacitors are recommended due to
their peak current capabilities. They also feature
low ESR and ESL at higher frequency which
enables better efficiency. For this application, it is
advisable to have 2x10uF, 16V ceramic
capacitors, ECJ-3YX1C106K from Panasonic. In
addition to these, although not mandatory, a
1x330uF, 25V SMD capacitor EEV-FK1E331P
If Δ i ≈ 42.5%( I o ), then the output inductor is
calculated to be 1.0 μ H. Select the 1.0uH inductor
from TDK, SPM6550T-1R0M100A, which
provides a compact, low profile inductor suitable
for this application.
Output Capacitor Selection
The voltage ripple and transient requirements
determine the output capacitors type and values.
The criteria is normally based on the value of the
Effective Series Resistance (ESR). However the
actual capacitance value and the Equivalent
Series Inductance (ESL) are other contributing
components. These components can be
described as
? V o ? ? V o ( ESR ) ? ? V o ( ESL ) ? ? V o ( C )
? V o ( ESR ) ? ? I L * ESR
? V ? V o ?
? V o ( ESL ) ? ? in ? * ESL
? I L
may also be used as a bulk capacitor and is
recommended if the input power supply is not
located close to the converter.
Rev 1.41
? V o ( C ) ?
? L ?
8 * C o * F s
.......... .......... ..... (15)
21
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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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