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参数资料
| 型号： | IRDC3840 |
| 厂商： | International Rectifier |
| 文件页数： | 18/32页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK CONVERTER |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | SupIRBuck™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 12A |
| 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： | IR3840 |
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IR3840MPbF
the voltage V c across C6 remains approximately
unchanged and the voltage at the Boot pin
becomes
V Boot ? V in + V cc ? V D .......... .......... .......... .......... (11)
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 ( Δ 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 ?
; Δ t = D ?
Fig. 12. Bootstrap circuit to generate
Vc voltage
Δ i
Δ t
L = ( V in ? V o ) ?
1
F s
V o
V in ? Δ i * F s
.......... .......... .......... . (14)
V o
A bootstrap capacitor of value 0.1uF is suitable
for most applications.
Input Capacitor Selection
The ripple current generated during the on time of
the upper MOSFET should be provided by the
input capacitor. The RMS value of this ripple is
expressed by:
I RMS = I o ? D ? ( 1 ? D ) .......... .......... ....(12)
D = .......... .......... .......... .. (13)
V in
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
If Δ i ≈ 35%( I o ), then the output inductor is
calculated to be 0.607 μ H. Select L =0.6 μ H.
The MPL104-0R6 from Delta provides a compact,
low profile inductor suitable for this application.
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 =12A and D = 0.15, the I RMS = 4.28A.
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 4x10uF 16V ceramic capacitors
ECJ-3YX1C106K from Panasonic. In addition to
these, although not mandatory, a 1X330uF, 25V
SMD capacitor EEV-FK1E331P may also be
used as a bulk capacitor and is recommended if
the input power supply is not located close to the
converter.
.
06/18/09
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| IRDC3842 | 功能描述:电源管理IC开发工具 IR3842 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 |
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