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参数资料
| 型号： | IRDC3856W |
| 厂商： | International Rectifier |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SUPIRBUCK IR3856W |
| 产品培训模块： | SupIRBuck? Family and POL Design Tools Overview |
| 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： | 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： | IR3856W |
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PD-97506
IR3856WMPbF
the voltage Vc across C6 remains approximately
unchanged and the voltage at the Boot pin
becomes
V Boot ? V in + V cc ? V D .......... .......... .......... .......... (11)
Fig. 12. Bootstrap circuit to generate
Vc voltage
A bootstrap capacitor of value 0.1uF is suitable
for most applications.
advisable to have 2x10uF 25V ceramic capacitors
C3216X5R1E106M from TDK. 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.
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 ?
For applications with 21V input voltage, the switch
node may ring above the 25V absolute maximum
voltage rating. To prevent this, in addition to
using best layout practices, it may be necessary
to provide a 10ohm resistor in series with the boot
Δ i
Δ t
L = ( V in ? V o ) ?
1
F s
V o
V in ? Δ i * F s
.......... .......... .......... . (14)
capacitor.
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:
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
I RMS = I o ? D ? ( 1 ? D ) .......... .......... ....(12)
If Δ i ≈ 42%( I o ), then the output inductor is
calculated to be 1.01 μ H. Select L =1 μ H.
D =
V o
V in
.......... .......... .......... .. (13)
The SPM6550T-1R0M from TDK provides a
compact 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 =6A and D = 0.15, the I RMS = 2.14 A.
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
Rev 9.0
19
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相关代理商/技术参数 |
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