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| 型号： | IP1206TRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 30A/15A LGA |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 750 |
| 系列： | iPOWIR™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 或 2 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 7.5 V ~ 14.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 600kHz |
| 电流 - 输出： | 30A，15A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 36-BFLGA |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 36-LGA（9.25x15.5） |
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i P1206PbF
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
A low inductor value causes a large ripple
current, resulting in a smaller size, faster
response to a load transient but poor efficiency
and high output noise. Generally, the selection of
inductor value can be reduced to the choice of
Output Capacitor Selection
The voltage ripple and transient requirements
determine the output capacitors types 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
desired maximum ripple current ( Δ i )
in the
be described as:
inductor. The optimum point is usually found
between 20% and 50% ripple of the output
current.
Δ V o = Δ V o ( ESR ) + Δ V o ( ESL ) + Δ V o ( C )
; Δ t = D ?
V in ? V o = L ?
Δ V o ( ESL ) = ? in ? * ESL
For the buck converter, the inductor value for
desired operating ripple current can be
determined using the following relation:
s
Δ i 1
Δ t F
Δ V o ( ESR ) = Δ I L * ESR
? V ?
? L ?
- - - -(11)
L = ( V in ? V o ) ?
V o
V in ? Δ i * F s
- - - - ( 10 )
Δ V o ( C ) =
Δ I L
8 * C o * F s
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
For 2-phase single output application the inductor
ripple current is chosen between 10-40% of
maximum phase current
If Δ i ≈ 12 %( I o ) , then the output inductor will be:
L = 1uH
The Delta MPL105-1R0IR (L 1 =1uH, 25A,
R L1 =2.3mOhm) provides a low profile inductor
suitable for this application.
Use the following equation to calculate C 12 and
Δ V o = Output voltage ripple
Δ I L = Inductor ripple current
Since the output capacitor has a major role in
overall performance of converter and determines
the result of transient response, the selection of
capacitors is critical. The iP1206 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, yet have high enough ESR to
satisfy stability requirements.
The goal for this design is to meet the voltage
ripple requirement in smallest possible capacitor
size. Therefore ceramic capacitors are selected
due to low ESR and small size.
Panasonic ECJ24YB0J107M (4*100uF, 6.3V,
X5R and EIA 1210 case size) are a good choice.
R 12 for current sensing:
R 12 * C 12 =
L 1
R L 1
In the case of tantalum or low ESR electrolytic
capacitors, the ESR dominates the output
voltage ripple, equation (13) can be used to
calculate the required ESR for the specific
voltage ripple.
This results to C 12 =1uF and R 12 =402Ohm
www.irf.com
2/26/2008
19
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