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参数资料
| 型号： | IRDCIP1201-A |
| 厂商： | International Rectifier |
| 文件页数： | 18/29页 |
| 文件大小： | 0K |
| 描述： | BUCK CONV REF DESIGN KIT IP1201 |
| 标准包装： | 1 |
| 系列： | iPOWIR™ |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 1.5V，2.5V |
| 电流 - 输出： | 15A，15A |
| 输入电压： | 3.14 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | iP1201 |
| 相关产品： | IP1201TRPBF-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201PBF-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201TR-ND - IC REG BUCK SYNC ADJ 30A 198BGA IP1201-ND - IC REG BUCK SYNC ADJ 30A 198BGA |
| 其它名称： | *IRDCIP1201-A |
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iP1201
I RMS = 6 x SQRT (0.75(1 - 0.75)) = 2.6A
For better efficiency and low input ripple, select low
ESR ceramic capacitors. The amount of the capaci-
tors is determined based on the r.m.s. rating. In the
above example, a total of 3 x 100 μ F, 3.5A capacitors
will be required to support the input r.m.s. current
(see the parts list in the reference design section of
this datasheet).
The 18 0° out of phase operation of the iP1201 pro-
vides reduced voltage ripple at the input of the de-
vice. This reduction in ripple requires less input by-
pass capacitance. Therefore the input bypass ca-
pacitor selection criteria based on equation (3) pro-
vides a worst case solution for the selected operat-
ing conditions.
Output Capacitor C O Selection
Selection of the output capacitors depends on two
factors:
a. Low effective ESR for ripple and load transient
requirements
To support the load transients and to stay within a
specified voltage dip ? V due to the transients, e.s.r.
selection should satisfy equation (4):
R esr ≤ ? V / I Loadmax (4)
Where,
I Loadmax is the maximum load current.
If output voltage ripple is required to be maintained
at specified levels then, the expression in equation
(5) should be used to select the output capacitors.
R esr ≤ V p-p / I ripple (5)
Where,
V p-p is the single phase peak to peak output voltage
ripple.
I ripple is the inductor current peak-to peak ripple.
If the inductor current ripple I ripple is 30% of I OUT1, the
40mV peak to peak output voltage ripple require-
ment will be met if the total e.s.r. of the output capaci-
tors is less than 11mohms. This will require 3 x
470 μ F POSCAP capacitors (See the parts list in the
reference design section of this datasheet). Addi-
tional ceramic capacitors can be added in parallel
to further reduce the e.s.r. Care should be given to
18
properly compensate the control loop for low output
capacitor e.s.r. values.
When selecting output capacitors, it is important to
consider the overshoot performance of the power
supply. If the amount of capacitance is not adequate,
then, when unloading the output, the magnitude of
the overshoot due to stored inductor energy, and
depending on the speed of the response of the con-
trol loop, can exceed the overvoltage trip threshold
of the iP1201 and can cause undesirable shutdown
of the output. The magnitude of the overshoot should
be kept below 1.125V OUT . To prevent the overshoot
from tripping the output a delay can be added by
installing capacitor C26 as shown in Fig.19.
In paralleled single output configuration, due to 180 °
phase shift, the peak to peak output voltage ripple
will be reduced because of doubling of the ripple
frequency. Also, the resulting ripple current in the
output capacitors will be smaller than the ripple cur-
rent of each channel. There is some cancellation
effect of these current, the magnitude of which de-
pends on the duty cycle.
b. Stability
The value of the output capacitor e.s.r. zero frequency
f esr plays a major role in determining stability. f esr is
calculated by the expression in equation (6).
f esr = 1 / (2 π x R esr x C O ) (6)
Details on how to consider this parameter to design
for stability will be outlined in the control loop com-
pensation section of this datasheet.
Inductor L O Selection
Inductor selection is based on trade-offs between
size and efficiency. Low inductor values result in
smaller sizes, but can cause large ripple currents
and lower efficiency. Low inductor values also ben-
efit the transient performance.
The inductor L o is selected according to equation (7):
L O = V out x (1 - D) / (f sw x I ripple ) (7)
For output 1 of the above example, and for I ripple of
30% of I OUT1 , L O1 is calculated to be 1.1 μ H.
The core must be selected according to the peak of
maximum output current.
A similar calculation can be applied to find an induc-
www.irf.com
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