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| 型号： | IRPP3624-12A |
| 厂商： | International Rectifier |
| 文件页数： | 12/21页 |
| 文件大小： | 0K |
| 描述： | KIT REF DES 12A 1PH SYNC BUCK |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | POWIR+™ |
| 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： | 10.8 ~ 13.2 V |
| 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： | IR3624，IRF7823，IRF7832Z |
| 相关产品： | IR3624MPBF-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFCT-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IR3624MTRPBFTR-ND - IC REG CTRLR BUCK PWM VM 10-MLPD IRF7832ZTR-ND - MOSFET N-CH 30V 21A 8-SOIC IRF7832Z-ND - MOSFET N-CH 30V 21A 8-SOIC |
IR3624MPBF
Input Capacitor Selection
The input filter capacitor should be selected
based on how much ripple the supply can
tolerate on the DC input line. The ripple current
generated during the on time of upper MOSFET
should be provided by input capacitor. The RMS
value of this ripple is expressed by:
If ? i ≈ 50 %( I o ) , then the output inductor will be:
L = 0.82uH
The ACT STS703 series provides a range of
inductors in different values, low profile suitable
for large currents.
D = o
I RMS = I o ? D ? ( 1 ? D )
Where:
D is the Duty Cycle
--( 7 )
V
V in
Output Capacitor Selection
The voltage ripple and transient requirements
determines the output capacitors types and
values. The criteria is normally based on the
value of the Effective Series Resistance (ESR).
I RMS is the RMS value of the input capacitor
current.
Io is the output current.
For Io=6A and D=0.13, the I RMS =2.0A.
Ceramic capacitors are recommended due to
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 ( ESL ) = ?
? V in ?
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
enhance better efficiency,
Use one 10uF, 25V ceramic capacitor from
Panasonic.
? V o ( ESR ) = ? I L * ESR
? * ESL
? L ?
- -(9)
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
? V o ( C ) =
? I L
8 * C o * F s
; ? t = D ?
V in ? V o = L ?
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 inductor value
can be reduced to 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
desired operating ripple current can be
determined using the following relation:
s
? i 1
? t F
? V o = Output voltage ripple
? I L = Inductor ripple current
Since the output capacitor has major role in
overall performance of converter and determine
the result of transient response, selection of
capacitor is critical. The IR3624 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.
L = ( V in ? V o ) ?
Where:
V o
V in ? ? i * F s
--( 8 )
The goal for this design is to meet the voltage
ripple requirement in smallest possible capacitor
size. Therefore ceramic capacitor is selected due
to low ESR and small size. Two of the Panasonic
V in = Maximum input voltage
V o = Output Voltage
? i = Inductor ripple current
F s = Switching frequency
? t = Turn on time
D = Duty cycle
ECJ2FB0J226M (22uF, 6.3V, X5R and EIA 0805
case size) is a good choice.
In the case of tantalum or low ESR electrolytic
capacitors, the ESR dominates the output
voltage ripple, equation (9) can be used to
calculate the required ESR for the specific
voltage ripple.
12
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