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参数资料
| 型号： | IRDC3629A |
| 厂商： | International Rectifier |
| 文件页数： | 12/23页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK CONTROLLER |
| 标准包装： | 1 |
| 系列： | * |
IR3629/IR3629A MPbF
Input Capacitor Selection
The ripple current generated during the on time
of upper the MOSFET should be provided by the
input capacitor. The RMS value of this ripple is
expressed by:
If Δ i ≈ 40 %( I o ) , then the output inductor will be:
L ≈ 0.6uH
The MPL104-0R6 from Delta provides a
compact, low profile inductor suitable for this
application.
I RMS = I o ? D ? ( 1 ? D )
--( 7 )
Where: D = V
V o
in
D is the Duty Cycle
I RMS is the RMS value of the input capacitor
current.
Io is the output current.
For Io=25A and D=0.15, the I RMS =8.9A.
Ceramic capacitors are recommended due to
their peak current capabilities, they also feature
low ESR and ESL at higher frequency which
Output Capacitor Selection
The voltage ripple and transient requirements
determine the output capacitors type 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 be
described as:
Δ V o = Δ V o ( ESR ) + Δ V o ( ESL ) + Δ V o ( C )
Δ V o ( ESL ) = ?
? V in ?
enables better efficiency. However, for the large
pulsing input current at full load, 2x270uF 16V
OS-CON capacitors from Sanyo are
recommended, as well as 2x10uF 16V ceramic
capacitors from Murata.
Δ V o ( ESR ) = Δ I L * ESR
? * ESL
? L ?
- -(9)
Inductor Selection
The inductor is selected based on output power,
operating frequency and efficiency requirements.
Δ V o ( C ) =
Δ I L
8 * C o * F s
; Δ t = D ?
V in ? V o = L ?
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:
s
Δ i 1
Δ t F
Δ V o = Output voltage ripple
Δ I L = Inductor ripple current
Since the output capacitor has a major role in the
overall performance of the converter and
determines the result of transient response,
selection of the capacitor is critical. The IR3629A
can perform well with all types of capacitor.
As a rule, the capacitor must have low enough
ESR to meet output ripple and load transient
requirements.
The goal for this design is to meet the voltage
Where:
L = ( V in ? V o ) ?
V o
V in ? Δ i * F s
--( 8 )
ripple requirement in the smallest possible
capacitor size. Therefore a SP capacitor is
selected due to large capacitance and small size.
Two of the Panasonic SP-CAP EEFSX0D331XE
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
11/29/2007
(330uF, 2V, 6mOhm) is a good choice. In this
case, 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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