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參數(shù)資料
| 型號： | IRU3146CF |
| 廠商： | International Rectifier |
| 英文描述： | DUAL SYNCHRONOUS PWM CONTROLLER WITH CURRENT SHARING CIRCUITRY AND AUTO-RESTART |
| 中文描述： | 雙同步PWM控制器，帶有均流電路和自動重新啟動 |
| 文件頁數(shù)： | 11/30頁 |
| 文件大?。?/td> | 528K |
| 代理商： | IRU3146CF |
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IRU3146
11
Rev. 1.1
6/25/04
www.irf.com
For higher efficiency, low ESR capacitors is recom-
mended.
Choose two Poscap from Sanyo 16TPB47M (16V, 47
μ
F,
70m
) with a maximum allowable ripple current of 1.4A
for inputs of each channel.
Inductor Selection
The inductor is selected based on operating frequency,
transient performance and allowable output voltage ripple.
Low inductor value results to faster response to step
load (high
i/
t) and smaller size but will cause larger
output ripple due to increase of inductor ripple current.
As a rule of thumb, select an inductor that produces a
ripple current of 10-40% of full load DC.
For the buck converter, the inductor value for desired
operating ripple current can be determined using the fol-
lowing relation:
V
IN
- V
OUT
= L
×
t
t = D
×
f
1
S
V
OUT
V
IN
i
L = (V
IN
- V
OUT
)
×
V
V
×
×
f
S
Where:
V
IN
= Maximum Input Voltage
V
OUT
= Output Voltage
i = Inductor Ripple Current
f
S
= Switching Frequency
t = Turn On Time
D = Duty Cycle
OUT
Where:
V
O
= Output Voltage Ripple
i = Inductor Ripple Current
V
O
= 3% of V
O
will result to ESR
(2.5V)
=19.7m
and
ESR
(1.8V)
=16m
ESR
≤
---(8)
I
O
V
O
The Sanyo TPC series, Poscap capacitor is a good choice.
The 6TPC330M, 330
μ
F, 6.3V has an ESR 40m
. Se-
lecting two of these capacitors in parallel for 2.5V out-
put, results to an ESR of
20m
which achieves our
low ESR goal. And selecting four of these capacitors in
parallel for 1.8V output, results to an ESR of
10m
which achieves our low ESR goal.
The capacitors value must be high enough to absorb the
inductor's ripple current.
Power MOSFET Selection
The IRU3146 uses four N-Channel MOSFETs. The se-
lections criteria to meet power transfer requirements is
based on maximum drain-source voltage (V
DSS
), gate-
source drive voltage (V
GS
), maximum output current, On-
resistance R
DS(ON)
and thermal management.
The both control and synchronous MOSFETs must have
a maximum operating voltage (V
DSS
) that exceeds the
maximum input voltage (V
IN
).
Input Capacitor Selection
The 180
0
out of phase will reduce the RMS value of the
ripple current seen by input capacitors. This reduces
numbers of input capacitors. The input capacitors must
be selected that can handle both the maximum ripple
RMS at highest ambient temperature as well as the
maximum input voltage. The RMS value of current ripple
for duty cycles under 50% is expressed by:
For
i
(2.5V)
= 38%(I
O(2.5V)
), then the output inductor will
be:
L
4
= 1.71
μ
H
For
i
(1.8V)
= 30%(I
O(1.8V)
), then the output inductor will
be:
L
3
= 1.7
μ
H
Panasonic provides a range of inductors in different val-
ues and low profile for large currents.
Output Capacitor Selection
The criteria to select the output capacitor is normally
based on the value of the Effective Series Resistance
(ESR). In general, the output capacitor must have low
enough ESR to meet output ripple and load transient
requirements, yet have high enough ESR to satisfy sta-
bility requirements. The ESR of the output capacitor is
calculated
by
the
following
(ESL, Equivalent Series Inductance is neglected)
relationship:
I
RMS
= (I
1
2
D
1
(1-D
1
)+I
2
2
D
2
(1-D
2
)-2I
1
I
2
D
1
D
2
) --- (6)
Where:
I
RMS
is the RMS value of the input capacitor current
D
and D
are the duty cycle for each output
I
and I
are the current for each output
For this application the I
RMS
=4.8A
Choose ETQP6F1R8BFA (1.71
μ
H, 14A, 3.3m
) both
for L
3
and L
4.
For 2-phase application, equation (7) can be used for
calculating the inductors value. In such case the induc-
tor ripple current is usually chosen to be between 10-
40% of maximum phase current.
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