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參數(shù)資料
| 型號： | NCP5318FTR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two/Three/Four−Phase Buck CPU Controller |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | LQFP-32 |
| 文件頁數(shù)： | 22/31頁 |
| 文件大小： | 384K |
| 代理商： | NCP5318FTR2 |
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NCP5318
http://onsemi.com
22
The following equations will determine the maximum and
minimum currents delivered by the input capacitors:
IC,MAX
ILo,MAX
IIN,AVG
(eq. 8)
IC,MIN
ILo,MIN
IIN,AVG
(eq. 9)
I
Lo,MAX
is the maximum output inductor current:
ILo,MAX
IO,MAX
ILo
2
(eq. 10)
where is the number of phases in operation.
I
Lo,MIN
is the minimum output inductor current:
ILo,MIN
IO,MAX
ILo
2
(eq. 11)
I
Lo
is the peak
to
peak ripple current in the output
inductor of value Lo:
ILo
(VIN
VOUT)
D
(Lo
fSW)
(eq. 12)
For the four
phase converter, the input capacitor(s) RMS
current is then:
ICIN,RMS
[4D
(IC,MIN2
IC,IN2
3
IC,MIN
IC,IN
)
IIN,AVG2
(1
4D)]1 2
(eq. 13)
Select the number of input capacitors (NC
IN
) to provide
the RMS input current (I
CIN,RMS
) based on the RMS ripple
current rating per capacitor (I
RMS,RATED
):
NCIN
ICIN,RMS
IRMS,RATED
(eq. 14)
For a four
phase converter with perfect efficiency ( = 1),
the worst case input ripple
current will occur when the
converter is operating at a 12.5% duty cycle. At this
operating point, the parallel combination of input capacitors
must support an RMS ripple current equal to 12.5% of the
converter’s DC output current. At other duty cycles, the
ripple
current will be less. For example, at a duty cycle of
either 6% or 19%, the four
phase input ripple
current will
be approximately 10% of the converter’s DC output current.
In general, capacitor manufacturers require derating to the
specified ripple
current based on the ambient temperature.
More capacitors will be required because of the current
derating.
5. Input Inductor Selection
The use of an inductor between the input capacitors and
the power source isolates the voltage source and the system
from noise generated by the switching converter, while also
reducing the input current slew rate during load transients.
The worst case input current slew rate will occur during the
first few PWM cycles immediately after a step
load change
is applied as shown in Figure 24. When the load is applied,
the output voltage is pulled down very quickly. Current
through
the
output
inductors
instantaneously, so the initial transient load current is
conducted by the output capacitors. The output voltage will
step downward depending on the magnitude of the output
current (I
O,MAX
), the per capacitor ESR of the output
capacitors (ESR
OUT
) and the number of bulk electrolytic
output capacitors (NB
OUT
) as shown in Figure 24. The
output voltage at full transient load will be:
will
not
change
VOUT,FULL
LOAD
VOUT,NO
LOAD
(eq. 15)
(IO,MAX)
ESROUT
NBOUT
When the control MOSFET (Q1 in Figure 24) turns ON,
the input voltage will be applied to the input terminal of the
output inductor (the SWNODE). At that instant, the voltage
across the output inductor can be calculated as:
VLo
VIN
VIN
VOUT,FULL
LOAD
VOUT,NO
LOAD
ESROUT
NBOUT
(eq. 16)
(IO,MAX)
The differential voltage across the output inductor will
cause its current to increase linearly with time. The slew rate
of this current can be calculated from:
dILo
dt
VLo
Lo
(eq. 17)
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| NCP5318FTR2G | 功能描述:DC/DC 開關(guān)控制器 2/3/4 Phase Buck CPU RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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