參數(shù)資料
型號(hào)： LTM4601AHVMPV
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PBGA133
封裝： 15 X 15 MM, 2.82 MM HEIGHT, LEAD FREE, LGA-133
文件頁(yè)數(shù)： 4/30頁(yè)
文件大?。?/td> 519K
代理商： LTM4601AHVMPV
LTM4601AHV
12
4601ahvfb
Multiphase operation with multiple LTM4601AHV devices
in parallel will lower the effective output ripple current due
totheinterleavingoperationoftheregulators.Forexample,
each LTM4601AHV’s inductor current in a 12V to 2.5V
multiphase design can be read from the Inductor Ripple
Current versus Duty Cycle graph (Figure 3). The large
ripple current at low duty cycle and high output voltage
can be reduced by adding an external resistor from fSET to
ground which increases the frequency. If the duty cycle is
DC = 2.5V/12V = 0.21, the inductor ripple current for 2.5V
output at 21% duty cycle is ~6A in Figure 3.
Figure 4 provides a ratio of peak-to-peak output ripple cur-
rent to the inductor current as a function of duty cycle and
the number of paralleled phases. Pick the corresponding
dutycycleandthenumberofphasestoarriveatthecorrect
output ripple current ratio value. If a 2-phase operation is
chosen at a duty cycle of 21%, then 0.6 is the ratio. This
0.6 ratio of output ripple current to inductor ripple of 6A
equals 3.6A of effective output ripple current. Refer to
Application Note 77 for a detailed explanation of output
ripple current reduction as a function of paralleled phases.
The output ripple voltage has two components that are
related to the amount of bulk capacitance and effective
series resistance (ESR) of the output bulk capacitance.
Figure 4. Normalized Output Ripple Current vs Duty Cycle, Dlr = VOT/LI, Dlr = Each Phase’s Inductor Current
DUTY CYCLE (VO/VIN)
0.1 0.15 0.2 0.25
0.35
0.3
0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
4601AHV F04
6-PHASE
4-PHASE
3-PHASE
2-PHASE
1-PHASE
PEAK-TO-PEAK
OUTPUT
RIPPLE
CURRENT
DIr
RA
TIO
=
Figure 3. Inductor Ripple Current vs Duty Cycle
DUTY CYCLE (VOUT/VIN)
0
I L
(A)
2
4
6
8
10
12
0.2
0.4
0.6
0.8
4601AHV F03
2.5V OUTPUT
5V OUTPUT
1.8V OUTPUT
1.5V OUTPUT
1.2V OUTPUT
3.3V OUTPUT WITH
130k ADDED FROM
VOUT TO fSET
5V OUTPUT WITH
100k ADDED FROM
fSET TO GND
applicaTions inForMaTion
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參數(shù)描述
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