参数资料
型号: LTM4601AHVEV#PBF
厂商: Linear Technology
文件页数: 12/30页
文件大小: 0K
描述: IC DC/DC UMODULE 12A 133-LGA
产品培训模块: Power Module vs. Discrete DC to DC
软件下载: LTM4601AHV Spice Model
产品目录绘图: LTM Series_15x15x2.8
设计资源: DC1414B Design Files
LTM4601AHVEV#PBF Footprint.bxl
特色产品: μModule Products
标准包装: 119
系列: µModule®
类型: 非隔离(POL)
输出数: 1
电压 - 输入(最小): 4.5V
电压 - 输入(最大): 28V
Voltage - Output 1: 0.6 ~ 5 V
电流 - 输出(最大): 12A
安装类型: 表面贴装
封装/外壳: 133-LGA
尺寸/尺寸: 0.59" L x 0.59" W x 0.11" H(15.0mm x 15.0mm x 2.8mm)
包装: 托盘
工作温度: -40°C ~ 85°C
效率: 95%
产品目录页面: 2711 (CN2011-ZH PDF)
LTM4601AHV
APPLICATIONS INFORMATION
Multiphase operation with multiple LTM4601AHV devices
in parallel will lower the effective output ripple current due
to the interleaving operation of the regulators. For example,
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 f SET 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.
12
10
8
6
4
2
0
2.5V OUTPUT
5V OUTPUT
1.8V OUTPUT
1.5V OUTPUT
1.2V OUTPUT
3.3V OUTPUT WITH
130k ADDED FROM
V OUT TO f SET
5V OUTPUT WITH
100k ADDED FROM
f SET TO GND
0 0.2 0.4 0.6 0.8
DUTY CYCLE (V OUT /V IN )
4601AHV F03
Figure 3. Inductor Ripple Current vs Duty Cycle
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
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
duty cycle and the number of phases to arrive at the correct
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.
1-PHASE
2-PHASE
3-PHASE
4-PHASE
6-PHASE
0
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9
DUTY CYCLE (V O /V IN )
4601AHV F04
Figure 4. Normalized Output Ripple Current vs Duty Cycle, Dlr = V O T/L I , Dlr = Each Phase’s Inductor Current
12
For more information www.linear.com/LTM4601AHV
4601ahvfc
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