- 您现在的位置：买卖IC网 > PDF目录5135 > MAX17482GTL+T (Maxim Integrated Products)IC CTLR PWM DUAL IMVP-6.5 40TQFN PDF资料下载
参数资料
| 型号： | MAX17482GTL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 41/48页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM DUAL IMVP-6.5 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，Intel IMVP-6，IMVP-6.5? |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页当前第41页第42页第43页第44页第45页第46页第47页第48页
Dual-Phase, Quick-PWM Controllers for
IMVP-6+/IMVP-6.5 CPU Core Power Supplies
?
Input-voltage range: The maximum value
(V IN(MAX) ) must accommodate the worst-case high
AC adapter voltage. The minimum value (V IN(MIN) )
must account for the lowest input voltage after drops
BST_
(R BST_ )*
INPUT (V IN )
due to connectors, fuses, and battery selector
switches. If there is a choice at all, lower input volt-
DH_
LX_
C BST_
N H
L
?
ages result in better efficiency.
Maximum load current: There are two values to
consider. The peak load current (I LOAD(MAX) ) deter-
mines the instantaneous component stresses and fil-
tering requirements, and thus drives output
V DD
C BYP
capacitor selection, inductor saturation rating, and
the design of the current-limit circuit. The continuous
load current (I LOAD ) determines the thermal stress-
es and thus drives the selection of input capacitors,
MOSFETs, and other critical heat-contributing com-
DL_
N L
ponents. Modern notebook CPUs generally exhibit
PGND
(C NL )*
?
I LOAD = I LOAD(MAX) x 80%.
For multiphase systems, each phase supports a
fraction of the load, depending on the current bal-
ancing. When properly balanced, the load current is
evenly distributed among each phase:
I LOAD ( PHASE ) = LOAD
(R BST_ )* OPTIONAL—THE RESISTOR LOWERS EMI BY DECREASING THE
SWITCHING NODE RISE TIME.
(C NL )* OPTIONAL—THE CAPACITOR REDUCES LX_ TO DL_ CAPACITIVE
COUPLING THAT CAN CAUSE SHOOT-THROUGH CURRENTS.
Figure 11. Gate Drive Circuit
?
I
η TOTAL
where η TOTAL is the total number of active phases.
Switching frequency: This choice determines the
basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
Alternatively, shoot-through currents can be caused by
a combination of fast high-side MOSFETs and slow low-
side MOSFETs. If the turn-off delay time of the low-side
MOSFETs are too long, the high-side MOSFETs can
turn on before the low-side MOSFETs have actually
turned off. Adding a resistor less than 5 Ω in series with
BST_ slows down the high-side MOSFET turn-on time,
eliminating the shoot-through currents without degrad-
ing the turn-off time (R BST_ in Figure 11). Slowing down
the high-side MOSFET also reduces the LX_ node rise
time, thereby reducing EMI and high-frequency cou-
pling responsible for switching noise.
Multiphase Quick-PWM
Design Procedure
Firmly establish the input-voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
ing frequency and inductor operating point, and the fol-
lowing four factors dictate the rest of the design:
?
input voltage, due to MOSFET switching losses that
are proportional to frequency and V IN 2 . The opti-
mum frequency is also a moving target due to rapid
improvements in MOSFET technology that are mak-
ing higher frequencies more practical.
Inductor operating point: This choice provides
trade-offs between size vs. efficiency and transient
response vs. output noise. Low inductor values pro-
vide better transient response and smaller physical
size, but also result in lower efficiency and higher
output noise due to increased ripple current. The
minimum practical inductor value is one that causes
the circuit to operate at the edge of critical conduc-
tion (where the inductor current just touches zero
with every cycle at maximum load). Inductor values
lower than this grant no further size-reduction bene-
fit. The optimum operating point is usually found
between 20% and 50% ripple current.
______________________________________________________________________________________
41
相关PDF资料 |
PDF描述 |
|---|---|
| 200MXG2200MEFCSN35X45 | CAP ALUM 2200UF 200V 20% SNAP-IN |
| MAX17082GTL+T | IC CTLR PWM DUAL IMVP-6.5 40TQFN |
| HMC13DRAS | CONN EDGECARD 26POS R/A .100 SLD |
| 250VXH1800MEFCSN35X50 | CAP ALUM 1800UF 250V 20% SNAP-IN |
| 250MXG1800MEFCSN35X50 | CAP ALUM 1800UF 250V 20% SNAP-IN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1748EUE | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1748EUE+ | 功能描述:直流/直流开关转换器 Triple-Output TFT LCD DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1748EUE+T | 功能描述:直流/直流开关转换器 Triple-Output TFT LCD DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1748EUE-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1748EUE-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
发布紧急采购，3分钟左右您将得到回复。