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参数资料
| 型号： | LTC3733CUHF-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR BUCK 3PH AMD CPU 38-QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，AMD |
| 输入电压： | 4 V ~ 36 V |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 1.55 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 包装： | 带卷 (TR) |
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LTC3733/LTC3733-1
APPLICATIO S I FOR ATIO
δ = 0.005/ ° C can be used as an approximation for low
voltage MOSFETs.
The Schottky diodes, D1 to D3 shown in Figure 1 conduct
during the dead time between the conduction of the two
So the phase number can be chosen to minimize the input
capacitor size for the given input and output voltages.
In the graph of Figure 6, the local maximum input RMS
capacitor currents are reached when:
large power MOSFETs. This prevents the body diode of the
bottom MOSFET from turning on, storing charge during
the dead time and requiring a reverse recovery period
V OUT
V IN
=
2 k – 1
N
where k = 1 , 2 , ..., N
which could cost as much as several percent in efficiency.
A 2A to 8A Schottky is generally a good compromise for
both regions of operation due to the relatively small
average current. Larger diodes result in additional transi-
tion losses due to their larger junction capacitance.
C IN and C OUT Selection
Input capacitance ESR requirements and efficiency losses
are reduced substantially in a multiphase architecture
because the peak current drawn from the input capacitor
is effectively divided by the number of phases used and
power loss is proportional to the RMS current squared. A
3-stage, single output voltage implementation can reduce
input path power loss by 90%.
In continuous mode, the source current of each top
N-channel MOSFET is a square wave of duty cycle V OUT /V IN .
A low ESR input capacitor sized for the maximum RMS
current must be used. The details of a close form equation
can be found in Application Note 77. Figure 6 shows the
input capacitor ripple current for different phase configu-
These worst-case conditions are commonly used for de-
sign because even significant deviations do not offer much
relief. Note that capacitor manufacturer’s ripple current
ratings are often based on only 2000 hours of life. This
makes it advisable to further derate the capacitor or to
choose a capacitor rated at a higher temperature than re-
quired. Several capacitors may also be paralleled to meet
size or height requirements in the design. Always consult
the capacitor manufacturer if there is any question.
The Figure 6 graph shows that the peak RMS input current
is reduced linearly, inversely proportional to the number N
of stages used. It is important to note that the efficiency
loss is proportional to the input RMS current squared and
therefore a 3-stage implementation results in 90% less
power loss when compared to a single phase design.
Battery/input protection fuse resistance (if used), PC
0.6
0.5
rations with the output voltage fixed and input voltage
varied. The input ripple current is normalized against the
DC output current. The graph can be used in place of
tedious calculations. The minimum input ripple current
can be achieved when the product of phase number and
output voltage, N(V OUT ), is approximately equal to the
0.4
0.3
0.2
0.1
1-PHASE
2-PHASE
3-PHASE
4-PHASE
6-PHASE
input voltage V IN or:
0
0.1
0.2
0.3 0.4 0.5 0.6 0.7
0.8
0.9
V OUT
V IN
=
k
N
where k = 1 , 2 , ..., N – 1
DUTY FACTOR (V OUT /V IN )
3733 F06
Figure 6. Normalized Input RMS Ripple Current
vs Duty Factor for One to Six Output Stages
3733f
16
相关PDF资料 |
PDF描述 |
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| HSM22DSAN | CONN EDGECARD 44POS R/A .156 SLD |
| HMM22DSAN | CONN EDGECARD 44POS R/A .156 SLD |
| LTC3733CUHF-1#TR | IC CTRLR BUCK 3PH AMD CPU 38-QFN |
| LTC3733CUHF-1#PBF | IC CTRLR BUCK 3PH AMD CPU 38-QFN |
| HSM22DSAH | CONN EDGECARD 44POS R/A .156 SLD |
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