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| 型号： | LTC3415EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 7A 38QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 7A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 38-QFN（5x7） |
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LTC3415
OPERATION
In multiphase operation where all the I TH pins of each
LTC3415 are tied together to achieve accurate load sharing,
internal compensation is not allowed. External compensa-
tion components need to be properly selected for optimal
transient response and stable operation.
Master/Slave Operation
In multiphase single-output operation, the user has the
option to run in multi-master mode where all the V FB , I TH ,
and output pins of the stages are tied to each other. All
the error ampli?ers are effectively operating in parallel and
the total g m of the system is increased by the number of
stages. The I TH value, which dictates how much current
is delivered to the load from each stage, is averaged and
smoothed out by the external I TH compensation compo-
nents. However, in certain applications, the resulting higher
g m from multiple LTC3415s can make the system loop
harder to compensate. In this case, the user can choose
an alternative mode of operation.
The second mode of operation is single-master operation
where only the error ampli?er of the master stage is used
while the error ampli?ers of the other stages (slaves) are
disabled. The slave’s error ampli?er is disabled by tying
its V FB pin to SV IN , which also disables the internal over-
voltage comparator and power-good indicator. The master’s
error ampli?er senses the output through its V FB pin and
drives the I TH pins of all the stages. To account for ground
–10
voltage differences among the stages, the user should
tie all I THM pins together and then tie it to the master’s
signal ground. As a result, not only is it easier to do loop
compensation, this single-master operation should also
provide for more accurate current sharing among stages
because it prevents the error ampli?er’s output (I TH ) of
each stage from interfering with that of another stage.
Spread Spectrum Operation
Switching Regulators can be particularly troublesome
where electromagnetic interference (EMI) is concerned.
Switching regulators operate on a cycle-by-cycle basis to
transfer power to an output. In most cases, the frequency
of operation is ?xed or is a constant based on the output
load. This method of conversion creates large components
of noise at the frequency of operation (fundamental) and
multiples of the operating frequency (harmonics).
To reduce this noise, the LTC3415 can run in spread
spectrum operation by tying the CLKIN pin to SV IN . In
spread spectrum operation, the LTC3415’s internal oscil-
lator is designed to produce a clock pulse whose period
is random on a cycle-by-cycle basis but ?xed between
70% and 130% of the nominal frequency. This has the
bene?t of spreading the switching noise over a range of
frequencies, thus signi?cantly reducing the peak noise.
Figures 7 and 8 show how the spread spectrum feature
of the LTC3415 signi?cantly reduces the peak harmonic
–10
–20
–30
V IN = 5V
V OUT = 1.8V
RBW = 100Hz
–14.1dBm
–20
–30
V IN = 5V
V OUT = 1.8V
RBW = 100Hz
–37.3dBm
–40
–50
–60
–70
–80
–90
–100
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
–40
–50
–60
–70
–80
–90
–100
1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
FREQUENCY (MHz)
3415 F07
FREQUENCY (MHz)
3415 F08
Figure 7. LTC3415’s Output Noise Spectrum Analysis in
Free-Running Constant Frequency Operation
Figure 8. LTC3415’s Output Noise Spectrum Analysis in Spread
Spectrum Operation
3415fa
13
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