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| 型号： | VTM48EF120M025A00 |
| 厂商： | Vicor Corporation |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | VTM CURRENT MULTIPLIER 12V 25A |
| 应用说明： | Factorized Power Architecture and V-I Chips |
| 标准包装： | 1 |
| 系列： | V-I Chip™, VTM™ |
| 类型： | 变压模块 |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 26V |
| 电压 - 输入（最大）： | 55V |
| 输出电压： | 12V |
| 电流 - 输出（最大）： | 25A |
| 电源（瓦） - 制造商系列： | 300W |
| 电压 - 隔离： | 2.25kV（2250V） |
| 应用： | 商用 |
| 特点： | 具有远程开/关功能 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 模块 |
| 尺寸/尺寸： | 1.28" L x 0.87" W x 0.26" H（32.5mm x 22.0mm x 6.7mm） |
| 包装： | 托盘 |
| 工作温度： | -55°C ~ 125°C |
| 效率： | 96% |
| 电源（瓦特）- 最大： | 300W |
| 重量： | 0.033 磅（14.97g） |
VTM 48 E x 120 y 025A00
12.0 INPUT AND OUTPUT FILTER DESIGN
A major advantage of a SAC TM system versus a conventional
PWM converter is that the former does not require large
functional filters. The resonant LC tank, operated at extreme
high frequency, is amplitude modulated as a function of input
voltage and output current and efficiently transfers charge
through the isolation transformer. A small amount of
capacitance embedded in the input and output stages of the
module is sufficient for full functionality and is key to achieving
high power density.
This paradigm shift requires system design to carefully evaluate
external filters in order to:
1.Guarantee low source impedance.
To take full advantage of the VTM TM module dynamic
response, the impedance presented to its input terminals
must be low from DC to approximately 5 MHz. Input
capacitance may be added to improve transient
performance or compensate for high source impedance.
2.Further reduce input and/or output voltage ripple without
sacrificing dynamic response.
Given the wide bandwidth of the VTM module, the source
response is generally the limiting factor in the overall
system response. Anomalies in the response of the source
will appear at the output of the VTM module multiplied
by its K factor.
3.Protect the module from overvoltage transients imposed
by the system that would exceed maximum ratings and
cause failures.
The V ? I Chip TM module input/output voltage ranges must
not be exceeded. An internal overvoltage lockout function
prevents operation outside of the normal operating input
range. Even during this condition, the powertrain is
exposed to the applied voltage and power MOSFETs must
withstand it.
13.0 CAPACITIVE FILTERING CONSIDERATIONS
FOR A SINE AMPLITUDE CONVERTER TM
It is important to consider the impact of adding input and
output capacitance to a Sine Amplitude Converter on the
system as a whole. Both the capacitance value and the
effective impedance of the capacitor must be considered.
A Sine Amplitude Converter has a DC R OUT value which has
already been discussed in section 11. The AC R OUT of the
SAC contains several terms:
? Resonant tank impedance
? Input lead inductance and internal capacitance
? Output lead inductance and internal capacitance
The values of these terms are shown in the behavioral model in
section 11. It is important to note on which side of the
transformer these impedances appear and how they reflect
across the transformer given the K factor.
The overall AC impedance varies from model to model. For
most models it is dominated by DC R OUT value from DC to
beyond 500 KHz. The behavioral model in section 11 should be
used to approximate the AC impedance of the specific model.
Any capacitors placed at the output of the VTM module reflect
back to the input of the module by the square of the K factor
(Eq. 9) with the impedance of the module appearing in series.
It is very important to keep this in mind when using a PRM TM
regulator to power the VTM module. Most PRM modules have
a limit on the maximum amount of capacitance that can be
applied to the output. This capacitance includes both the PRM
output capacitance and the VTM output capacitance reflected
back to the input. In PRM remote sense applications, it is
important to consider the reflected value of VTM output
capacitance when designing and compensating the PRM
control loop.
Capacitance placed at the input of the VTM module appear to
the load reflected by the K factor with the impedance of the
VTM module in series. In step-down ratios, the effective
capacitance is increased by the K factor. The effective ESR of
the capacitor is decreased by the square of the K factor, but
the impedance of the module appears in series. Still, in most
step-down VTM modules an electrolytic capacitor placed at the
input of the module will have a lower effective impedance
compared to an electrolytic capacitor placed at the output. This
is important to consider when placing capacitors at the output
of the module. Even though the capacitor may be placed at
the output, the majority of the AC current will be sourced from
the lower impedance, which in most cases will be the module.
This should be studied carefully in any system design using a
module. In most cases, it should be clear that electrolytic
output capacitors are not necessary to design a stable,
well-bypassed system.
Rev. 3.1
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
2/2011
Page 13 of 18
v i c o r p o w e r. c o m
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相关代理商/技术参数 |
参数描述 |
|---|---|
| VTM48EF120T025A00 | 功能描述:CONVERTER VTM 12V OUT 25A SMD RoHS:是 类别:电源 - 板载 >> DC DC 转换器（分解式） 系列:V-I Chip™, VTM™ 应用说明:Factorized Power Architecture and V-I Chips 产品培训模块:VI Chip Bus Converter Modules 标准包装:1 系列:V-I Chip™, BCM™ 类型:总线转换器模块 输出数:1 电压 - 输入（最小）:330V 电压 - 输入（最大）:365V 输出电压:12.5V 电流 - 输出（最大）:24A 电源（瓦） - 制造商系列:300W 电压 - 隔离:4.242kV（4242V） 应用:商用 特点:具有远程开/关功能和 UVLO 安装类型:通孔 封装/外壳:模块 尺寸/尺寸:1.28" L x 0.87" W x 0.26" H（32.5mm x 22.0mm x 6.7mm） 包装:托盘 工作温度:-55°C ~ 125°C 效率:95.3% 电源（瓦特）- 最大:300W 重量:0.031 磅（14.06g） |
| VTM48EF240T012A00 | 制造商:Vicor Corporation 功能描述:CONVERT DC/DC VTM 24V 12A SMD |
| VTM48EF320M009A00 | 制造商:Vicor Corporation 功能描述:CONVERT DC/DC VTM 32V 9A SMD |
| VTM48EF320T009A00 | 制造商:Vicor Corporation 功能描述:CONVERT DC/DC VTM 32V 9A SMD |
| VTM48EH015_050A00 | 制造商:VICOR 制造商全称:Vicor Corporation 功能描述:VTMa?￠Current Multiplier |
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