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| 型号： | PRM48BF480T400A00 |
| 元件分类： | 稳压器 |
| 英文描述： | 8.33 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, DMA24 |
| 封装： | ROHS COMPLIANT PACKAGE-24 |
| 文件页数： | 9/22页 |
| 文件大小： | 1097K |
| 代理商： | PRM48BF480T400A00 |
Rev. 1.1
12 / 2010
Page 17 of 22
PRM48BF480T400A00
(Formerly VIP0001TFJ)
VI CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
10.2.2 Setting the output current limit and overcurrent
protection level
The current limit and overcurrent protection set points are
linked, and scale together against the current sense shunt,
and the gain of the current sense amplifier. The output of
the current sense IC provides the IF voltage which has
VIF_IL and VIF_OC thresholds for the two functions
respectively. The set points are therefore defined by:
CS
S
IL
IF
IL
G
R
V
I
_
and
CS
S
OC
IF
OC
G
R
V
I
_
where GCS is the gain of the current sense amplifier.
10.2.3 Control loop compensation requirements
In order to properly compensate the control loop, all
components which contribute to the closed loop frequency
response should be identified and understood. Figure 25
shows the AC small signal model for the module.
Modulator DC gain GPR and powertrain equivalent
resistance rEQ_OUT are shown. These modeling parameters
will support a design cut-off frequency up to 50kHz.
Standard Bode analysis should be used for calculating the
error amplifier compensation and analyzing the closed
loop stability. The recommended stability criteria are as
follows:
1) Phase Margin > 45 : for the closed loop response, the
phase should be greater than 45 where the gain crosses
0dB.
2) Gain Margin > 10dB : The closed loop gain should be
lower than -10dB where the phase crosses 0.
3) Gain Slope = -20dB/decade : The closed loop gain
should have a slope of -20dB/decade at the crossover
frequency.
The compensation characteristics must be selected to
meet these stability criteria. Refer to Figure 27 for a local
sense, voltage-mode control example based on the
configuration in Figure 26. In this example, it is assumed
that the maximum crossover frequency (FCMAX) has been
selected to occur between B and C. Type-2 compensation
(Curve IJKL) is sufficient in this case.
The following data must be gathered in order to proceed:
Modulator Gain GPR: See Figures 17, 18, 19
Powertrain equivalent resistance rEQ: See Figures
17, 18, 19
Internal output capacitance: see Figure 20
External output capacitance value
In the case of ceramic capacitors, the ESR can be
considered low enough to push the associated zero well
above the frequency of interest. Applications with high
ESR
capacitor
may
require
a
different
type
of
compensation, or cascade control.
The system poles and zeros of the closed loop can then
be defined as follows:
Powertrain pole, assuming the external capacitor
ESR can be neglected:
LOAD
OUT
EQ
LOAD
OUT
EQ
C
R
r
R
r
R
EXT
OUT
_
Main pole frequency:
EXT
OUT
INT
OUT
LOAD
OUT
EQ
LOAD
OUT
EQ
P
C
R
r
R
r
_
C
π
2
1
F
Compensation Mid-Band Gain:
1
3
MB
R
log
20
G
[1]
Compensation Zero:
1
3
1
Z
C
R
π
2
1
F
[2]
Compensation Pole:
2
1
2
1
3
2
π
2
1
F
C
R
P
and for FP2>>FZ1 (C1 + C2 ≈ C1):
2
3
2
1
F
C
R
P
[3]
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PRM48BF480T400B00 | 功能描述:REGULATOR PRM 48V OUT 400W SMD 制造商:vicor corporation 系列:VI Chip? PRM? 包装:散装 零件状态:有效 类型:预稳模块 输出数:1 电压 - 输入（最小值）:38V 电压 - 输入（最大值）:55V 电压 - 输出 1:48V 电压 - 输出 2:- 电压 - 输出 3:- 电流 - 输出（最大值）:11A 功率（W） - 制造系列:400W 电压 - 隔离:- 应用:ITE（商业） 特性:OCP，OTP，OVP，SCP，UVLO 安装类型:表面贴装 封装/外壳:模块 大小/尺寸:1.28" 长 x 0.87" 宽 x 0.26" 高（32.5mm x 22.0mm x 6.7mm） 工作温度:-40°C ~ 125°C 效率:97% 功率（W） - 最大值:400W 标准包装:40 |
| PRM48BF480T500A00 | 制造商:Vicor Corporation 功能描述:REGULATOR PRM 48V 10.42A 500W |
| PRM48BF480T600A00 | 功能描述:REGULATOR PRM 48V OUT 600W SMD 制造商:vicor corporation 系列:VI Chip? PRM? 包装:散装 零件状态:有效 类型:预稳模块 输出数:1 电压 - 输入（最小值）:38V 电压 - 输入（最大值）:55V 电压 - 输出 1:48V 电压 - 输出 2:- 电压 - 输出 3:- 电流 - 输出（最大值）:12.5A 功率（W） - 制造系列:600W 电压 - 隔离:- 应用:ITE（商业） 特性:OCP，OTP，OVP，SCP，UVLO 安装类型:表面贴装 封装/外壳:模块 大小/尺寸:1.28" 长 x 0.87" 宽 x 0.26" 高（32.5mm x 22.0mm x 6.7mm） 工作温度:-40°C ~ 125°C 效率:97.6% 功率（W） - 最大值:600W 标准包装:40 |
| PRM48BH480M250A00 | 制造商:VICOR 制造商全称:Vicor Corporation 功能描述:PRMa?￠ Regulator |
| PRM48BH480T200A00 | 功能描述:HALF-CHIP PRM REGULATOR 48V 200W RoHS:是 类别:电源 - 板载 >> DC DC 转换器（分解式） 系列:V-I Chip™, PRM™ 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） |
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