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参数资料
| 型号： | NCV8855BMNR2GEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION NCV8855 ASIC |
| 设计资源： | NCV8855BMNR2GEVB Schematic NCV8855 BOM |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 4，非隔离 |
| 电流 - 输出： | 2.5A |
| 输入电压： | 9 V ~ 18 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 170kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCV8855 |
| 其它名称： | NCV8855BMNR2GEVBOS |
NCV8855
control loop has a gain crossing with ? 20 dB/decade slope
and a phase margin greater than 45 ° .
gain = 0 dB or a gain of 1. In the plot above, the UGB is the
point where the red line crosses the W axis. Goal 2 is to have
the closed loop gain cross 0 dB with a ? 20 dB/decade slope
dB
w Z1 +
1
R 2 @ C 2
w Z2 +
1
R 1 ) R 3 @ C 3
1
w P1 +
C 1 @ C 2
C 1 ) C 2
w P2 +
1
R 3 @ C 3
also known as a ? 1 slope. Goal 3 is to achieve over 45 ° of
phase margin when the gain crosses 0 dB.
These are just goals. Sometimes the crossover frequency
is reduced below 1/10 FSW in order to meet goal 3.
Conversely, some designs will push the crossover frequency
as high as it can (as long as it is below 1/2 FSW) with a
reduce phase margin of 30 ° in order to get a faster transient
response. The only two absolutes are that the crossover
frequency cannot exceed 1/2 FSW and the phase margin has
w
to be greater than 0 ° at crossover. However, a SMPS
operating towards these absolutes will experience sever
ringing before it dampens out.
1
w LC +
L OUT @ C OUT
1
w ESR +
ESR @ C OUT
Error Amplifier
Compensation Network
Modulator Gain
Closed Loop Gain
To achieve the above goals, the following guidelines
should be adopted.
? Place wZ1 at half the resonance of wLC
? Place wZ2 at or around wLC
? Place wP1 at wESR
Figure 27.
To reiterate, there are 3 primary goals to compensating.
Goal 1 is to have a high a unity gain bandwidth (UGB) that
is greater than 1/10 the switching frequency, but less than 1/2
the switching frequency. UGB is also known as the
crossover frequency. This is the point where the closed loop
? Place wP2 at half the switching frequency
Performing these calculations will take some amount of
iterations and bench testing to verify results. However,
ON Semiconductor has developed a tool to speed up the
design process tremendously with great ease and accuracy.
This tool can be downloaded by following the below link.
http://www.onsemi.com/pub/Collateral/COMPCALC.ZIP
http://onsemi.com
21
相关PDF资料 |
PDF描述 |
|---|---|
| NCV8871BSTGEVB | BOARD EVAL NCV8871BST BOOST CTLR |
| NHC-14150 | VALULINE 8" X 8.5" X 1.75" |
| NHC-14151 | VALULINE 8" X 17" X 1.75" |
| NHC-14152 | VALULINE 13" X 17" X 1.75" |
| NHC-14153 | VALULINE 8" X 8.5" X 3.5" |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8870 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887000 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887000D1R2G | 功能描述:低压差稳压器 - LDO Auto Grade Non-Sync Boost Controller RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV887001 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887001D1R2G | 功能描述:低压差稳压器 - LDO Auto Grade Non-Sync Boost Controller RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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