参数资料
| 型号： | NCP5380AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 26/28页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SYNC BUCK SGL 32QFN |
| 标准包装： | 5,000 |
| 应用： | 控制器，Intel VR11 |
| 输入电压： | 5V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
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NCP5380, NCP5380A
Set the AC Load Line
Set the Initial Transient
1. Remove the dc load from the circuit and connect a
dynamic load.
2. Connect the scope to the output voltage and set it
to dc coupling mode with a time scale of
100 m s/div.
3. Set the dynamic load for a transient step of about
40 A at 1 kHz with 50% duty cycle.
4. Measure the output waveform (note that use of a
dc offset on the scope may be necessary to see the
waveform). Try to use a vertical scale of
100 mV/div or finer.
5. Do not measure the undershoot or overshoot that
occurs immediately after the step.
Figure 28. Transient Setting Waveform, Load Step
1. With the dynamic load set at its maximum step
size, expand the scope time scale to 2 m s/div to
5 m s/div. This results in a waveform that may have
two overshoots and one minor undershoot before
achieving the final desired value after VDROOP
(see Figure 28).
2. If both overshoots are larger than desired, try the
following adjustments in the order shown.
a. Increase the resistance of the ramp resistor
V DCDRP
Figure 27. AC Load Line Waveform
6. If the difference between V ACDRP and V DCDRP is
more than a couple of millivolts, use Equation 42
to adjust C CS . It may be necessary to try several
parallel values to obtain an adequate one because
there are limited standard capacitor values
available (it is a good idea to have locations for
two capacitors in the layout for this reason).
V ACDRP
C CS(NEW) + C CS(OLD) (eq. 41)
7. Repeat Steps 5 and 6 until no adjustment of C CS is
needed. Once this is achieved, do not change C CS
for the rest of the procedure.
8. Set the dynamic load step to its maximum step size
(but do not use a step size that is larger than
(R RAMP ) by 25%.
b. For V TRAN1 , increase C B or increase the
switching frequency.
c. For V TRAN2 , increase R A by 25% and decrease
C A by 25%.
If these adjustments do not change the response, it is
because the system is limited by the output
decoupling. Check the output response and the
switching nodes each time a change is made to
ensure that the output decoupling is stable.
3. For load release (see Figure 29), if V TRANREL is
larger than the value specified by VR11, a greater
percentage of output capacitance is needed. Either
increase the capacitance directly or decrease the
inductor values. (If inductors are changed,
however, it will be necessary to redesign the
circuit using the information from the spreadsheet
and to repeat all tuning guide procedures).
needed) and verify that the output waveform is
square, meaning V ACDRP and V DCDRP are equal.
9. Ensure that the load step slew rate and the
power ? up slew rate are set to ~150 A/ m s to
250 A/ m s (for example, a load step of 50 A should
take 200 ns to 300 ns) with no overshoot. Some
dynamic loads have an excessive overshoot at
power ? up if a minimum current is incorrectly set
(this is an issue if a VTT tool is in use).
Figure 29. Transient Setting Waveform, Load Release
http://onsemi.com
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相关PDF资料 |
PDF描述 |
|---|---|
| NCP5381AMNR2G | IC BUCK CTLR 2/3/4PHASE 40-QFN |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5380MNR2G | 功能描述:DC/DC 开关控制器 IMVP6.5 BUCK CTRL RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5381 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCP5381A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2/3/4 Phase Buck Controller for VR10 and VR11 Pentium IV Processor Applications |
| NCP5381AMNR2G | 功能描述:DC/DC 开关控制器 2/3/4 PHASE CNTRLR RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| NCP5381MNR2G | 功能描述:DC/DC 开关控制器 ANA 2/3/4 PHSE BUCK CNTLR RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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