参数资料
| 型号： | NCP5380AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/28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
Reverse Voltage Protection
Very large reverse current in inductors can cause negative
output voltage, which is harmful to the chipset and other
output components. The NCP5380/A provides a reverse
voltage protection (RVP) function without additional
system cost. The output voltage is monitored through the
CSREF pin. When the CSREF pin voltage drops to less than
? 190 mV, the NCP5380/A triggers the RVP function by
setting both DRVH and DRVL low, thus turning off all
MOSFETs. The reverse inductor currents can be quickly
reset to 0 by discharging the built ? up energy in the inductor
into the input dc voltage source via the forward ? biased body
diode of the high ? side MOSFETs. The RVP function is
terminated when the CSREF pin voltage returns to greater
than ? 150 mV.
Sometimes the crowbar feature inadvertently results in
negative voltage because turning on the low ? side MOSFETs
results in a very large reverse inductor current. To prevent
damage to the chipset caused from negative voltage, the
NCP5380/A maintains its RVP monitoring function even
after OVP latchoff. During OVP latchoff, if the CSREF pin
voltage drops to less than ? 19 0 mV, the low ? side MOSFETs
is turned off by setting DRVL low. DRVL will be set high
again when the CSREF voltage recovers to greater than
+50 mV.
Figure 22 shows the reverse voltage protection function of
voltage is less than the V CCUVLO threshold or the EN pin is
logic low, the NCP5380/A shuts off. In shutdown mode, the
controller holds DRVH and DRVL low, shorts the capacitors
of the SS and PGDELAY pins to ground, and drives
PWRGD to low.
The user must adhere to proper power ? supply sequencing
during startup and shutdown of the NCP5380/A. All input
pins must be at ground prior to removing or applying V CC ,
and all output pins should be left in high impedance state
while V CC is off.
Output Current Monitor
The NCP5380/A includes an output current monitor
function. The IMON pin outputs an accurate current that is
directly proportional to the output current. This current is
then run through a parallel RC connected from the IMON
pin to the FBRTN pin to generate an accurately scaled and
filtered voltage. The maximum voltage on IMON is
internally clamoed by the NCP5380/A at 1.15 V.
Output Voltage No-load Offset Adjustment
The NCP5380/A output voltage can be offset from the
nominal VID settings by adjusting one resistor value. The
following figure shows the components used for setting the
no-load output offset voltage.
V CC (pin 24)
the NCP5380/A. The CSREF pin is disconnected from the
output voltage and pulled negative. As the CSREF pin drops
to less than ? 19 0 mV, the low ? side and high ? side FETs turn
off.
0.1 m F
Rofs
20
FBRTN (pin 4)
3
2
4
1
DRVL
CSREF
PWRGD
DRVH
? Vout Return
Figure 23. Setting the Output Offset Voltage
The nominal VID table for the NCP5380/A is based on the
voltage at FBRTN being 112.5 mV (R ofs nominal of
866 ohms). If it is desired to adjust the no-load output
voltage to be above or below VID, then the value of R ofs can
be changed. If we define the no-load offset from VID as
V nlofs , then the following can be used to determine the value
for R ofs (given V CC = 5 V);
Figure 22. NCP5380 RVP Function
Output Enable and UVLO
R ofs +
5
0.1125 ) V nlofs
* 1
20
For the NCP5380/A to begin switching, the V CC supply
voltage to the controller must be greater than the V CCOK
threshold and the EN pin must be driven high. If the V CC
NOTE: The 20 ohm resistor and 0.1 m F capacitor nominal
values are fixed based on the design of the NCP5380/A so
only R ofs should be adjusted for changing the no ? load offset.
http://onsemi.com
16
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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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