参数资料
| 型号： | NCP5380AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/28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) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页第28页
NCP5380, NCP5380A
R R
C R
R RPM + * 0.5 k W
R RPM +
V VID
1 * D MIN
V RIPPLE
I R +
V VID
R O
1 * D MIN
R O + R SENSE
frequency is usually preferred during RPM operation.
However, the V CC ripple specification of VR11 sets a
limitation for the lowest switching frequency. Therefore,
depending on the inductor and output capacitors, the
switching frequency in RPM can be equal to, greater than,
or less than its counterpart in PWM.
A resistor from RPM to GND sets the pseudo constant
frequency as following:
(eq. 5)
2 R T A R (1 * D ) V VID
V VID ) 1.0 V f sw
Where:
A R is the internal ramp amplifier gain.
C R is the internal ramp capacitor value.
R R is an external resistor on the RAMPADJ pin to set the
internal ramp magnitude.
Because R R = 280 k W , the following resistance sets up
300 kHz switching frequency in RPM operation.
2 280 k W
1.2375 V ) 1.0 V
0.5 (1 * 0.065) 1.2375 V
* 500 W
462 k W 5 pF 300 kHz
+ 208 k W
INDUCTOR SELECTION
The choice of inductance determines the ripple current of
the inductor. Less inductance results in more ripple current,
which increases the output ripple voltage and the conduction
losses in the MOSFETs. However, this allows the use of
smaller ? size inductors, and for a specified peak ? to ? peak
transient deviation, it allows less total output capacitance.
Conversely, a higher inductance results in lower ripple
current and reduced conduction losses, but it requires
larger ? size inductors and more output capacitance for the
same peak ? to ? peak transient deviation. For a buck
converter, the practical value for peak ? to ? peak inductor
ripple current is less than 50% of the maximum dc current
of that inductor. Equation 6 shows the relationship between
the inductance, oscillator frequency, and peak ? to ? peak
ripple current. Equation 7 can be used to determine the
minimum inductance based on a given output ripple voltage.
(eq. 6)
f sw
(eq. 7)
L w
f sw V RIPPLE
In this example, RO is assumed to be the ESR of the output
capacitance, which results in an optimal transient response.
Solving Equation 7 for a 16 mV peak ? to ? peak output ripple
voltage yields:
If the resultant ripple voltage is less than the initially
selected value, the inductor can be changed to a smaller
value until the ripple value is met. This iteration allows
optimal transient response and minimum output decoupling.
In this example, the iteration showed that a 560 nH inductor
was sufficient to achieve a good ripple.
The smallest possible inductor should be used to minimize
the number of output capacitors. Choosing a 560 nH
inductor is a good choice for a starting point, and it provides
a calculated ripple current of 6.6 A. The inductor should not
saturate at the peak current of 18.3 A, and it should be able
to handle the sum of the power dissipation caused by the
winding’s average current (15 A) plus the ac core loss.
Another important factor in the inductor design is the
DCR, which is used for measuring the inductor current. Too
large of a DCR causes excessive power losses, whereas too
small of a value leads to increased measurement error. For
this example, an inductor with a DCR of 1.3 m W is used.
Selecting a Standard Inductor
After the inductance and DCR are known, select a
standard inductor that best meets the overall design goals. It
is also important to specify the inductance and DCR
tolerance to maintain the accuracy of the system. Using 20%
tolerance for the inductance and 15% for the DCR at room
temperature are reasonable values that most manufacturers
can meet.
Power Inductor Manufacturers
The following companies provide surface ? mount power
inductors optimized for high power applications upon
request.
? Vishay Dale Electronics, Inc.
(605) 665 ? 9301
? Panasonic
(714) 373 ? 7334
? Sumida Electric Company
(847) 545 ? 6700
? NEC Tokin Corporation
(510) 324 ? 4110
Output Droop Resistance
The design requires that the regulator output voltage
measured at the chipset pins decreases when the output
current increases. The specified voltage drop corresponds to
the droop resistance (R O ).
The output current is measured by low ? pass filtering the
voltage across the inductor or current sense resistor. The
filter is implemented by the CS amplifier that is configured
with R PH , R CS , and C CS . The output resistance of the
regulator is set by the following equations:
R CS
(eq. 9)
R PH
L w
1.2375 V 6.9 m W
390 kHz
(1 * 0.065)
16 mV
(eq. 8)
+ 1.3 m H
C CS +
L
R SENSE
R CS
(eq. 10)
http://onsemi.com
20
相关PDF资料 |
PDF描述 |
|---|---|
| NCP5381AMNR2G | IC BUCK CTLR 2/3/4PHASE 40-QFN |
| NCP5381MNR2G | IC CTLR BUCK 2/3/4PHASE 40-QFN |
| NCP5382MNR2G | IC BUCK CTLR 2-6PHASE 48-QFN |
| NCP5383MNR2G | IC REG CTRLR BUCK PWM 24-QFN |
| NCP5385MNR2G | IC CTLR BUCK 2/3/4PHASE 40-QFN |
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 |
发布紧急采购，3分钟左右您将得到回复。