参数资料
| 型号： | NCP5380AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/28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
APPLICATION INFORMATION
R R +
R R +
V R +
V R + + 0.89 V
R T + * 16 k W
V RT +
1 *
f C x
O
The design parameters for a typical VR11 ? compliant CPU
core VR application are as follows:
? Maximum Input Voltage (V INMAX ) = 19 V
? Minimum Input Voltage (V INMIN ) = 8.0 V
? Output Voltage by VID Setting (V VID ) = 1.2375 V
? Maximum Output Current (I O ) = 14 A
? Droop Resistance (R O ) = 6.9 m W
? Nominal Output Voltage at 15 A Load
(V OFL ) = 1.1409 V
? Static output voltage drop from no load to full load
( D V) = V ONL ? V OFL = 1.2375 V ? 1.1409 V =
96.6 mV
? Maximum Output Current Step ( D I O ) = 11 A
? Number of Phases (n) = 1
? Switching Frequency (f SW ) = 390 kHz
? Duty Cycle at Maximum Input Voltage (D MAX ) =
0.15 V
? Duty Cycle at Minimum Input Voltage (D MIN ) = 0.065
SETTING THE CLOCK FREQUENCY FOR PWM
The NCP5380/A operates in fixed frequency PWM mode
during startup, for 100 m s after a VID change, and in current
limit. In PWM operation, the NCP5380/A uses a
fixed ? frequency control architecture. The frequency is set
by an external timing resistor (RT). The clock frequency
determines the switching frequency, which relates directly
to the switching losses and the sizes of the inductors and
input and output capacitors. For example, a clock frequency
of 300 kHz sets the switching frequency to 300 kHz. This
selection represents the trade ? off between the switching
losses and the minimum sizes of the output filter
components. To achieve a 300 kHz oscillator frequency at a
VID voltage of 1.2 V, RT must be 391 k W . Alternatively, the
value for RT can be calculated by using the following
equation:
V VID ) 1.0 V
(eq. 1)
2 f sw 9 pF
Where:
9 pF and 16 k W are internal IC component values.
V VID is the VID voltage in volts.
f SW is the switching frequency in hertz.
For good initial accuracy and frequency stability, it is
recommended to use a 1% resistor.
RAMP RESISTOR SELECTION
The ramp resistor (R R ) is used for setting the size of the
internal PWM ramp. The value of this resistor is chosen to
provide the best combination of thermal balance, stability,
and transient response. Use this equation to determine a
starting value:
A R L
(eq. 2)
3 A D R DS C R
0.5 360 nH
3 5 5.2 m W 5 pF
Where:
A R is the internal ramp amplifier gain.
A D is the current balancing amplifier gain.
R DS is the total low ? side MOSFET ON ? resistance,
C R is the internal ramp capacitor value.
Another consideration in the selection of RR is the size of
the internal ramp voltage (see Equation 3). For stability and
noise immunity, keep this ramp size larger than 0.5 V. Taking
this into consideration, the value of RR is selected as 280 k W .
The internal ramp voltage magnitude can be calculated
using:
A R (1 * D ) V VID
(eq. 3)
R R C R f sw
0.5 (1 * 0.065) 1.2375 V
462 k W 5 pF 280 kHz
The size of the internal ramp can be made larger or
smaller. If it is made larger, then stability and transient
response improves, but thermal balance degrades. Likewise,
if the ramp is made smaller, then thermal balance improves
at the sacrifice of transient response and stability. The factor
of three in the denominator of Equation 2 sets a minimum
ramp size that gives an optimal balance for good stability,
transient response, and thermal balance.
COMP PIN RAMP
In addition to the internal ramp, there is a ramp signal on
the COMP pin due to the droop voltage and output voltage
ramps. This ramp amplitude adds to the internal ramp to
produce the following overall ramp signal at the PWM
input:
V R
(eq. 4)
2 (1 * D)
R
Where C X is the total bulk capacitance, and R O is the droop
resistance of the regulator.
For this example, the overall ramp signal is 0.23 V.
SETTING THE SWITCHING FREQUENCY FOR RPM
OPERATION
During the RPM operation, the NCP5380/A runs in
pseudoconstant frequency if the load current is high enough
for continuous current mode. While in DCM, the switching
frequency is reduced with the load current in a linear
manner. To save power with light loads, lower switching
http://onsemi.com
19
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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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