参数资料
| 型号： | NCP5381AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 30/34页 |
| 文件大小： | 0K |
| 描述： | IC BUCK CTLR 2/3/4PHASE 40-QFN |
| 产品变化通告： | Specification Change MSL Updated 13/June/2008 Product Discontinuation 01/Oct/2008 |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel Pentium? IV |
| 输入电压： | 10.8 V ~ 13.2 V |
| 输出数： | 4 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（7x7） |
| 包装： | 带卷 (TR) |
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NCP5381A
Inductor Current Sense Compensation
The NCP5381A uses the inductor current sensing
method. This method uses an RC filter to cancel out the
inductance of the inductor and recover the voltage that is
the result of the current flowing through the inductor ’s
DCR. This is done by matching the RC time constant of the
current sense filter to the L/DCR time constant. The first
cut approach is to use a 0.47 m F capacitor for C and then
solve for R.
Rsense(T) =
L
0.47 · m F · DCR25C · (1 + 0.00393 · C --1 · (T--25 · C))
(eq. 8)
inductor temperature final selection of R is best done
experimentally on the bench by monitoring the Vdroop pin
and performing a step load test on the actual solution.
It is desirable to keep the Rsense resistor value below
1.0 k whenever possible by increasing the capacitor values
in the inductor compensation network. The bias current
flowing out of the current sense pins is approximately
100 nA. This current flows through the current sense
resistor and creates an offset at the capacitor which will
appear as a load current at the Vdroop pin. A 1.0 k resistor
0 GAIN = 6
Figure 18.
The demoboard inductor measured 350 nH and 0.75 m Ω
at room temp. The actual value used for Rsense was 953 Ω
which matches the equation for Rsense at approximately
50C. Because the inductor value is a function of load and
E1
+
+
-- --
E
will keep this offset at the droop pin below 2.5 mV.
Simple Average PSPICE Model
A simple state average model shown in Figure 19 can be
used to determine a stable solution and provide insight into
the control system.
+
2
--
+
--
VRamp_min
1.3 V
--
+
Vin
12
0
4
12
0
1
L
(250e--9/4)
Voff
DCR
(0.85e--3/4)
LBRD
1 2
100 p
CBulk
(560e--6*10)
ESRBulk
(7e--3/10)
2
ESLBulk
(3.5e--9/10)
RBRD
0.75 m
CCer
(22e--6*18)
ESRCer
(1.5e--3/18)
2
ESLCer
(1.5e--9/18)
1Aac
0Adc
+
--
I1 = 10
I2 = 110
TD = 10u
TR = 50n
TF = 50n
PW = 40u
PER = 80u
+
--
I2
RDRP
1
1
CH
5.11 k
0
RF
22 p
CF
4.3 k
1.5 n
CFB1
680 p
RFB1
100
--
1E3
Unity
Gain
BW = 15 MHz R6
C3 1k
10.6 n
0
-- +
Voff
RFB
1k
1.3
+
--
Voffset
0
+
--
+
VDAC
1.25 V
0
Vout
Figure 19.
http://onsemi.com
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| NCP5382 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2/3/4/5/6 Phase Buck Controller for VR10 and VR11 Pentium IV Processor Applications |
| NCP5382MNR2G | 功能描述:DC/DC 开关控制器 PHASE CONTROLLER 4 5 6 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 |
| NCP5383 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2 Phase Buck Controller with Integrated Gate Drivers and AVP |
| NCP5383_1 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:2 Phase Buck Controller with Integrated Gate Drivers and AVP |
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