参数资料
| 型号： | NCP5385MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 30/34页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 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： | 6 |
| 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) |
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页第29页当前第30页第31页第32页第33页第34页
NCP5385
Inductor Current Sense Compensation
The NCP5385 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 W
at room temp. The actual value used for Rsense was 953 W
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
30
相关PDF资料 |
PDF描述 |
|---|---|
| NCP5386BMNR2G | IC CTLR BUCK 1/2PHASE 32-QFN |
| NCP5387MNR2G | IC CTLR BUCK 2/3/4PHASE 40-QFN |
| NCP5388MNR2G | IC CTLR BUCK 2/3/4PHASE 40-QFN |
| NCP5389MNR2G | IC CTLR BUCK 2/3PHASE 32-QFN |
| NCP5391MNR2G | IC CTLR BUCK 2/3PHASE 32-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP5386 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1/2 Phase Controller for CPU and Chipset Applications |
| NCP5386A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1/2 Phase Controller for CPU and Chipset Applications |
| NCP5386AMNR2G | 功能描述:软开关 PWM 控制器 1/2 PHASE CONTROLLER RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| NCP5386B | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:1/2 Phase Controller for CPU and Chipset Applications |
| NCP5386BMNR2G | 功能描述:软开关 PWM 控制器 1/2 PHASE CONTROLLER RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。