参数资料
型号: NCP5387MNR2G
厂商: ON Semiconductor
文件页数: 33/37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 28/Feb/2008
标准包装: 2,500
应用: 控制器,Intel VR10、VR11、AMD CPU
输入电压: 4.75 V ~ 5.25 V
输出数: 4
工作温度: 0°C ~ 85°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(6x6)
包装: 带卷 (TR)
NCP5387
Inductor Current Sense Compensation
The NCP5387 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 0.1 m F capacitor for C and then solve for R.
Rsense(T) +
L
0.1 · m F · DCR25C · (1 ) 0.00393 · (T?25))
(eq. 8)
was 4.42 k W which matches the equation for Rsense at
approximately 50C. Because the inductor value is a
function of load and 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.
Simple Average PSPICE Model
A simple state average model shown in Figure 37 can be
used to determine a stable solution and provide insight into
Figure 36.
The demo board inductor measured 350 nH and
0.75 m W at room temp. The actual value used for Rsense
E1
+
+
? ?
E
0 GAIN = 6
the control system.
+
?
+
?
VRamp_min
1.3 V
?
+
Vin
12
0
12
0
1
L
2
(250e?9/4)
Voff
DCR
(0.85e?3/4)
LBRD
1 2
100 p
CBulk
(560e?6*10)
ESRBulk
(7e?3/10)
2
RBRD
0.75 m
CCer
(22e?6*18)
ESRCer
(1.5e?3/18)
2
1Aac
0Adc
+
?
I1 = 10
I2 = 110
TD = 10u
TR = 50n
TF = 50n
PW = 40u
I2
+
?
4
RDRP
ESLBulk
(3.5e?9/10)
1
ESLCer
(1.5e?9/18)
1
PER = 80u
5.11 k
CH
0
22 p
RF
CF
4.3 k
1.5 n
CFB1
680 p
RFB1
100
1E3
Unity
Gain
BW = 15 MHz R6
C3 1k
? +
Voff
RFB
1k
1.3
+
Voffset
+
+
?
VDAC
Vout
10.6 n
?
?
1.25 V
0
Figure 37.
http://onsemi.com
33
0
0
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