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| 型号： | NCP3218MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 25/35页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 7BIT 3PHASE 48QFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 3.3 V ~ 22 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-QFN（6x6） |
| 包装： | 带卷 (TR) |
| 其它名称： | NCP3218MNR2G-ND NCP3218MNR2GOSTR |
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ADP3212, NCP3218, NCP3218G
a calculated ripple current of 9.0 A. The inductor should not
saturate at the peak current of 24.5 A, and it should be able
to handle the sum of the power dissipation caused by the
configured with resistor R PH(x) (summer) and resistors R CS
and C CS (filters). The output resistance of the regulator is set
by the following equations:
winding’s average current (20 A) plus the ac core loss. In this
example, 330 nH is used.
Another important factor in the inductor design is the
R O +
R CS
R PH(x)
R SENSE
(eq. 6)
C CS +
R CS
R SENSE
C CS +
+ 2.1 nF
R PH(x) w
220 k W + 83.8 k W
DCR, which is used for measuring the phase currents. 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 0.8 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 CPU pins decreases when the output current
increases. The specified voltage drop corresponds to the
droop resistance (R O ).
The output current is measured by summing the currents
of the resistors monitoring the voltage across each inductor
and by passing the signal through a low ? pass filter. The
summing is implemented by the CS amplifier that is
L
(eq. 7)
where R SENSE is the DCR of the output inductors.
Either R CS or R PH(x) can be chosen for added flexibility.
Due to the current drive ability of the CSCOMP pin, the R CS
resistance should be greater than 100 k W . For example,
initially select R CS to be equal to 200 k W , and then use
Equation 7 to solve for C CS :
330 nH
0.8 m W 200 k W
If C CS is not a standard capacitance, R CS can be tuned. For
example, if the optimal C CS capacitance is 1.5 nF, adjust R CS
to 280 k W . For best accuracy, C CS should be a 5% NPO
capacitor. In this example, a 220 k W is used for R CS to
achieve optimal results.
Next, solve for R PH(x) by rearranging Equation 6 as
follows:
0.8 m W
2.1 m W
The standard 1% resistor for R PH(x) is 86.6 k W .
Inductor DCR Temperature Correction
If the DCR of the inductor is used as a sense element and
copper wire is the source of the DCR, the temperature
changes associated with the inductor ’s winding must be
compensated for. Fortunately, copper has a well ? known
Temperature Coefficient (TC) of 0.39%/ ° C.
If R CS is designed to have an opposite but equal
percentage of change in resistance, it cancels the
temperature variation of the inductor ’s DCR. Due to the
nonlinear nature of NTC thermistors, series resistors R CS1
and R CS2 (see Figure 30) are needed to linearize the NTC and
produce the desired temperature coefficient tracking.
Place as close as possible
to nearest inductor
R TH
To Switch Nodes
To V OUT Sense
ADP3212
CSCOMP
19
R CS1 R CS2
R PH1 R PH2
R PH3
18
CSSUM
?
+ CSREF 17
C CS2
C CS1
Keep This Path As Short
As Possible And Well Away
From Switch Node Lines
Figure 30. Temperature ? Compensation Circuit Values
http://onsemi.com
25
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