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参数资料
| 型号： | NCP3218MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 30/35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
C A +
R E
R B
C Snubber +
The compensation values can be calculated as follows:
n R O T A
(eq. 31)
1
p f Ringing R Snubber
P Snubber + C Snubber V Input 2 f Switching
(eq. 37)
(eq. 38)
T C
R A +
C A
C B +
T B
R B
C FB +
T D
R A
(eq. 32)
(eq. 33)
(eq. 34)
The standard values for these components are subject to
the tuning procedure described in the Tuning Procedure for
12 section.
C IN Selection and Input Current di/dt Reduction
In continuous inductor ? current mode, the source current
of the high ? side MOSFET is approximately a square wave
with a duty ratio equal to n × V OUT /V IN and an amplitude
that is one ? n th of the maximum output current. To prevent
large voltage transients, use a low ESR input capacitor sized
for the maximum rms current. The maximum rms capacitor
Where R Snubber is the snubber resistor.
C Snubber is the snubber capacitor.
f Rininging is the frequency of the ringing on the switch node
when the high side MOSFET turns on.
C OSS is the low side MOSFET output capacitance at V Input .
This is taken from the low side MOSFET data sheet.
V input is the input voltage.
f Switching is the switching frequency.
P Snubber is the power dissipated in R Snubber .
Selecting Thermal Monitor Components
To monitor the temperature of a single ? point hot spot, set
R TTSET1 equal to the NTC thermistor’s resistance at the alarm
temperature. For example, if the alarm temperature for VRTT
is 100 ° C and a Vishey thermistor (NTHS ? 0603N011003J)
with a resistance of 100 k W at 25 ° C, or 6.8 k W at 100 ° C, is
used, the user can set R TTSET1 equal to 6.8 k W (the R TH1 at
100 ° C).
I CRMS + D
I O
* 1
I CRMS + 0.18
40 A
* 1 + 9.6 A
current occurs at the lowest input voltage and is given by:
1
n D (eq. 35)
1
2 0.18
where I O is the output current.
In a typical notebook system, the battery rail decoupling
is achieved by using MLC capacitors or a mixture of MLC
ADP3212
R
R
VRTT
VCC
TTSNS
C TT
5V
R TTSET1
R TH1
capacitors and bulk capacitors. In this example, the input
V FD
V REF
V FD
V REF
capacitor bank is formed by eight pieces of 10 m F, 25 V MLC
capacitors, with a ripple current rating of about 1.5 A each.
RC Snubber
It is important in any buck topology to use a
resistor ? capacitor snubber across the low side power
MOSFET. The RC snubber dampens ringing on the switch
node when the high side MOSFET turns on. The switch node
ringing could cause EMI system failures and increased
stress on the power components and controller. The RC
snubber should be placed as close as possible to the low side
MOSFET. Typical values for the resistor range from 1 W to
10 W . Typical values for the capacitor range from 330 pF to
4.7 nF. The exact value of the RC snubber depends on the
PCB layout and MOSFET selection. Some fine tuning must
be done to find the best values. The equation below is used
to find the starting values for the RC subber.
Figure 33. Single ? Point Thermal Monitoring
To monitor the temperature of multiple ? point hot spots,
use the configuration shown in Figure 34. If any of the
monitored hot spots reaches the alarm temperature, the
VRTT signal is asserted. The following calculation sets the
alarm temperature:
1 2 ) (eq. 39)
R TTSET1 + R TH1AlarmTemperature
1 2 *
where V FD is the forward drop voltage of the parallel diode.
Because the forward current is very small, the forward
drop voltage is very low, that is, less than 100 mV. Assuming
the same conditions used for the single ? point thermal
monitoring example—that is, an alarm temperature of
R Snubber +
2
p
1
f Ringing
C OSS
(eq. 36)
100 ° C and use of an NTHS ? 0603N011003J Vishay
thermistor—solving Equation 39 gives a R TTSET of 7.37 k W ,
and the closest standard resistor is 7.32 k W (1%).
http://onsemi.com
30
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