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| 型号： | NCV8881PWR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 32/33页 |
| 文件大小： | 321K |
| 描述： | IC REG TRPL BUCK/LINEAR 16SOIC |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）（1），线性（LDO）（2） |
| 功能： | 车载 |
| 输出数： | 3 |
| 频率 - 开关： | 170kHz |
| 电压/电流 - 输出 1： | 3.3 V ~ 8 V，1.5A |
| 电压/电流 - 输出 2： | 5V，100mA |
| 电压/电流 - 输出 3： | 8.5V，40mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 5 V ~ 19 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 标准包装 |
| 其它名称： | NCV8881PWR2GOSDKR |
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NCV8881
http://onsemi.com
32
Error Amplifier
Closed Loop Gain
Compensation Network
Modulator Gain
w
dB
OUT
ESR
C
ESR
=
1
w
OUT
OUT
LC
C
L
=
1
w
2
2
1
1
C
R
Z
=
w
( )
3
3
1
2
1
C
R
R
Z
+
=
w
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
+
=
2
1
2
1
2
1
1
C
C
C
C
R
P
w
3
3
2
1
C
R
P
=
w
Figure 59.
To reiterate, there are 3 primary goals to compensating.
Goal 1 is to have a high a unity gain bandwidth (UGB) that
is greater than 1/10 the switching frequency F
SW
, but less
than 1/2 the switching frequency. UGB is also known as the
crossover frequency. This is the point where the loop gain =
0 dB or a gain of 1. In the plot above, the UGB is the point
where the red line crosses the TBD axis. Goal 2 is to have the
loop gain cross 0 dB with a 20 dB/decade slope also known
as a 1 slope. Goal 3 is to achieve over 45?of phase margin
when the gain crosses 0 dB. These are just goals. Sometimes
the crossover frequency is reduced below 1/10 F
SW
in order
to meet goal 3.
Conversely, some designs will push the crossover
frequency as high as it can (as long as it is below 1/2 F
SW
)
with a reduced phase margin of 30?in order to get a faster
transient response. The only two absolutes are that the
crossover frequency cannot exceed 1/2 F
SW
and the phase
margin has to be greater than 0?at crossover. However, a
SMPS operating towards these absolutes will experience
severe ringing before it dampens out.
To achieve the above goals, the following guidelines
should be adopted.
Place w
Z1
at half the resonance of w
LC
Place w
Z2
at or around w
LC
Place w
P1
at w
ESR
Place w
P2
at half the switching frequency
Performing these calculations will take some amount of
iteration and bench testing is needed to verify results.
ON Semiconductor has developed a tool to speed up the
design process tremendously with great ease and accuracy.
This tool can be downloaded by following the link below:
http://www.onsemi.com/pub/Collateral/COMPCALC.ZIP
ORDERING INFORMATION
Device
Package
Shipping
NCV8881PWR2G
SOIC16W EP
(PbFree)
1000 / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
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