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NCV8855
control loop has a gain crossing with ? 20 dB/decade slope
and a phase margin greater than 45 ° .
gain = 0 dB or a gain of 1. In the plot above, the UGB is the
point where the red line crosses the W axis. Goal 2 is to have
the closed loop gain cross 0 dB with a ? 20 dB/decade slope
dB
w Z1 +
1
R 2 @ C 2
w Z2 +
1
R 1 ) R 3 @ C 3
1
w P1 +
C 1 @ C 2
C 1 ) C 2
w P2 +
1
R 3 @ C 3
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 FSW 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 FSW) with a
reduce 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 FSW and the phase margin has
w
to be greater than 0 ° at crossover. However, a SMPS
operating towards these absolutes will experience sever
ringing before it dampens out.
1
w LC +
L OUT @ C OUT
1
w ESR +
ESR @ C OUT
Error Amplifier
Compensation Network
Modulator Gain
Closed Loop Gain
To achieve the above goals, the following guidelines
should be adopted.
? Place wZ1 at half the resonance of wLC
? Place wZ2 at or around wLC
? Place wP1 at wESR
Figure 27.
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, but less than 1/2
the switching frequency. UGB is also known as the
crossover frequency. This is the point where the closed loop
? Place wP2 at half the switching frequency
Performing these calculations will take some amount of
iterations and bench testing to verify results. However,
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 below link.
http://www.onsemi.com/pub/Collateral/COMPCALC.ZIP
http://onsemi.com
21
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相关PDF资料
NCV8871BSTGEVB BOARD EVAL NCV8871BST BOOST CTLR
NHC-14150 VALULINE 8" X 8.5" X 1.75"
NHC-14151 VALULINE 8" X 17" X 1.75"
NHC-14152 VALULINE 13" X 17" X 1.75"
NHC-14153 VALULINE 8" X 8.5" X 3.5"
NHC-14154 VALULINE 8" X 17" X 3.5"
NHC-14155 VALULINE 13" X 17" X 3.5"
NHC-14156 VALULINE 13" X 17" X 5.25"
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