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TPS51513RHBT Datasheet(PDF) 24 Page - Texas Instruments

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Part No. TPS51513RHBT
Description  SINGLE PHASE, D-CAP SYNCHRONOUS BUCK CONTROLLER
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TPS51513RHBT Datasheet(HTML) 24 Page - Texas Instruments

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100
–30
–15
15
30
0
1 k
1 M
100 k
10 k
Gain
Phase
–180
–90
90
180
0
f
SW – Frequency – kHz
–30
–15
15
30
0
–180
–90
90
180
0
Gain
Phase
100
1 k
1 M
100 k
10 k
f
SW – Frequency – kHz
TPS51513
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
www.ti.com
IOUT = 5 A
FS = 350 kHz
LS = 0.56 mH
COUT = 660 mF
RESR = 3 mΩ
The theoretical waveform is plotted in Figure 12. For comparison purposes, the measured data is in Figure 13.
Note the excellent correlation between the theoretical and actual data. In both cases, the 0-dB bandwidth is
approximately 25 kHz, and the phase margin is >90 degrees! As a result, creating the desired loop response is a
matter of adding a DC gain component (if a load-line is allowed) or adding an appropriate pole-zero or
pole-zero-pole compensation
Figure 12. Theoretical Control to Output Transfer
Figure 13. Measured Control to Output Transfer
Function
Function
Limit the overall open-loop bandwidth below ½ of fS to avoid violating the Nyquist Criterion. Also, for the best
performance of the modulator, the characteristic of the compensation should be resistive at the switching
frequency. With this in mind, a zero frequency in the range of 10% to 20% of fS is recommended.
24
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Copyright © 2009–2010, Texas Instruments Incorporated
Product Folder Link(s) :TPS51513


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