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TPS51513RHBT Datasheet(PDF) 25 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) 25 Page - Texas Instruments

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100
–20
0
40
60
20
1 k
1 M
100 k
10 k
–180
–90
90
180
0
f
SW – Frequency – kHz
Gain
Phase
4A
4A
8A
8A
16 A
16 A
–30
0
60
90
30
–180
–90
90
180
0
100
1 k
1 M
100 k
10 k
f
SW – Frequency – kHz
Gain
Phase
4A
4A
8A
8A
16 A
16 A
TPS51513
www.ti.com
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
Because the droop amplifier is a trans-conductance amplifier, for a series RC-CC, the pole is at 0 Hz, mid-band
gain is gM × RC, and the zero frequency is RC × CC. For RC = 4.02 kΩ and CC = 1000 pF, the mid-band gain is
2.01 and the zero frequency is approximately 40 kHz. The droop amplifier gain is graphed in Figure 14 and the
overall loop gain in Figure 15.
Figure 14. Droop Amplifier Gain for Zero Load-line
Figure 15. Overall Loop Gain with Zero Load-line
Compensation
Compensation Shown for 4A, 8A, and 16A Load
Current
In this design, the bandwidth is 80 kHz and the phase margin is >90 degrees. The gain margin is low, however,
this analysis omits the affect of ceramic capacitance on the output. Ceramic capacitors reduce the loop gain at
high frequencies. Contact your TI representative to obtain a copy of the Mathcad® spreadsheet used to generate
the above curves.
Copyright © 2009–2010, Texas Instruments Incorporated
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