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TPS51513RHBT Datasheet(PDF) 19 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) 19 Page - Texas Instruments

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P P
I
25 A
0.2
5 A
-
=
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P P
V
dT
L
I
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P P
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INST
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1.2
41.5 A
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TPS51513
www.ti.com
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
APPLICATION INFORMATION
Design Procedure
The TPS51513 has a simple design procedure for a high-performance controller.
Initial Parameters:
Step One: Determine the load requirements. For the purposes of this exercise, the following requirements are
used:
The processor requirements provide the following key parameters:
1. VMAX = 1.050 V
2. RL-L = –3 mΩ
3. IMAX = 22 A; IOCP_MIN = 25 A
4. IDYN-MAX = 10 A
5. Sleep slew rate = 5 mV/ms (minimum)
Step Two: Determine system parameters. The input voltage range and operating frequency are of primary
interest. For example:
1. VIN-MAX = 15 V
2. VIN-MIN = 8 V
3. f = 300 kHz
For an operating frequency of 350 kHz, tie TONSEL to 3.3 V.
Step Three: Determine current sensing method. The TPS51513 supports both resistor sensing and inductor
DCR sensing. Inductor DCR sensing is chosen.
For resistor sensing, substitute the resistor value (1 m
Ω recommended for a approximately 25-A application) for
RCS in the subsequent equations and skip Step Five.
Step Four: Determine inductor value and choose inductor. Smaller values of inductor have better transient
performance but higher ripple and lower efficiency. Higher values have the opposite characteristics. It is common
practice to limit the ripple current to 20% to 40% of the maximum current per phase. In this case, we use 20%:
IP-P = 25 A × 0.2 = 5 A
At f = 350 kHz, with 15-V input and 1.05-V output:
where
V = VIN-MAX – VMAX
dT = VMAX (F × VIN-MAX).
(8)
where
L = 0.6 mH
(9)
An inductor value of 0.6 mH is chosen. The inductor must not saturate during peak loading conditions. The factor
of 1.2 is to allow for current sensing and current limiting tolerances.
(10)
Copyright © 2009–2010, Texas Instruments Incorporated
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