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TPS51513RHBT Datasheet(PDF) 22 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) 22 Page - Texas Instruments

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CS(eff )
CS
DROOP
M
L L
R
A
R
G
R
-
´
=
´
SLEW
SLEW
SLEW
K
V
R
SR
´
=
IMON
IMON
IMON
CS
V
R
K
V
=
´
( )
CS
MAX
CS eff
V
R
I
=
´
CS
CSINT
IMON
IMON2
IMON
8
V
A
R
R
V
´
´
´
=
TPS51513
SLUS956A – JUNE 2009 – REVISED FEBRUARY 2010
www.ti.com
Step Seven: Set the load line. The load line is set by the droop resistor knowing RL-L and RCS_Eff.
(15)
RDROOP = 5.23 kΩ.
Step Eight: Select the DROOP capacitor.
The DROOP capacitor is used to provide high-frequency filtering of the voltage loop. Use values under 100 pF. A
higher value provides less jitter for steady-state operation, but slows down the transient response.
Step Nine: Calculate RSLEW. RSLEW sets both slew rates:
1. Sleep exit slew rate.
2. Soft-start and soft-stop exit rate is 1/8 of the sleep exit rate
Set the sleep rate to 6 mV/ms to allow 20% for tolerances. From Equation 3):
(16)
In this case, RSLEW is terminated to GND. KSLEW = 1.25x10
9 and V
SLEW = 0.45 V. For a slew rate (SR) of 6 mV/ms
nominal, 5 mV/mS minimum, RSLEW = 90.9 kΩ.
Step Ten: Calculate IMON resistors.
From Equation 6,
(17)
And,
where
VCS = 29.8 mV
KIMON = 2mA/mV
(18)
The IMONC pin is connected to 3.3 V; to allow for tolerances, a full scale value of 3.1 V (VIMON) is desired. Then,
RIMON = 47.5 kΩ.
In order to increase the accuracy of the current monitor overtemperature the IMON2 pin is provided to match the
temperature coefficients of two critical resistors in the circuit. Connect a resistor from IMON2 to VREF.
After determining the full-scale voltage on the IMON output (VIMON) and selecting RIMON, the value of RIMON2
resistor is from Equation 7:
where
ACSINT = 6
RIMON2 = 24.3kΩ
(19)
22
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