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TPS61300YFFR Datasheet(PDF) 51 Page - Texas Instruments

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No. de Pieza. TPS61300YFFR
Descripción  TPS6130xx 1.5-A and 4.1-A Multiple LED Camera Flash Driver With I2C Compatible Interface
Descarga  70 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS61300YFFR Datasheet(HTML) 51 Page - Texas Instruments

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OUT
OUT
IN
min
OUT
I
× (V
V )
C
f
V
V
-
»
´ D
´
OUT
OUT
IN
IN
L(PEAK)
OUT
I
V
V
V
D
I
=
+
with D =
2
f
L
(1 D )
V
-
´
´
´
-
´ h
OUT
L
OUT
IN
V
I
I
η
V
»
´
´
51
TPS61300, TPS61301
TPS61305, TPS61305A, TPS61306
www.ti.com
SLVS957E – JUNE 2009 – REVISED APRIL 2016
Product Folder Links: TPS61300 TPS61301 TPS61305
Submit Documentation Feedback
Copyright © 2009–2016, Texas Instruments Incorporated
9.2.1.2 Detailed Design Procedure
9.2.1.2.1
Inductor Selection
A boost converter requires two main passive components for storing energy during the conversion. A boost
inductor and a storage capacitor at the output are required. The TPS6130xx device integrates a current limit
protection circuitry. The valley current of the PMOS rectifier is sensed to limit the maximum current flowing
through the synchronous rectifier and the inductor. The valley peak current limit (250 mA, 500 mA, 1250 mA, or
1750 mA) is user selectable through the I2C interface.
To optimize solution size, the TPS6130xx device has been designed to operate with inductance values between
a minimum of 1.3
μH and maximum of 2.9 μH. TI recommends a 2.2-μH inductance in typical high current white
LED applications.
The highest peak current through the inductor and the power switch depends on the output load, the input and
output voltages. Estimation of the maximum average inductor current and the maximum inductor peak current
can be done using Equation 2 and Equation 3:
(2)
where
f = switching frequency (2 MHz)
L = inductance value (2.2
μH)
η = estimated efficiency (85%)
(3)
The losses in the inductor caused by magnetic hysteresis losses and copper losses are a major parameter for
total circuit efficiency.
9.2.1.2.2
Input Capacitor
TI recommends low ESR ceramic capacitors for good input voltage filtering. TI recommends a 10-
μF input
capacitor to improve transient behavior of the regulator and EMI behavior of the total power supply circuit. The
input capacitor must be placed as close as possible to the input pin of the converter.
9.2.1.2.3
Output Capacitor
The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of
the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is
possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by
using Equation 4:
where
f is the switching frequency and
ΔV is the maximum allowed ripple
(4)
With a chosen ripple voltage of 10 mV, a minimum capacitance of 10
μF is needed. The total ripple is larger due
to the ESR of the output capacitor. This additional component of the ripple can be calculated using Equation 5:
ΔVESR = IOUT × RESR
(5)
The total ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the
capacitor. Additional ripple is caused by load transients. This means that the output capacitor has to completely
supply the load during the charging phase of the inductor. A reasonable value of the output capacitance depends
on the speed of the load transients and the load current during the load change.
For the standard current white LED application (HC_SEL = 0, TPS6130xx), a minimum of 3-
μF effective output
capacitance is usually required when operating with 2.2-
μH (typical) inductors. For solution size reasons, this is
usually one or more X5R or X7R ceramic capacitors.


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