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LMR16006YQ3DDCTQ1 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza LMR16006YQ3DDCTQ1
Descripción Electrónicos  SIMPLE SWITCHER Buck Regulators With High-Efficiency ECO Mode
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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LMR16006Y-Q1
www.ti.com
SNVSAC1 – JUNE 2015
9.2.2.1 Output Inductor Selection
The most critical parameters for the inductor are the inductance, peak current and the DC resistance. The
inductance is related to the peak-to-peak inductor ripple current, the input and the output voltages. Since the
ripple current increases with the input voltage, the maximum input voltage is always used to determine the
inductance. To calculate the minimum value of the output inductor, use Equation 1. KIND is a coefficient that
represents the amount of inductor ripple current relative to the maximum output current. A reasonable value is
setting the ripple current to be 30%-40% of the DC output current. For this design example, the minimum
inductor value is calculated to be 6.82 µH, and a nearest standard value was chosen: 6.8 µH. For the output filter
inductor, it is important that the RMS current and saturation current ratings not be exceeded. The RMS and peak
inductor current can be found from Equation 3 and Equation 4. The inductor ripple current is 0.074 A, and the
RMS current is 0.60 A. As the equation set demonstrates, lower ripple currents will reduce the output voltage
ripple of the regulator but will require a larger value of inductance. A good starting point for most applications is
6.8
μH with a 1.6 A current rating. Using a rating near 1.6 A will enable the LMR16006Y-Q1 to current limit
without saturating the inductor. This is preferable to the LMR16006Y-Q1 going into thermal shutdown mode and
the possibility of damaging the inductor if the output is shorted to ground or other long-term overload.
(1)
(2)
(3)
(4)
9.2.2.2 Output Capacitor Selection
The selection of Cout is mainly driven by three primary considerations. The output capacitor will determine the
modulator pole, the output voltage ripple, and how the regulator responds to a large change in load current. The
output capacitance needs to be selected based on the most stringent of these three criteria.
The desired response to a large change in the load current is the first criteria. The regulator usually needs two or
more clock cycles for the control loop to see the change in load current and output voltage and adjust the duty
cycle to react to the change. The output capacitance must be large enough to supply the difference in current for
2 clock cycles while only allowing a tolerable amount of droop in the output voltage. Equation 5 shows the
minimum output capacitance necessary to accomplish this. The transient load response is specified as a 3%
change in VOUT for a load step from 0.03 A to 0.6 A (full load), ΔIOUT = 0.6 – 0.03 = 0.57 A and ΔVOUT = 0.03 × 5
= 0.15 V. Using these numbers gives a minimum capacitance of 3.62 µF. For ceramic capacitors, the ESR is
usually small enough to ignore in this calculation. Aluminum electrolytic and tantalum capacitors have higher
ESR that should be taken into account.
The stored energy in the inductor will produce an output voltage overshoot when the load current rapidly
decreases. The output capacitor must also be sized to absorb energy stored in the inductor when transitioning
from a high load current to a lower load current. Equation 6 is used to calculate the minimum capacitance to
keep the output voltage overshoot to a desired value. Where L is the value of the inductor, IOH is the output
current under heavy load, IOL is the output under light load, Vf is the final peak output voltage, and Vi is the initial
capacitor voltage. For this example, the worst case load step will be from 0.6 A to 0.03 A. The output voltage will
increase during this load transition and the stated maximum in our specification is 3% of the output voltage. This
will make Vo_overshoot = 1.03 × 5 = 5.15 V. Vi is the initial capacitor voltage which is the nominal output voltage
of 5 V. Using these numbers in Equation 6 yields a minimum capacitance of 1.6 µF.
Equation 7 calculates the minimum output capacitance needed to meet the output voltage ripple specification.
Where ƒsw is the switching frequency, Vo_ripple is the maximum allowable output voltage ripple, and IL_ripple is the
inductor ripple current. Equation 7 yields 95 nF.
Equation 8 calculates the maximum ESR an output capacitor can have to meet the output voltage ripple
specification. Equation 8 indicates the ESR should be less than 623 m
Ω.
Copyright © 2015, Texas Instruments Incorporated
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