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LMR23630AFDDA Datasheet(PDF) 22 Page - Texas Instruments

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Part # LMR23630AFDDA
Description  SIMPLE SWITCHER 36-V, 3-A Synchronous Step-Down Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMR23630AFDDA Datasheet(HTML) 22 Page - Texas Instruments

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LMR23630
SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017
www.ti.com
Product Folder Links: LMR23630
Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated
9.2.2.4
Inductor Selection
The most critical parameters for the inductor are the inductance, saturation current, and the rated current. The
inductance is based on the desired peak-to-peak ripple current ΔiL. Because the ripple current increases with the
input voltage, the maximum input voltage is always used to calculate the minimum inductance LMIN. Use
Equation 13 to calculate the minimum value of the output inductor. KIND is a coefficient that represents the
amount of inductor ripple current relative to the maximum output current of the device. A reasonable value of
KIND should be 20% to 40%. During an instantaneous short or overcurrent operation event, the RMS and peak
inductor current can be high. The inductor current rating should be higher than the current limit of the device.
(12)
(13)
In general, it is preferable to choose lower inductance in switching power supplies, because it usually
corresponds to faster transient response, smaller DCR, and reduced size for more compact designs. However,
inductance that is too low can generate an inductor current ripple that is too high so that overcurrent protection at
the full load could be falsely triggered. It also generates more conduction loss and inductor core loss. Larger
inductor current ripple also implies larger output voltage ripple with same output capacitors. With peak current
mode control, TI does not recommend having an inductor current ripple that is too small. A larger peak-current
ripple improves the comparator signal-to-noise ratio.
For this design example, choose KIND = 0.4, the minimum inductor value is calculated to be 8.56 µH. Choose the
nearest standard 8.2 μH ferrite inductor with a capability of 4-A RMS current and 6-A saturation current.
9.2.2.5
Output Capacitor Selection
Choose the output capacitor(s), COUT, with care because it directly affects the steady-state output-voltage ripple,
loop stability, and the voltage over/undershoot during load-current transients.
The output ripple is essentially composed of two parts. One is caused by the inductor current ripple going
through the equivalent series resistance (ESR) of the output capacitors:
(14)
The other is caused by the inductor current ripple charging and discharging the output capacitors:
(15)
The two components in the voltage ripple are not in phase, so the actual peak-to-peak ripple is smaller than the
sum of two peaks.
Output capacitance is usually limited by transient performance specifications if the system requires tight voltage
regulation with presence of large current steps and fast slew rate. When a fast large load increase happens,
output capacitors provide the required charge before the inductor current can slew up to the appropriate level.
The control loop of the regulator usually needs four or more clock cycles to respond to the output voltage droop.
The output capacitance must be large enough to supply the current difference for four clock cycles to maintain
the output voltage within the specified range. Equation 16 shows the minimum output capacitance needed for
specified output undershoot. When a sudden large load decrease happens, the output capacitors absorb energy
stored in the inductor. which results in an output voltage overshoot. Equation 17 calculates the minimum
capacitance required to keep the voltage overshoot within a specified range.


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