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LMR14003XDDCR データシート(PDF) 10 Page - Texas Instruments

部品番号 LMR14003XDDCR
部品情報  SIMPLE SWITCHER 40V 300/600mA Buck Regulators with High Efficiency Sleep Mode
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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LMR14003XDDCR データシート(HTML) 10 Page - Texas Instruments

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LMR14003, LMR14006
SNVSA10 – NOVEMBER 2013
www.ti.com
APPLICATION INFORMATION
Design Guide – Step By Step Design Procedure
This example details the design of a high frequency switching regulator using ceramic output capacitors. A few
parameters must be known in order to start the design process. These parameters are typically determined at the
system level:
Input Voltage, VIN
9V to 16V, Typical 12V
Output Voltage, VOUT
5.0V ± 3%
Maximum Output Current IO_max
0.6A
Minimum Output Current IO_min
0.03A
Transient Response 0.03A to 0.6A
5%
Output Voltage Ripple
1%
Switching Frequency Fsw
2.1MHz
Target during Load Transient
Over Voltage Peak Value
106% of Output Voltage
Under Voltage Value
91% of Output Voltage
Selecting the Switching Frequency
The first step is to decide on a switching frequency for the regulator. Typically, the user will want to choose the
highest switching frequency possible since this will produce the smallest solution size. The high switching
frequency allows for lower valued inductors and smaller output capacitors compared to a power supply that
switches at a lower frequency. The switching frequency that can be selected is limited by the minimum on-time of
the internal power switch, the input voltage and the output voltage and the frequency shift limitation. For this
example, the output voltage is 5V and the maximum input voltage is 16V, a switching frequency of 2100kHz is
used.
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% of the DC output current. For this design example, the minimum inductor
value is calculated to be 9.1 µH, and a nearest standard value was chosen: 10 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 0.16A, and the RMS current
is 0.602A. 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 a 10
μH with
2A current rating. Using a rating near 2A will enable the LMR14003/6 to current limit without saturating the
inductor. This is preferable to the LMR14003/6 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)
10
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Copyright © 2013, Texas Instruments Incorporated
Product Folder Links: LMR14003 LMR14006


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