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LMQ61460 Datasheet(PDF) 31 Page - Texas Instruments

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No. de pieza LMQ61460
Descripción Electrónicos  LMQ61460 3-V to 36-V, 6 A, Low EMI Synchronous Step-Down Quiet Converter
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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fSW G
VIN(MAX2) Â WON_MIN(MAX)
VOUT
(7)
If foldback at low input voltage is a concern, use Equation 8:
fSW
VINeff(MIN2) Â WOFF_MIN(MAX)
VINeff(MIN2) ± VOUT
(8)
where:
VINeff(MIN2) = VIN(MIN2) ± IOUT(MAX) Â (RDS(ON)_HS(MAX) + DCR(MAX))
• DCR(MAX) = maximum DCR of the inductor
• tOFF_MIN(MAX) = see Section 6.5
• RDS(ON)_HS(MAX) = see Section 6.5
The fourth constraint is the rated frequency range of the IC. See fADJ in Section 6.5. All four constraints above,
thermal, VIN(MAX2), VIN(MIN2), and device specified frequency range must be considered when selecting
frequency.
Many applications require that the AM band can be avoided. These applications tend to operate at either 400
kHz below the AM band or 2.1 MHz above the AM band. In this example, 400 kHz is chosen.
8.2.2.2 Setting the Output Voltage
The output voltage of the device is externally adjustable using a resistor divider network. The range of
recommended output voltage is found in Section 6.3. The divider network is comprised of RFBT and RFBB, and
closes the loop between the output voltage and the converter. The converter regulates the output voltage by
holding the voltage on the FB pin equal to the internal reference voltage, VREF. The resistance of the divider is a
compromise between excessive noise pickup and excessive loading of the output. Smaller values of resistance
reduce noise sensitivity but also reduce the light-load efficiency. The recommended value for RFBT is 100 kΩ with
a maximum value of 1 MΩ. If 1 MΩ is selected for RFBT, then a feedforward capacitor must be used across this
resistor to provide adequate loop phase margin (see Section 8.2.2.10). Once RFBT is selected, Equation 3 is
used to select RFBB. VREF is nominally 1 V. For this 5-V example, RFBT = 100 kΩ and RFBB = 24.9 kΩ are
chosen.
8.2.2.3 Inductor Selection
The parameters for selecting the inductor are the inductance and saturation current. The inductance is based on
the desired peak-to-peak ripple current and is normally chosen to be in the range of 20% to 40% of the
maximum output current. Experience shows that the best value for inductor ripple current is 30% of the
maximum load current for systems with a fixed input voltage and 25% for systems with a variable input voltage
such as the 12 volt battery in a car. Note that when selecting the ripple current for applications with much smaller
maximum load than the maximum available from the device, the maximum device current must still be used.
Equation 9 can be used to determine the value of inductance. The constant K is the percentage of inductor
current ripple. For this example, K = 0.25 was chosen and an inductance of approximately 5.25 μH was found.
The next standard value of 4.7 μH was selected.
L=
fSW Â . Â ,OUT(MAX)
VIN Å 9OUT
Â
VOUT
VIN
(9)
The saturation current rating of the inductor must be at least as large as the high-side switch current limit, IL-HS
(see Section 6.5). This ensures that the inductor does not saturate even during a short circuit on the output.
When the inductor core material saturates, the inductance falls to a very low value, causing the inductor current
to rise very rapidly. Although the valley current limit, IL-LS, is designed to reduce the risk of current run-away, a
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LMQ61460
SNVSBR8A – JULY 2020 – REVISED AUGUST 2020
Copyright © 2020 Texas Instruments Incorporated
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