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LMZ31506HRUQT Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce LMZ31506HRUQT
Description  6A SIMPLE SWITCHER Power Module with 4.5V-14.5V Input in QFN Package
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LMZ31506HRUQT Fiches technique(HTML) 11 Page - Texas Instruments

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SET
OUT
1.43
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k
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1
0.8
LMZ31506H
www.ti.com
SNVS996 – JULY 2013
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
The VADJ control sets the output voltage of the LMZ31506H. The output voltage adjustment range is from 1.2V
to 5.5V. The adjustment method requires the addition of RSET, which sets the output voltage, the connection of
SENSE+ to VOUT, and in some cases RRT which sets the switching frequency. The RSET resistor must be
connected directly between the VADJ (pin 43) and AGND (pin 45). The SENSE+ pin (pin 44) must be connected
to VOUT either at the load for improved regulation or at VOUT of the device. The RRT resistor must be connected
directly between the RT/CLK (pin 35) and AGND (pin 34).
Table 1 gives the standard external RSET resistor for a number of common bus voltages, along with the required
RRT resistor for that output voltage.
Table 1. Standard RSET Resistor Values for Common Output Voltages
RESISTORS
OUTPUT VOLTAGE VOUT (V)
1.2
1.5
1.8
2.5
3.3
5.0
RSET (kΩ)
2.87
1.62
1.13
0.665
0.453
0.267
RRT (kΩ)
open
open
open
1000
332
165
For other output voltages, the value of the required resistor can either be calculated using the following formula,
or simply selected from the range of values given in Table 2.
(1)
Table 2. Standard RSET Resistor Values
VOUT (V)
RSET (kΩ)
RRT(kΩ)
fSW(kHz)
VOUT (V)
RSET (kΩ)
RRT(kΩ)
fSW(kHz)
1.2
2.87
open
480
3.4
0.442
332
630
1.3
2.26
open
480
3.5
0.422
332
630
1.4
1.91
open
480
3.6
0.402
332
630
1.5
1.62
open
480
3.7
0.392
332
630
1.6
1.43
open
480
3.8
0.374
249
680
1.7
1.27
open
480
3.9
0.365
249
680
1.8
1.13
open
480
4.0
0.357
249
680
1.9
1.02
open
480
4.1
0.348
249
680
2.0
0.953
open
480
4.2
0.332
196
730
2.1
0.866
open
480
4.3
0.324
196
730
2.2
0.806
open
480
4.4
0.316
196
730
2.3
0.750
open
480
4.5
0.309
196
730
2.4
0.715
open
480
4.6
0.301
196
730
2.5
0.665
1000
530
4.7
0.294
196
730
2.6
0.634
1000
530
4.8
0.287
165
780
2.7
0.604
1000
530
4.9
0.280
165
780
2.8
0.562
1000
530
5.0
0.267
165
780
2.9
0.536
1000
530
5.1
0.267
165
780
3.0
0.511
499
580
5.2
0.261
165
780
3.1
0.499
499
580
5.3
0.255
165
780
3.2
0.475
499
580
5.4
0.249
165
780
3.3
0.453
332
630
5.5
0.243
165
780
Copyright © 2013, Texas Instruments Incorporated
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