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LMZ31704 bảng dữ liệu(PDF) 11 Page - Texas Instruments

tên linh kiện LMZ31704
Giải thích chi tiết về linh kiện  4A SIMPLE SWITCHER짰 Power Module with 2.95V-17V Input and Current Sharing in QFN Package
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Trang chủ  http://www.ti.com
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LMZ31704 bảng dữ liệu(HTML) 11 Page - Texas Instruments

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SET
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1.43
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0.6
LMZ31704
www.ti.com
SLVSBV8A – JUNE 2013 – REVISED AUGUST 2013
APPLICATION INFORMATION
Adjusting the Output Voltage
The VADJ control sets the output voltage of the LMZ31704. The output voltage adjustment range is from 0.6V 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 26) and AGND (pin 23). The SENSE+ pin (pin 27) 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 22) and AGND (pin 23). Table 3 gives the standard external RSET resistor for a
number of common bus voltages, along with the recommended RRT resistor for that output voltage.
Table 3. Standard RSET Resistor Values for Common Output Voltages
RESISTORS
OUTPUT VOLTAGE VOUT (V)
0.9
1.0
1.2
1.8
2.5
3.3
5.0
RSET (kΩ)
2.87
2.15
1.43
0.715
0.453
0.316
0.196
RRT (kΩ)
1000
1000
487
169
90.9
90.9
63.4
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 4.
(1)
Table 4. Standard RSET Resistor Values
VOUT (V)
RSET (kΩ)
RRT(kΩ)
fSW(kHz)
VOUT (V)
RSET (kΩ)
RRT(kΩ)
fSW(kHz)
0.6
open
OPEN
200
3.1
0.348
90.9
750
0.7
8.66
OPEN
200
3.2
0.332
90.9
750
0.8
4.32
OPEN
200
3.3
0.316
90.9
750
0.9
2.87
1000
250
3.4
0.309
90.9
750
1.0
2.15
1000
250
3.5
0.294
90.9
750
1.1
1.74
1000
250
3.6
0.287
90.9
750
1.2
1.43
487
300
3.7
0.280
90.9
750
1.3
1.24
487
300
3.8
0.267
90.9
750
1.4
1.07
487
300
3.9
0.261
90.9
750
1.5
0.953
487
300
4.0
0.255
90.9
750
1.6
0.866
487
300
4.1
0.243
63.4
1000
1.7
0.787
487
300
4.2
0.237
63.4
1000
1.8
0.715
169
500
4.3
0.232
63.4
1000
1.9
0.665
169
500
4.4
0.226
63.4
1000
2.0
0.619
169
500
4.5
0.221
63.4
1000
2.1
0.576
169
500
4.6
0.215
63.4
1000
2.2
0.536
169
500
4.7
0.210
63.4
1000
2.3
0.511
169
500
4.8
0.205
63.4
1000
2.4
0.475
169
500
4.9
0.200
63.4
1000
2.5
0.453
90.9
750
5.0
0.196
63.4
1000
2.6
0.432
90.9
750
5.1
0.191
63.4
1000
2.7
0.412
90.9
750
5.2
0.187
63.4
1000
2.8
0.392
90.9
750
5.3
0.182
63.4
1000
2.9
0.374
90.9
750
5.4
0.178
63.4
1000
3.0
0.357
90.9
750
5.5
0.174
63.4
1000
Copyright © 2013, Texas Instruments Incorporated
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