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LMZ31520 Datasheet(PDF) 11 Page - Texas Instruments

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Part # LMZ31520
Description  20A SIMPLE SWITCHER짰 Power Module with 3.0V-14.5V Input in QFN Package
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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LMZ31520
www.ti.com
SLVSBM9B – OCTOBER 2013 – REVISED DECEMBER 2013
APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
The VADJ control sets the output voltage of the LMZ31520. The output voltage adjustment range is from 0.6V to
3.6V. The adjustment method requires the addition of RSET, which sets the output voltage, and the connection of
SENSE+ to VOUT. The RSET resistor must be connected directly between the VADJ (pin 13) and AGND (pin 9).
The SENSE+ pin (pin 14) must be connected to VOUT either at the load for improved regulation or at VOUT of
the device.
The LMZ31520 relies on a precision trimmed 0.6 V reference for the feedback voltage regulation and operates by
regulating the valley of the voltage ripple appearing at the VADJ pin. The voltage ripple is a function of the input
voltage and the output voltage, therefore the RSET resistor will change based on the input voltage. Table 1 gives
the calculated external RSET resistor for a number of common bus voltages for PVIN of 12 V, 5 V, and 3.3 V. The
recommended switching frequency is 500 kHz which can be configured by leaving the FREQ_SEL pin open. To
adjust the frequency, see Table 2.
Table 1. RSET Resistor Values
RSET (Ω)
RSET (Ω)
VOUT (V)
PVIN = 12 V
PVIN = 5 V
PVIN = 3.3 V
VOUT (V)
PVIN = 12 V
PVIN = 5 V
PVIN = 3.3 V
0.60
open
open
open
2.15
566
563
560
0.65
18787
18681
18588
2.20
548
545
542
0.70
9024
8993
8966
2.25
532
528
525
0.75
5939
5923
5908
2.30
516
513
510
0.80
4427
4416
4406
2.35
502
498
495
0.85
3529
3521
3513
2.40
488
484
481
0.90
2934
2927
2921
2.45
475
471
468
0.95
2511
2505
2500
2.50
462
459
456
1.00
2195
2190
2185
2.55
451
447
444
1.05
1950
1945
1941
2.60
439
436
433
1.10
1754
1749
1745
2.65
429
425
422
1.15
1594
1589
1586
2.70
419
415
412
1.20
1460
1456
1453
2.75
409
405
402
1.25
1348
1344
1341
2.80
400
396
393
1.30
1251
1248
1244
2.85
391
387
384
1.35
1168
1164
1161
2.90
382
379
375
1.40
1095
1091
1088
2.95
374
370
367
1.45
1031
1027
1024
3.00
367
363
359
1.50
973
970
968
3.05
359
355
352
1.55
922
919
916
3.10
352
348
345
1.60
876
873
870
3.15
345
341
338
1.65
834
831
828
3.20
339
335
331
1.70
797
793
790
3.25
332
328
325
1.75
762
759
756
3.30
326
322
318
1.80
730
727
724
3.35
320
316
312
1.85
701
698
695
3.40
315
310
307
1.90
674
671
668
3.45
309
305
301
1.95
650
646
643
3.50
304
300
296
2.00
626
623
620
3.55
299
294
291
2.05
605
602
599
3.60
294
289
286
2.10
585
581
578
Copyright © 2013, Texas Instruments Incorporated
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