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LMZ31506HRUQT Fiches technique(PDF) 11 Page - Texas Instruments |
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LMZ31506HRUQT Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 30 page ( ) = W æ ö æ ö - ç ÷ ç ÷ è ø è ø SET OUT 1.43 R k V 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 Submit Documentation Feedback 11 Product Folder Links: LMZ31506H |
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