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TPS84320RUQT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS84320RUQT Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 31 page  ( ) = W æ ö æ ö - ç ÷ ç ÷ è ø è ø SET OUT 1.43 R k V 1 0.8 TPS84320 www.ti.com SLUSAH7 – SEPTEMBER 2011 APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE The VADJ control sets the output voltage of the TPS84320. The output voltage adjustment range is from 0.8V 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 module. 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. For other output voltages, the value of the required resistor can either be calculated using Equation 1, or selected from the values given in Table 2. Table 1. Standard RSET Resistor Values for Common Output Voltages RESISTORS OUTPUT VOLTAGE VOUT (V) 0.8 1.0 1.2 1.5 1.8 2.5 3.3 5.0 RSET (kΩ) open 5.76 2.87 1.62 1.13 0.665 0.453 0.267 RRT (kΩ) open open 324 324 324 324 158 105 (1) Table 2. Standard RSET Resistor Values VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz) VOUT (V) RSET (kΩ) RRT(kΩ) fSW(kHz) 0.8 open open 330 3.2 0.475 191 580 0.9 11.3 open 330 3.3 0.453 158 630 1.0 5.76 open 330 3.4 0.442 158 630 1.1 3.83 open 330 3.5 0.422 158 630 1.2 2.87 324 480 3.6 0.402 158 630 1.3 2.26 324 480 3.7 0.392 158 630 1.4 1.91 324 480 3.8 0.374 137 680 1.5 1.62 324 480 3.9 0.365 137 680 1.6 1.43 324 480 4.0 0.357 137 680 1.7 1.27 324 480 4.1 0.348 137 680 1.8 1.13 324 480 4.2 0.332 118 730 1.9 1.02 324 480 4.3 0.324 118 730 2.0 0.953 324 480 4.4 0.316 118 730 2.1 0.866 324 480 4.5 0.309 118 730 2.2 0.806 324 480 4.6 0.301 118 730 2.3 0.750 324 480 4.7 0.294 118 730 2.4 0.715 324 480 4.8 0.287 105 780 2.5 0.665 324 480 4.9 0.280 105 780 2.6 0.634 237 530 5.0 0.267 105 780 2.7 0.604 237 530 5.1 0.267 105 780 2.8 0.562 237 530 5.2 0.261 105 780 2.9 0.536 237 530 5.3 0.255 105 780 3.0 0.511 191 580 5.4 0.249 105 780 3.1 0.499 191 580 5.5 0.243 105 780 Copyright © 2011, Texas Instruments Incorporated 11 |
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