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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TPS84A20 Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS84A20 Fiches technique(HTML) 11 Page - Texas Instruments |
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11 / 30 page  ( ) = W æ ö æ ö - ç ÷ ç ÷ è ø è ø SET OUT 1.43 R k V 1 0.6 TPS84A20 www.ti.com SLVSBC6 – MARCH 2013 APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE The VADJ control sets the output voltage of the TPS84A20. 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 1 gives the standard external RSET resistor for a number of common bus voltages, along with the recommended RRT resistor for that output voltage. Table 1. 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 2. (1) Table 2. 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 Submit Documentation Feedback 11 Product Folder Links: TPS84A20 |
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