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PTH12040WAZ Datasheet(PDF) 11 Page - Texas Instruments |
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PTH12040WAZ Datasheet(HTML) 11 Page - Texas Instruments |
11 / 27 page www.ti.com Adjusting the Output Voltage of the PTH12040W Wide-Output Adjust Power Module Rset + 10 kW 0.8 V VO * 0.8 V * 1.696 kW (1) PTH12040W 12 15 9 1 3 5 10 13 16 11 14 +Sense -Sense -Sense GND GND 17 +Sense GND R 1% 0.05 W SET V O V O C 330 F O m C 330 F O m V Adj O PTH12040W SLTS237A–DECEMBER 2004–REVISED OCTOBER 2005 APPLICATION INFORMATION (continued) The VO Adjust control (pin 17) sets the output voltage of the PTH12040W product. The adjustment range is from 0.8 V to 5.5 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VO Adjust and GND pins 1. Table 2 gives the preferred value of the external resistor for a number of standard voltages, along with the actual output voltage that this resistance value provides. Figure 7 shows the placement of the required resistor. For other output voltages, the value of the required resistor can either be calculated, or simply selected from the range of values given in Table 3. The following formula can be used to calculate the adjust resistor value. Table 2. Standard Values of RSET for Common Output Voltages PTH12040W VO (Required) RSET VO (Actual) 5V 2.5 Ω 5.008 V 3.3 V 1.5 kΩ 3.303 V 2.5 V 3.01 kΩ 2.5 V 2 V 4.99 kΩ 1.997 V 1.8 V 6.34 kΩ 1.796 V 1.5 V 9.76 kΩ 1.498 V 1.2 V 18.2 kΩ 1.202 V 1 V 38.3 kΩ 1V 0.8 V Open 0.8 V (1) A 0.05-W rated resistor may be used. The tolerance should be 1%, and the temperature stability, 100 ppm/°C(or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pin 17 and nearest GND pin (pin 16) using dedicated PCB traces. (2) Never connect capacitors from Vo Adjust to either GND or VO. Any capacitance added to the Vo Adjust pin affects the stability of the regulator. Figure 7. Vo Adjust Resistor Placement 11 |
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