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PTH04T261WAZT Datasheet(PDF) 11 Page - Texas Instruments |
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PTH04T261WAZT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 36 page APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE R SET + 10 kW 0.69 V O * 0.69 * 1.43 kW (1) UDG−06043 RSET 1% 0.05 W VO +Sense −Sense VoAdj GND 3 4 5 6 7 +Sense −Sense GND VO PTH04T260/261W PTH04T260W, PTH04T261W www.ti.com.................................................................................................................................................. SLTS273E – SEPTEMBER 2006 – REVISED JULY 2009 The VO Adjust control (pin 7) sets the output voltage of the PTH04T260/261W. The adjustment range of the PTH04T260/261W is 0.69V to 3.6V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VO Adjust and the –Sense pins. Table 1 gives the standard value of the external resistor for a number of standard voltages, along with the actual output voltage that this resistance value provides. 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. Figure 9 shows the placement of the required resistor. Table 1. Preferred Values of RSET for Standard Output Voltages VO (Standard) (V) RSET (Standard Value) (kΩ) VO (Actual) (V) 3.3 (1) 1.21 3.304 2.5 (1) 2.37 2.506 1.8 (1) 4.75 1.807 1.5 (1) 6.98 1.510 1.2 12.1 1.200 1.0 20.5 1.004 0.7 681 0.700 (1) The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater. (1) RSET: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/°C (or better). Connect the resistor directly between pins 7 and 6, as close to the regulator as possible, using dedicated PCB traces. (2) Never connect capacitors from VO Adjust to either GND, VO, or +Sense. Any capacitance added to the VO Adjust pin affects the stability of the regulator. Figure 9. VO Adjust Resistor Placement Copyright © 2006–2009, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): PTH04T260W PTH04T261W |
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