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PTH04T240FAD Datasheet(PDF) 9 Page - Texas Instruments |
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PTH04T240FAD Datasheet(HTML) 9 Page - Texas Instruments |
9 / 35 page APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE R SET + 10 kW 0.69 V O * 0.69 * 1.43 kW (1) +Sense V O -Sense V OAdj PTH04T240F 5 6 7 R SET 1% 0.05 W 8 +Sense -Sense GND V O UDG-08159 GND 3 4 PTH04T240F www.ti.com ............................................................................................................................................... SLTS293A – DECEMBER 2008 – REVISED MARCH 2009 The VOAdjust control (pin 8) sets the output voltage of the PTH04T240F. The adjustment range is between 0.69 V and 2.0 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VOAdjust and – 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. Standard Values of RSET for Standard Output Voltages VO (Standard) (V) RSET (Standard Value) (kΩ) VO (Actual) (V) 2.0 (1) 3.83 2.002 1.8 (1) 4.75 1.807 1.5 (1) 6.98 1.510 1.2 12.1 1.200 1 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 VOAdjust (pin 8) and -Sense (pin 7), as close to the regulator as possible, using dedicated PCB traces. (2) Never connect capacitors from VOAdjust (pin 8) to either +Sense (pin 6), GND, or VO (pin 5). Any capacitance added to the VOAdjust pin affects the stability of the regulator. Figure 9. VO Adjust Resistor Placement Copyright © 2008–2009, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): PTH04T240F |
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