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PTH04070W Datasheet(PDF) 7 Page - Texas Instruments |
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PTH04070W Datasheet(HTML) 7 Page - Texas Instruments |
7 / 16 page www.ti.com APPLICATION INFORMATION Adjusting the Output Voltage of the PTH04070W Wide-Output Adjust Power Modules Rset + 10 kW 0.891 V Vout * 0.9 V * 3.24 kW Inhibit GND GND RSET 0.05 W 1% C1 Ceramic C2 Ceramic PTH04070W 2 4 3 1 5 VO Adj GND VO VIN 47- µF 47- µF VI VO Inhibit PTH04070W SLTS227B – SEPTEMBER 2004 – REVISED OCTOBER 2007 The VOAdjust control (pin 4) sets the output voltage of the PTH04070W product. The adjustment range is from 0.9 V to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected directly between the VOAdjust and GND pin 2. Table 1 gives the standard external resistor for a number of common bus voltages, along with the actual voltage the resistance produces. 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 Common Output Voltages VO (V) RSET (kΩ) VO(V) (Required) (Standard Value) (Actual) 3.3(1) 0.475 3.298 2.5(1) 2.32 2.502 2 4.87 1.999 1.8 6.65 1.801 1.5 11.5 1.504 1.2 26.1 1.204 1 84.5 1.001 0.9 Open 0.9 (1) The minimum input voltage is 3 V or (VO + 1.1) V, whichever is greater. (1) A 0.05-W rated resistor may be used. The tolerance should be 1%, with a temperature stability of 100 ppm/ °C (or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 2 using dedicated PCB traces. (2) Never connect capacitors from VOAdjust to either GND or VO. Any capacitance added to the VOAdjust pin will affect the stability of the regulator. Figure 9. VO Adjust Resistor Placement Copyright © 2004–2007, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Link(s): PTH04070W |
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