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PTH05050WAD Datasheet(PDF) 6 Page - Texas Instruments |
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PTH05050WAD Datasheet(HTML) 6 Page - Texas Instruments |
6 / 22 page www.ti.com APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE Rset + 10 kW 0.8 V Vout * 0.8 V *2.49 kW (1) VIN CIN 100 µF (Required) COUT 100 µF (Optional) GND VOUT RSET 1 % 0.1 W PTH05050W 1 6 3 4 2 Track V IN VO GND Inhibit 5 PTH05050W SLTS213D – MAY 2003 – REVISED JUNE 2007 The Vo Adjust control (pin 5) sets the output voltage to value higher than 0.8 V. The adjustment range of the PTH05050W is from 0.8 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 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 5 shows the placement of the required resistor. Table 1. Values of RSET for Standard Output Voltages VO (Standard) (V) RSET (Standard Value) (kΩ) VO (Actual) (V) 3.3 0.698 3.309 2.5 2.21 2.502 2 4.12 2.010 1.8 5.49 1.803 1.5 8.87 1.504 1.2 17.4 1.202 1 36.5 1.005 0.8 Open 0.8 Figure 5. VO Adjust Resistor Placement NOTES: 1. A 0.05-W resistor may be used. The tolerance should be 1%, with temperature stability of 100 ppm/ °C (or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 5 and 1 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. 6 Submit Documentation Feedback |
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