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PTN78060AAZ Datasheet(PDF) 8 Page - Texas Instruments |
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PTN78060AAZ Datasheet(HTML) 8 Page - Texas Instruments |
8 / 18 page www.ti.com APPLICATION INFORMATION Adjusting the Output Voltage of the PTN78060A Wide-Output Adjust Power Modules General R = 54.9 k SET W ´ 1.25 V | | V - 3 V O - 5.62 kW (1) Input Voltage Considerations GND GND PTN78060A 6 1, 7 2 Adj GND 4 + + C2 C1 RSET 0.05 W 1% C3 V O V O V I V I PTN78060A SLTS245A – APRIL 2005 – REVISED MAY 2005 A resistor must be connected directly between the VO Adjust control (pin 4) and the output voltage (pin 7) to set the output voltage lower than –3 V. The adjustment range is from –15 V to –3 V. If pin 4 is left open, the output voltage defaults to the highest value, –3 V. Table 1 gives the standard resistor value for a number of common voltages, and with the actual output voltage that the value produces. For other output voltages, the resistor value can either be calculated using the following formula, or simply selected from the range of values given in Table 2. Figure 18 shows the placement of the required resistor. The PTN78060A is a buck-boost switching regulator. In order that the output remains in regulation, the input voltage must not exceed the output by a maximum differential voltage. Another consideration is the pulse width modulation (PWM) range of the regulator's internal control circuit. For stable operation, its operating duty cycle should not be lower than some minimum percentage. This defines the maximum advisable ratio between the regulator's input and output voltage magnitudes. For satisfactory performance, the maximum operating input voltage range must be equal to (32 – |VO|) volts. As an example, Table 1 gives the operating input voltage range for the common output bus voltages. In addition, the Electrical Characteristics define the available output voltage adjust range for various input voltages. Table 1. Standard Values of Rset for Common Output Voltages VO RSET VO Operating (Required) (Standard Value) (Actual) VI Range –15 V 100 Ω –14.997 V 9 V to 17 V –12 V 2 k Ω –12.006 V 9 V to 20 V –5 V 28.7 k Ω –5.000 V 9 V to 27 V –3.3 V 221 k Ω –3.303 V 9 V to 28.7 V (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 7 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 18. VO Adjust Resistor Placement 8 |
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