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PT6932 Datasheet(PDF) 3 Page - Texas Instruments |
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PT6932 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 7 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com PT6920/PT6930 Series Adjusting the Output Voltage of the PT6920 and PT6930 Dual Output Voltage ISRs Each output voltage from the PT6920 and PT6930 series of ISRs can be independantly adjusted higher or lower than the factory trimmed pre-set voltage. Vo1 or Vo2 may each be adjusted either up or down using a single external resis- tor 2. Table 1 gives the adjustment range for both Vo1 and Vo2 for each model in the series as Va(min) and Va(max). Note that Vo2 must always be lower than Vo1 3. Vo1 Adjust Up: To increase the output, add a resistor R4 between pin 16 (V1 Adjust) and pins 7-11 (GND) 2. Vo1 Adjust Down: Add a resistor (R3), between pin 16 (Vo1 Adjust) and pin 1 (Vo1 Sense) 2. Vo2 Adjust Up: Add a resistor R2 between pin 23 (Vo2 Adjust) and pins 7-11 (GND) 2. Vo2 Adjust Down: Add a resistor (R1) between pin 23 (Vo2 Adjust) and pin 22 (Vo2 Sense) 2. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor. Notes: 1. The output voltages, Vo1 and Vo2, may be adjusted independantly. 2. Use only a single 1% resistor in either the (R3) or R4 location to adjust Vo1, and in the (R1) or R2 location to adjust Vo2. Place the resistor as close to the ISR as possible. 3. Vo2 must always be at least 0.2V lower than Vo1. 4. Vo2 on both the PT6921 and PT6931 models may be adjusted from 2.5V to 1.8V by simply connecting pin 22 (Vo2 Sense) to pin 23 (Vo2 Adjust). For more details, consult the data sheet. Table 1 PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS Output Bus Vo1 Vo2 Series Pt # Standard Case PT6921/22 PT6921 PT6922 Excalibur Case PT6931/32 PT6931 PT6932 PT6933 Adj. Resistor (R3)/R4 (R1)/R2 (R1)/R2 (R1)/R2 Vo(nom) 3.3V 2.5V 1.5V 1.8V Va(min) 2.3V 1.8V 1.2V 1.2V Va(max) 3.6V 3.0V 3.0V 3.0V Vr 1.02V 1.0V 1.0V 1.0V Ro (k Ω Ω Ω Ω Ω) 12.1 10.0 9.76 10.0 Rs (k Ω Ω Ω Ω Ω) 12.1 11.5 6.49 3.32 Figure 1 C 1 + C 2 + C 3 + R4 (R3) (R1) R2 L O A D L O A D Adj Down Adjust Up Vin COM CO V2 o V1 o PT6920 18 - 21 23 7 - 11 4,5,6 Vin V2 out GND V o 2(adj) V 1(sns) 1 16 Vo 1(adj) 12 - 15 V1 out V 2(sns) 22 STBY 3 Adjust V1 out Adjust V2 out 5. If Vo1 is increased above 3.3V, the minimum input voltage to the ISR must also be increased. The minimum required input voltage must be (Vo1 + 1.2)V or 4.5V, whichever is greater. Do not exceed 5.5V 6. Never connect capacitors to either the Vo1 Adjust or Vo2 Adjust pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. 7. Adjusting either voltage (Vo1 or Vo2) may increase the power dissipation in the regulator, and correspondingly change the maximum current available at either output. Consult the factory for application assistance. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameter from Table 1 for the output and model being adjusted. (R1) or (R3) = Ro (Va – Vr) –R s k Ω Vo – Va R2 or R4 = Vr . Ro – Rs k Ω Va – Vo Where: Vo = Original output voltage, (Vo1 or Vo2) Va = Adjusted output voltage Vr = The reference voltage from Table 1 Ro = The resistance value from Table 1 Rs = The series resistance from Table 1 |
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