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PT6624 Datasheet(PDF) 3 Page - Texas Instruments |
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PT6624 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 19 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com PT6620 Series Adjusting the Output Voltage of the PT6620 6 A, 12-V Bus Converter Series The output voltage of the Power Trends PT6620 Series ISRs may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. Table 1 accordingly gives the allowable adjustment range for each model in the series as Va (min) and Va (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between Vo Adjust (pin 14) and GND (pins 7-10). Adjust Down: Add a resistor (R1), between Vo Adjust (pin 14 ) and Vout (pins 11-13). Refer to Figure 1 and Table 2 for both the placement and value of the required resistor, either (R1) or R2 as appropriate. Notes: 1. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the ISR as possible. 2. Never connect capacitors from Vo Adjust to either GND, Vout, or the Remote Sense pin. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is being used, connecting the resistor (R1) between Vo Adjust (pin 14) and Remote Sense (pin 1) can benefit load regulation. 4. The minimum input voltage required by the part is Vout + 3, or 9 V, whichever is higher. Figure 1 C in + C out + (R1) Adj Down R2 Adjust Up Vo COM COM Vin PT6620 11,12,13 14 7,8,9,10 4,5,6 Vin V o GND Vo(adj) STBY 3 Vsense 1 L O A D The values of (R 1) [adjust down], and R2 [adjust up], can also be calculated using the following formulae. Ro (Va – 1.25) (R1) = (Vo – Va) – Rs kΩ 1.25 Ro – Rs kΩ R2 = Va - Vo Where: Vo = Original output voltage Va = Adjusted output voltage Ro = The resistance value in Table 1 Rs = The series resistance from Table 1 Table 1 PT6620 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # PT6622 PT6623 PT6621 PT6624 PT6625 PT6626 Vo (nom) 1.5 V 2.5 V 3.3 V 3.6 V 5 V 9.0 V Va (min) 1.4 V 1.9 V 2.3 V 2.5 V 2.9 V 5.2 V Va (max) 2.7 V 3.7 V 4.5 V 4.8 V 6.5 V 10 V Ro (k Ω Ω Ω Ω Ω) 4.99 10.0 12.1 12.1 16.2 12.1 Rs (k Ω Ω Ω Ω Ω) 2.49 4.99 12.1 12.1 12.1 12.1 |
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