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PT6523E Datasheet(PDF) 5 Page - Texas Instruments |
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PT6523E Datasheet(HTML) 5 Page - Texas Instruments |
5 / 12 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com PT6520 Series Adjusting the Output Voltage of the PT6520 Series of Integrated Switching Regulators The output voltage of the PT6520 series of integrated switching regulators (ISRs) may be adjusted higher or lower than the factory trimmed pre-set voltage with the addition of a single external resistor. 1 Table 1 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 pin 14 (Vo adjust) and pins 7-10 (GND). Adjust Down: Add a resistor (R1), between pin 14 (Vo ad- just) and pin 1 Vo(sense) 3. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor, either (R1) or R2 as appropriate. The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. Ro ( Va –Vr ) (R1) = Vo – Va – Rs kΩ Ro ·Vr – Rs kΩ R2 = Va – Vo Where: Vo = Original output voltage Va = Adjusted output voltage Vr = The reference voltage (Table 1) Ro = The multiplier resistance (Table 1) Rs = The internal series resistance (Table 1) Figure 1 C in + C out + (R1) Adj Down R2 Adj Up Vo COM Vin COM PT6520 11,12,13 14 7,8,9,10 4,5,6 Vin Vout GND Vo(adj) STBY 3 Vo(sense) 1 L O A D Table 1 ADJUSTMENT AND FORMULA PARAMETERS Series Pt # PT6527 PT6522 PT6526 PT6525 PT6523 PT6521 Vo (nom) 1.2 1.5 1.8 2.1 2.5 3.3 Va (min) 1.09 1.47 1.75 1.95 2.25 2.75 Va (max) 1.52 1.73 2.05 2.45 2.85 3.75 Vr (V) 0.8 1.27 1.27 1.27 1.27 1.27 Ro (k Ω Ω Ω Ω Ω) 10.0 10.2 10.0 10.0 10.0 10.0 Rs (k Ω Ω Ω Ω Ω) 24.9 49.9 49.9 33.2 33.2 24.9 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. Capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. If the Remote Sense feature is not being used, the resistor (R1) may be connected between pin 14 (Vo adjust) and pins 11–13 (Vout). 4. Adjusting the output voltage of the PT6523 (2.5V model) higher than the factory pre-trimmed output voltage may increase the minimum input voltage specified for the part. This model must comply with the following requirements. PT6523: Vin(min) = (Va + 0.5)V or 3.1V, whichever is greater. |
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