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PT5525C Datasheet(PDF) 4 Page - Texas Instruments |
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PT5525C Datasheet(HTML) 4 Page - Texas Instruments |
4 / 9 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com PT5500/5520 Series Adjusting the Output Voltage of the PT5500/20 Series of Excalibur Step-Down ISRs The output voltage of both the PT5500 and PT5520 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 for either series as Va (min) and Va (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor R2, between pin 5 (Vo adj) and pin 3 (GND). Adjust Down: Add a resistor (R1), between pin 5 (Vo adj) and pin 4 (Vout). Figure 1 The values of (R 1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. Refer to Figure 1 and Table 2 for both the placement and value of the required resistor; either (R 1) or R2 as appropriate. (R1) = Ro (Va – 0.9) – Rs k Ω Vo – Va R2 = 0.9 Ro – Rs k Ω Va – Vo Where: Vo = Original output voltage Va = Adjusted output voltage Ro = The resistance value from Table 1 Rs = The series resistance from Table 1 Table 1 ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS 3.0 Adc Rated PT5501 PT5502 PT5503 PT5504 PT5505 PT5506 PT5507 1.5 Adc Rated PT5521 PT5522 PT5523 PT5524 PT5525 PT5526 PT5527 Vo (nom) 3.3 2.5 2.0 1.8 1.5 1.2 1.0 Va (min) 2.88 1.97 1.64 1.5 1.3 1.08 0.97 Va (max) 3.5 2.95 2.45 2.25 1.95 1.65 1.45 Ro (k Ω Ω Ω Ω Ω) 10.0 10.0 10.0 10.0 10.0 10.0 10.2 Rs (k Ω) 49.9 20.0 20.0 20.0 20.0 20.0 20.0 R2 Adjust Up C1 1 µF Ceramic (Optional) C2 100 µF (Req'd) +V O COM COM +V IN + (R1) Adj Down PT5500 2 35 4 Vin V o Vo(adj) GND 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 adj to either GND or Vout. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 3. For each model, adjustments to the output voltage may place additional limits on the minimum input voltage. The revised minimum input voltage must comply with the following requirement. Vin(min) = (Va + 0.5)V or as specified in the data sheet, whichever is greater. |
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