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PT6342 Datasheet(PDF) 7 Page - Texas Instruments |
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PT6342 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 11 page Application Notes For technical support and more information, see inside back cover or visit www.ti.com PT6340 Series Adjusting the Output Voltage of the PT6340 Excalibur 6 A, 12 V Bus Step-Down ISRs The output voltage of the PT6340 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 12 (Vo adj) and pins 5-8 (GND). Adjust Down: Add a resistor (R1), between pin 12 (Vo adj) and pins 9-11 (Vo). Figure 1 The values of (R1) [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 (R1) or R2 as appropriate. (R1) = Ro (Va – Vr) – Rs k Ω Vo – Va R2 = Vr · Ro – Rs k Ω Va – Vo Where: Vo = Original output voltage Va = Adjusted output voltage Vr = Reference voltage (Table 1) Ro = Resistance constant (Table 1) Rs = Internal series resistance (Table 1) Table 1 ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # PT6341 PT6342 PT6343 PT6244 PT6345 PT6346 Vo (nom) 5.0 3.3 2.5 1.8 1.5 1.2 Va (min) 4.0 2.8 2.2 1.7 1.45 1.1 Va (max) 5.5 3.8 3.0 2.3 2.0 1.45 Vr (V) 1.27 1.27 1.27 1.27 1.27 0.8 Ro (k Ω Ω Ω Ω Ω) 10.0 10.0 10.0 10.0 10.0 10.0 Rs (k Ω) 24.9 24.9 24.9 24.9 24.9 24.9 R2 Adjust Up C 2 +V O COM COM +V IN + (R1) Adj Down PT6340 2,3,4 5–812 9,10,11 Vin V o Vo(adj) GND C 1 + 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. |
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