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PT4506 Datasheet(PDF) 5 Page - Texas Instruments |
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PT4506 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 8 page  Application Notes For technical support and more information, see inside back cover or visit www.ti.com Adjusting the Output Voltage of the PT4500/ PT4520 Series of Isolated DC/DC Converters The factory pre-set output voltage of TI’s PT4500 and PT4520 series of isolated DC/DC converters may be adjusted within a nominal ±10% range. Adjustment is made from the secondary side of the regulator1 with a single external resistor. For the input voltage range specified in the data sheet Table 2-1 gives the allowable adjustment range for each model, as Vo (min) and Vo (max). Adjust Up: An increase in the output voltage is obtained by adding a resistor, R2 between Vo Adjust (pin 12), and –Vout (pin 7, 8). Adjust Down: Add a resistor (R1), between Vo Adjust (pin 12), and +Vout (pin 9, 10). Refer to Figure 2-1 and Table 2-2 for both the placement and value of the required resistor, (R1) or R2. Notes: 1. The PT4500 and PT4520 series of DC/DC converters incorporate isolation between the ±Vin and ±Vo terminals. Adjustment of the output voltage is made to the regulation circuit on the secondary or output side of the converter. 2. The maximum rated output power for this series is 20W. An increase in the output voltage may therefore require a corresponding reduction in the maximum output current ( see Table 2-1). The revised maximum output current must be determined as follows. Io(max) = 20 A, or 5A, whichever is less. Va Where Va is the adjusted ouput voltage. 3. Use only a single 1% resistor in either the (R1) or R2 location. Place the resistor as close to the module as possible. Table 2-1 DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # 48V Bus PT4529 PT4526 PT4527 PT4528 PT4521 PT4522 PT4523 PT4524 24V Bus PT4509 PT4506 PT4507 PT4508 PT4501 PT4502 PT4503 PT4504 Max Current 2 5A 5A 5A 5A 5A 4A 1.6A 1.3A Vo(nom) 1.2 1.5 1.8 2.5 3.3 5.0 12.0 15.0 Va(min) 1.05 1.35 1.62 2.25 2.95 4.5 10.8 13.5 Va(max) 1.35 1.65 1.98 2.75 3.65 5.5 13.2 16.5 Vr 0.6125 1.225 1.225 1.225 1.225 2.5 2.5 2.5 Ko (V·k Ω Ω Ω Ω Ω) 34.66 67.07 69.7 64.2 69.3 125.2 139.8 137.6 Rs (k Ω Ω Ω Ω Ω) 150.0 43.2 110.0 187.0 187.0 187.0 110.0 90.9 Figure 2-1 (R1) Adj Down R2 Adjust Up +V in – V in +V o – V o PT4500/4520 + Vout –Vout +Vin –Vin Remote On/Off V o (adj) 1 2, 3 4, 5 9,10 7, 8 12 4. Never connect capacitors to Vo adjust. Any capacitance added to the Vo adjust control pin will affect the stability of the converter. The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = Ko(Va – Vr) – R s k Ω Vr (Vo – Va) R2 = Ko – Rs k Ω (Va – Vo) Where Vo = Original output voltage Va = Adjusted output voltage Vr = Reference voltage (Table 2-1) Ko = Multiplier constant (Table 2-1) Rs = Internal series resistance (Table 2-1) PT4500/4520 Series |
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