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PT3344 Datasheet(PDF) 4 Page - Texas Instruments |
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PT3344 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 9 page  Application Notes For technical support and more information, see inside back cover or visit www.ti.com Adjusting the Output Voltage of Power Trends’ 30W Isolated DC/DC Converter Series The factory pre-set output voltage of Power Trends’ 30W series of isolated DC/DC converters may be adjusted within a nominal ±10% range. This is accomplished with the addition of a single external resistor. For the input voltage range specified in the data sheet, Table 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 18), and -Remote Sense (pin 13). See note 4. Adjust Down: Add a resistor (R1), between Vo adjust (pin 18), and +Remote Sense (pin 19). Refer to Figure 1 and Tables 2 & 3 for both the placement and value of the required resistor, (R1) or R2. 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 to Vo adjust. Any capacitance added to the Vo adjust control pin will affect the stability of the ISR. Table 1 DC/DC CONVERTER ADJUSTMENT RANGE AND FORMULA PARAMETERS Series Pt # AL Case: 24V Bus PT3341 PT3342 PT3343 PT3344 48V Bus PT3327 PT3325 PT3326 PT3321 PT3322 PT3323 PT3324 CU Case: 24V Bus PT4585 PT4581 PT4582 PT4583 PT4584 48V Bus PT4567 PT4565 PT4566 PT4561 PT4562 PT4571 PT4563 PT4564 Vo(nom) 1.8V 1.8V 2.0V 2.5V 3.3V 5.0V 9.0V 12.0V 15.0V Vo(min) 1.62V 1.62V 1.8V 2.25V 2.95V 4.5V 7.0V 10.8V 13.5V Vo(max) 2.5V 1.98V 2.2V 2.75V 3.65V 5.5V 10.0V 13.2V 16.5V Vr 1.225V 1.225V 1.225V 1.225V 1.225V 1.225V 2.5V 2.5V 2.5V Ko (V·k Ω Ω Ω Ω Ω) 69.58 69.58 62.47 42.33 68.89 68.71 133.25 135.9 137.5 Rs (k Ω Ω Ω Ω Ω) 80.6 80.6 150.0 121.0 150.0 121.0 110 90.9 80.6 Figure 1 (R1) Adj Down R2 Adj Up Cin 100 µF 100V (Optional) + Cout 330 µF + L O A D +V out -V out +V in -V in 30W Isolated 18 4, 5, 6 7, 8, 9 +Vin +Vout -Vin Vo(adj) Remote On/Off 2 Sns(+) 19 10 - 12 -Vout 14 - 17 Sns(-) 13 3. If the remote sense pins are not being used, the resistors (R1) and R2 can be connected to +Vout or -Vout respectively. 4. The adjusted output voltage, Va effectively sets the voltage across pins 13 and 19 (±Remote Sense). When using the remote sense pins, Vout (measured directly across pins 10– 12, and 14–17) can be significantly higher than Va, and may exceed Vo (max). If Va is adjusted upward of Vo(max), the the minimum input voltage is increased by the same percentage as Vout exceeds Vo(max). The values of (R 1) [adjust down], and R2 [adjust up], can also be calculated using the following formulas. (R1) = Ko (Va – Vr) – Rs 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 1) Ko = Multiplier constant (Table 1) Rs = Series resistance (Table 1) PT3320/3340/4560/4580 Series |
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