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PT4662 Fiches technique(PDF) 13 Page - Texas Instruments |
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PT4662 Fiches technique(HTML) 13 Page - Texas Instruments |
13 / 17 page Application Notes For technical support and further information, visit http://power.ti.com Adjusting the Output Voltage of the PT4660 & PT4680 Series of Dual-Output Converters The dual output voltages from the PT4660 (48-V Bus), and PT4680 (24-V Bus) series of DC/DC converters can be independently adjusted by up to 10 %, higher or lower than the factory trimmed pre-set voltage. The adjustment method requires the addition of a single external resistor 1. Table 3-1 gives the adjustment range of Vo1 and Vo2 for each model in the series as Va(min) and Va(max). Vo1 Adjust Down: Add a resistor (R1), between pin 13 (Vo1 Adj) and pin 12 (Vo1) 2. Vo1 Adjust Up: To increase the output, add a resistor R2 between pin 13 (Vo1 Adj) and pin 14 (COM) 2, 4. Vo2 Adjust Down: Add a resistor (R3) between pin 20 (Vo2 Adj) and pin 21 (Vo2) 2. Vo2 Adjust Up: Add a resistor R4 between pin 20 (Vo2 Adj) and pin 19 (COM) 2, 4. Refer to Figure 3-1 and Table 3-2 for both the placement and value of the required resistor. Notes: 1. Adjust resistors are not required if Vo1 and Vo2 are to remain at their respective nominal set-point voltage. In this case, Vo1 Adj (pin 13) and Vo2 Adj (pin 20) are left open-circuit 2. Use only a single 1% resistor in either the (R1) or R2 location to adjust Vo1, and in the (R3) or R4 location to adjust Vo2. Place the resistor as close to the converter as possible. Figure 3-1; Placement of Output Adjust Resistors 3. Vo2 must always be at least 0.3 V lower than Vo1. 4. The over-voltage protection threshold is fixed, and is set nominally 25 % above the set-point output voltage. Adjusting Vo1 or Vo2 higher will reduce the voltage margin between the respective steady-state output voltage and its over-voltage (OV) protection threshold. This could make the module sensitive to OV fault detection, as a result of random noise and load tran- sients. Note: An OV fault is a latched condition that shuts down both outputs of the converter. The fault can only be cleared by cycling one of the Enable control pins (EN1* / EN2), or by momentarily removing the input power to the module. 5. Never connect capacitors to either the Vo1 Adj or Vo2 Adj pins. Any capacitance added to these control pins will affect the stability of the respective regulated output. The adjust up and adjust down resistor values can also be calculated using the following formulas. Be sure to select the correct formula parameter from Table 3-1 for the output and model being adjusted. (R1) or (R3) = Ro · (Va – Vr ) – Rs k Ω (Vo – Va) R2 or R4 = Ro · Vr – Rs k Ω Va – Vo Where: Vo = Original output voltage, (Vo1 or Vo2) Va = Adjusted output voltage Vr = The reference voltage from Table 3-1 Ro = The resistance constant in Table 3-1 Rs = The series resistance from Table 3-1 PT4660 & PT4680 Series PT4660 +Vin EN 1* EN 2 –Vin Vo 1 adj Vo 2 adj Vo 1 Vo 2 COM 9–12 21–24 14–19 L O A D L O A D Vo 1 Vo 2 +V IN –V IN 20 13 1 4 3 2 COM * Inverted logic R2 (R1) (R3) R4 |
Numéro de pièce similaire - PT4662 |
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Description similaire - PT4662 |
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