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PT6121 Datasheet(PDF) 3 Page - Texas Instruments |
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PT6121 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 7 page  For assistance or to order, call (800) 531-5782 3 Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com Application Notes PT6100/6120/6210/6220/6300/6320 Series Adjusting the Output Voltage of Power Trends’ Wide Input Range Bus ISRs The output voltage of the Power Trends’ Wide Input Range 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 adjust) and pins 5-8 (GND). Adjust Down: Add a resistor (R1), between pin 12 (Vo adjust) and pins 9-11(Vout). Refer to Figure 1 and Table 2 for both the placement and value of the required resistor; either (R1) or R2 as appropriate. Notes: 1. Use only a single 1% resistor in either the (R1) or R2 loca- tion. Place the resistor as close to the ISR as possible. 2. Never connect capacitors from Vo adjust to either GND or Vout. Any capacitance added to the Vo adjust pin will affect the stability of the ISR. 4. Adjustments to the output voltage may place additional limits on the maximum and minimum input voltage for the part. The revised maximum and minimum input voltage limits must comply with the following requirements. Note that the minimum input voltage limits are also model depen- dant. Vin (max) = (8 x Va)V or *30/38V, whichever is less. *Limit is 30V when inhibit function is active. PT6x0x/PT6x1x series: Vin (min) = (Va + 4)V or 9V, whichever is greater. PT6x2x series: Vo <10V; Vin (min) = (Va + 2.0)V or 7.0V, whichever is greater. Vo ≥10V; Vin (min) = (Va + 2.5)V Figure 1 The values of (R1) [adjust down], and R2 [adjust up], can also be calculated using the following formulae. Ro (Va – 1.25) (R1) = Vo – Va kΩ 1.25 Ro kΩ R2 = Va – Vo Where: Vo = Original output voltage Va = Adjusted output voltage Ro = The resistance value fromTable 1 Table 1 ISR ADJUSTMENT RANGE AND FORMULA PARAMETERS 1Adc Rated PT6102 PT6101 PT6103 PT6122 PT6121 2Adc Rated PT6213 PT6212 PT6214 PT6223 PT6222 3Adc Rated PT6303 PT6302 PT6304 PT6323 PT6322 Vo (nom) 3.3 5.0 5.0 12.0 Va (min) 1.89 1.88 2.18 2.43 Va (max) 6.07 11.25 8.5 22.12 Ro (k Ω Ω Ω Ω Ω) 66.5 150.0 90.9 243.0 R2 Adjust Up C1 1 µF Ceramic (Optional) C2 100 µF (Req'd) Vo COM COM Vin + (R1) Adj Down PT6100/6200/6300 9,10,11 12 5,6,7,8 2,3,4 Vin V o G N D Vo(adj) More Application Notes |
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