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PTH08T230WAD Datasheet(PDF) 20 Page - Texas Instruments |
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PTH08T230WAD Datasheet(HTML) 20 Page - Texas Instruments |
20 / 36 page www.ti.com C − Capacitance − µF 20 10 9 8 7 30 40 50 60 Without TurboTrans With TurboTrans C − Capacitance − µF 20 10 9 8 7 30 40 50 60 Without TurboTrans With TurboTrans R TT =40x 1-(C /1000) O 5 x(C /1000)-1 O (k ) W [] (4) PTH08T230W, PTH08T231W SLTS265F – NOVEMBER 2005 – REVISED MAY 2007 PTH08T230W Type C Capacitors 12-V INPUT 5-V INPUT Figure 16. Capacitor Type C, 5000 < C( µF) x ESR(mΩ) ≤ Figure 17. Capacitor Type C, 5000 < C( µF) x ESR(mΩ) ≤ 10,000 10,000 (e.g. OS-CON) (e.g. OS-CON) Table 6. Type C TurboTrans CO Values and Required RTT Selection Table Transient Voltage Deviation (mV) 12 V Input 5 V Input CO RTT CO RTT 25% load step 50% load step 75% load step Minimum Required Minimum Required (1.5 A) (3 A) (4.5 A) Required Output TurboTrans Required Output TurboTrans Capacitance ( µF) Resistor (k Ω) Capacitance ( µF) Resistor (k Ω) 75 150 225 200 open 200 open 60 120 180 230 205 250 121 50 100 150 300 56.2 310 49.9 40 80 120 390 25.5 400 24.3 30 60 90 570 9.31 580 8.87 25 50 75 720 4.32 730 4.12 20 40 60 960 0.422 980 0.205 15 30 45 3100 short 4000 short RTT Resistor Selection The TurboTrans resistor value, RTT can be determined from the TurboTrans programming equation: Where CO is the total output capacitance in µF. CO values greater than or equal to 1000 µF require RTT to be a short, 0 Ω. To ensure stability, a minimum amount of output capacitance is required for a given RTT resistor value. The value of RTT must be calculated using the minimum required output capacitance determined from the capacitor transient response charts above. 20 Submit Documentation Feedback Copyright © 2005–2007, Texas Instruments Incorporated Product Folder Link(s): PTH08T230W PTH08T231W |
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