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PTH08T240FAST Datasheet(PDF) 19 Page - Texas Instruments |
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PTH08T240FAST Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 37 page ![]() PTH08T240F Type C Capacitors (12-V) 10 7 6 5 4 3 2 1 9 8 C - Capacitance - mF 10 7 6 5 4 3 2 1 9 8 C - Capacitance - mF ( ) ( ) ( ) O TT O 40 1 C 5000 R k C 1000 1 é ù ´ - ë û = W é ù - ë û (5) PTH08T240F www.ti.com........................................................................................................................................ SLTS277C – DECEMBER 2006 – REVISED DECEMBER 2008 12-V INPUT; VO ≥ (VI ÷ 11) 12-V INPUT; VO < (VI ÷ 11) Figure 20. VO ≥ (VI ÷ 11) Figure 21. VO < (VI ÷ 11) Capacitor Type C Capacitor Type C Table 7. Type C TurboTrans CO Values and Required RTT Selection Table Transient Voltage Deviation (mV) VO ≥ VI/11 VO < VI/11 25% load step 50% load step 75% load step CO RTT CO RTT (2.5 A) (5 A) (7.5 A) Minimum Required Minimum Required Required Output TurboTrans Required Output TurboTrans Capacitance ( µF) Resistor (k Ω) Capacitance ( µF) Resistor (k Ω) 25 50 75 1000 open 1000 open 20 40 60 1000 open 1450 63.4 18 36 54 1000 open 1850 29.4 15 30 45 1200 150 2800 9.76 12 24 36 1600 45.3 4600 0.887 10 20 30 2050 22.6 exceeds max - 8 16 24 2750 10.2 exceeds max - 5 10 15 5400 short exceeds max - RTT Resistor Selection The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 5. Where CO is the total output capacitance in µF. CO values greater than or equal to 5000 µF require RTT to be a short, 0 Ω. (RTT results in a negative value when CO > 5000 µF). To ensure stability, the value of RTT must be calculated using the minimum required output capacitance determined from the capacitor transient response charts above. Copyright © 2006–2008, Texas Instruments Incorporated Submit Documentation Feedback 19 Product Folder Link(s): PTH08T240F |
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