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PTH04T231W Datasheet(PDF) 19 Page - Texas Instruments |
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PTH04T231W Datasheet(HTML) 19 Page - Texas Instruments |
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19 / 35 page ![]() www.ti.com 40 30 20 4 10 With TurboTrans Without TurboTrans 6 5 8 7 9 C − Capacitance − µF C − Capacitance − µF Without TurboTrans With TurboTrans 40 30 20 4 10 6 5 8 7 9 R TT + 40 1 * CO 1250 C O 250 * 1 kW (3) PTH04T230W, PTH04T231W SLTS271A – SEPTEMBER 2006 – REVISED OCTOBER 2006 PTH04T230W Type B Capacitors 5-V Input 3.3-V Input Figure 12. Capacitor Type B, 1000 < C( µF) x ESR(mΩ) ≤ Figure 13. Capacitor Type B, 1000 < C( µF) x ESR(mΩ) ≤ 5000 5000 (e.g. Polymer-Tantalum) (e.g. Polymer-Tantalum) Table 5. Type B TurboTrans CO Values and Required RTT Selection Table Transient Voltage Deviation (mV) 5-V Input 3.3-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) 60 120 180 250 open 250 open 50 100 150 300 165 300 165 40 80 120 400 46.4 400 46.4 30 60 90 570 16.9 570 16.9 25 50 75 710 9.31 720 9.09 20 40 60 940 3.57 960 3.24 15 30 45 1520 short 1500 short 12 24 36 3200 short 3100 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 1250 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. 19 Submit Documentation Feedback |
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