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PTH05010YAZT Datasheet(PDF) 9 Page - Texas Instruments |
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PTH05010YAZT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 18 page www.ti.com Designing for Very Fast Load Transients PTH03010Y PTH05010Y PTH12010Y SLTS223A–MARCH 2004–REVISED OCTOBER 2005 APPLICATION INFORMATION (continued) Table 1. Input/Output Capacitors (continued) Capacitor Characteristics Quantity Max Ripple Capacitor Vendor, Vendor Working Max ESR Physical Value Current Input Output Type/Series (Style) Part Number Voltage at 100 kHz Size (µF) at 85°CBus Bus (V) (Ω) (mm) (Irms) (mA) Panasonic, Poly-Aluminum: S/SE (SMD) 6.3 180 0.005 4000 7,3 × 4,3 × 2(2) N/R(3) EEFSE0J181R 4,2 Sanyo SEPC, Os-con (Radial) 6.3 470 0.008 5700 10 × 13 1 ≤1 6SEPC470M SVP, (SMD) 6.3 470 0.015 4200 11 × 11,9 1 ≤2 6SVP470M TPE, Poscap (SMD) 6.3 470 0.018 3500 7,3 × 4,3 1 ≤2 6TPE470MI AVX, Tantalum TPS (SMD) 10 470 0.045 1723 7,3 L × 5,7 W 1 ≤5 TPSE477M010R0045 × 4,1 H 10 470 0.060 1826 1 ≤5 TPSV477M010R0060 Kemet, Poly-Tantalum T520, (SMD) 10 330 0.040 1800 2 ≤5 T520X337M010AS 4,3 W × 7,3 L T530, (SMD) 10 330 0.010 5200 × 4H 2 ≤1 T530X337M010ASE010 Vishay-Sprague 595D, Tantalum (SMD) 10 470 0.100 1440 7,2 L × 6W 1 ≤5 595D477x0010r2t 94SP, Poly Aluminum (Radial) 10 470 0.015 4510 10 × 10 1 ≤2 94SP477X0010FBP 94SVP, Poly-Aluminum (SMD) 6.3 470 0.017 3960 8 × 12 1 ≤3 94SVP477X06R3E12 Kemet, Ceramic X5R (SMD) 16 10 0.002 – 3225 mm 1 ≤5 C1210C106M4PAC 6.3 47 3225 mm 1 ≤5 C1210C476K9PAC Murata, Ceramic X5R (SMD) 6.3 100 0.002 – 3225 mm 1(4) ≤3 GRM32ER60J107M 6.3 47 3225 mm 1(4) ≤5 GRM32ER60J476M 16 22 1(4) ≤5 GRM32ER61C226K 16 10 1(4) ≤5 GRM32DR61C106K TDK, Ceramic X5R (SMD) 6.3 100 0.002 – 3225 mm 1(4) ≤3 C3225X5R0J107MT 6.3 47 3225 mm 1(4) ≤5 C3225X5R0J476MT 16 22 1(4) ≤5 C3225X5R1C226MT 16 10 1(4) ≤5 C3225X5R1C106MT (2) A total capacitance of 360 µF is acceptable based on the combined ripple current rating. (3) N/R –Not recommended. The capacitor voltage rating does not meet the minimum derated operating limits. (4) A ceramic capacitor is recoommended to compliment electrolytic types at the input to further reduce high-frequency ripple current. The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 1A/µs. The typical voltage deviation for this load transient is given in the data sheet specification table using the optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter's regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with any dc/dc converter once the speed of the transient exceeds its bandwidth capability. If the target application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output capacitor decoupling. In these cases special attention must be paid to the type, value and ESR of the capacitors selected. If the transient performance requirements exceed that specified in the data sheet, or the total amount of load capacitance is above 8200 µF, the selection of output capacitors becomes more important. 9 |
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