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PTH08080W Datasheet(PDF) 10 Page - Texas Instruments |
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PTH08080W Datasheet(HTML) 10 Page - Texas Instruments |
10 / 19 page PTH08080W SLTS235D – FEBRUARY 2005 – REVISED SEPTEMBER 2013 www.ti.com Designing for Load Transients The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 1 A/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 those specified in the data sheet, the selection of output capacitors becomes more important. Review the minimum ESR in the characteristic data sheet for details on the capacitance maximum. Table 3. Recommended Input/Output Capacitors CAPACITOR CHARACTERISTICS QUANTITY 85°C CAPACITOR VENDOR/ EQUIVALENT VENDOR WORKING MAXIMUM PHYSICAL OUTPUT COMPONENT VALUE SERIES INPUT NUMBER VOLTAGE RIPPLE SIZE BUS SERIES (µF) RESISTANCE BUS(1) (V) CURRENT (mm) (Optional) (ESR) ( Ω) (Irms) (mA) Panasonic WA (SMT) 20 150 0.026 3700 10 × 10,2 1 ≤ 2 EEFWA1D151P FC (SMT) 25 220 0.150 670 10 × 10,2 1 1 EEVFC1E221P Panasonic SL 6.3 47 0.018 2500 7,3 × 4,3 N/R(2) ≤ 3 EEFCD0J470R SP-cap(SMT) 6.3 120 0.007 3500 7,3 × 4,3 N/R(2) ≤ 1 EEFSD0J121R United Chemi-con PXA 16 150 0.026 3400 10 × 7,7 1 ≤ 2 PXA16VC151MJ80TP (SMT) VI < 14 V PS 25 100 0.020 4300 10 × 12,5 1 ≤ 2 25PS100MJ12 LXZ 35 220 0.180 760 10 × 12,5 1 1 LXZ35VB221M10X12LL MVZ (SMT) 25 470 0.090 670 10 ×10 1 1 MVZ25VC471MJ10TP Nichicon UWG (SMT) 35 100 0.150 670 10 × 10 1 1 UWG1V101MNR1GS F559(Tantalum) 10 100 0.055 2000 7,7 × 4,3 N/R(3) ≤ 3 F551A107MN HD 25 220 0.072 760 8 × 11,5 1 1 UHD1E221MPR Sanyo Os-con\ POS-Cap 10 68 0.025 2400 7,3 × 4,3 N/R(2) ≤ 2 10TPE68M SVP (SMT) 20 150 0.020 4320 10 × 12,7 1 ≤ 1 20SVP150M SP 20 120 0.024 3110 8 × 10,5 1 ≤ 2 20SP120M AVX Tantalum TPS (SMD) 35 47 0.100 1430 7,3 × 4,3 × 2 ≤ 4 TPSV476M035R0100 25 47 0.100 1150 4,1 2 ≤ 4 TPSE476M025R0100 7,3 × 4,3 × VI < 13 V 4,1 Kemet T520 (SMD) 10 100 0.025 > 2000 7,3 × 5,7 × 4 N/R(2) ≤ 1 T520V107M010ASE025 AO-CAP 6.3 100 0.018 > 2900 7,3 × 5,7 × 4 N/R(2) ≤ 1 A700V107M006AT Vishay/Sprague 35 47 0.280 > 1000 7,3 × 6 × 4,1 2 ≤ 5 595D476X0035R2T 594D/SVP(SMD) 20 100 0.025 3200 8 × 12 1 ≤ 2 94SVP107X0020E12 94SS 20 150 0.030 3200 10 × 10,5 1 ≤ 2 94SS157X0020FBP Murata Ceramic X5R 16 47 0.002 > 1400 3225 1 (4) ≤ 3 GRM32ER61C476M VI < 14 V TDK ceramic X5R 6.3 47 0.002 > 1400 3225 N/R(2) ≤ 3 C3225X5R0J476MT VO < 5.5 V Kemet Ceramic X5R 6.3 47 0.002 > 1400 3225 N/R(2) ≤ 3 C1210C476K9PAC VO < 5.5 V TDK Ceramic X7R 25 10 0.002 > 1400 3225 1 (4) ≤ 4 C3225X7R1E106K Murata Ceramic X5R 25 10 0.002 > 1400 1 (4) ≤ 4 GRM32DR61E106KA12 Kemet 16 10 0.002 > 1400 1 (4) ≤ 4 C1210C106M4PAC VI < 14 V TDK Ceramic X7R 25 2.2 0.002 > 1400 3225 1 1 C3225X7R1E225KT/MT Murata Ceramic X7R 25 2.2 0.002 > 1400 1 1 GRM32RR71J225KC01L Kemet 25 2.2 0.002 > 1400 1 1 C1210C225K3RAC (1) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the regulator at a higher input voltage, select a capacitor with a higher voltage rating. (2) Not recommended (N/R). The voltage rating of this capacitor only allows it to be used for output voltages bus and voltage of < 5.5 V. (3) The voltage rating of the input capacitor must be selected for the desired operating input voltage range of the regulator. To operate the regulator at a higher input voltage, select a capacitor with a higher voltage rating. (4) Ceramic capacitors can be used to complement electrolytic types at the input bus by reducing high-frequency ripple current. 10 Submit Documentation Feedback Copyright © 2005–2013, Texas Instruments Incorporated Product Folder Links :PTH08080W |
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