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TPS5420DG4 Fiches technique(PDF) 11 Page - Texas Instruments |
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TPS5420DG4 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 20 page www.ti.com Design Procedure DVIN = () IOUT(MAX) x0.25 +IOUT(MAX) MAX xESR CBULK SW x ƒ (2) TPS5420 SLVS642A – APRIL 2006 – REVISED AUGUST 2006 APPLICATION INFORMATION (continued) The following design procedure can be used to select component values for the TPS5420. Alternately, the SWIFT™ Designer Software may be used to generate a complete design. The SWIFT™ Designer Software uses an iterative design procedure and accesses a comprehensive database of components when generating a design. This section presents a simplified discussion of the design process. To begin the design process, a few parameters must be determined. The designer must know the following: • Input voltage range • Output voltage • Input ripple voltage • Output ripple voltage • Output current rating • Operating frequency Design Parameters For this design example, use the following as the input parameters: DESIGN PARAMETER(1) EXAMPLE VALUE Input voltage range 10 V to 36 V Output voltage 5 V Input ripple voltage 300 mV Output ripple voltage 30 mV Output current rating 2 A Operating frequency 500 kHz (1) As an additional constraint, the design is set up to be small size and low component height. Switching Frequency The switching frequency for the TPS5420 is internally set to 500 kHz. It is not possible to adjust the switching frequency. Input Capacitors The TPS5420 requires an input decoupling capacitor and, depending on the application, a bulk input capacitor. The recommended value for the decoupling capacitor is 10 µF. A high quality ceramic type X5R or X7R is required. For some applications, a smaller value decoupling capacitor may be used, if the input voltage and current ripple ratings are not exceeded. The voltage rating must be greater than the maximum input voltage, including ripple. For this design, two 4.7 µF capacitors, C1 and C4 are used to allow for smaller 1812 case size to be used while maintaining a 50 V rating. This input ripple voltage can be approximated by Equation 2 : Where IOUT(MAX) is the maximum load current, fSW is the switching frequency, CI is the input capacitor value and ESRMAX is the maximum series resistance of the input capacitor. The maximum RMS ripple current also needs to be checked. For worst case conditions, this is approximated by Equation 3: 11 Submit Documentation Feedback |
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