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TL2575-12 Datasheet(PDF) 13 Page - Texas Instruments |
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TL2575-12 Datasheet(HTML) 13 Page - Texas Instruments |
13 / 34 page TL2575-05 7-V to 40-V Unregulated DC Input CIN 100 µF + +VIN 1 3 GND 5 ON/OFF D1 1N5819 OUTPUT 2 L1 330 µH COUT 330 µF + FEEDBACK 4 5-V Regulated Output 1-A Load L2 20 µH C1 100 µF + Optional Output Ripple Filter TL2575, TL2575HV www.ti.com SLVS638C – JANUARY 2006 – REVISED NOVEMBER 2014 10 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 10.1 Typical Application Pin numbers are for the KTT (TO-263) package. Figure 12. Typical Application Circuit (Fixed Version) 10.1.1 Design Requirements • Input capacitor for stability • Output capacitor for loop stability and ripple filtering • Catch diode to filter noise • Output inductor depending on the mode of operation 10.1.2 Detailed Design Procedure 10.1.2.1 Input Capacitor (CIN) For stability concerns, an input bypass capacitor (electrolytic, CIN ≥ 47 μF) needs to be located as close as possible to the regulator. For operating temperatures below –25°C, CIN may need to be larger in value. In addition, since most electrolytic capacitors have decreasing capacitances and increasing ESR as temperature drops, adding a ceramic or solid tantalum capacitor in parallel increases the stability in cold temperatures. To extend the capacitor operating lifetime, the capacitor RMS ripple current rating should be calculated as shown in Equation 1. IC,RMS > 1.2 (ton / T) ILOAD where • ton/T = VOUT/VIN {buck regulator} • ton/T = |VOUT|/(|VOUT| + VIN) {buck-boost regulator} (1) 10.1.2.2 Output Capacitor (COUT) For both loop stability and filtering of ripple voltage, an output capacitor is required, again in close proximity to the regulator. For best performance, low-ESR aluminum electrolytics are recommended, although standard aluminum electrolytics may be adequate for some applications as shown in Equation 2. Output ripple voltage = (ESR of COUT) × (inductor ripple current) (2) Copyright © 2006–2014, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: TL2575 TL2575HV |
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