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TPS65148 Datasheet(PDF) 17 Page - Texas Instruments |
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TPS65148 Datasheet(HTML) 17 Page - Texas Instruments |
17 / 30 page D1 Q1 V ~-7V/20mA GL T1 BC857B -V S D3 D4 R14 5.6kW D2 BZX84C 7V5 C16 1 F/ 16V m C17 470nF C18 470nF V S 13.6V/500mA V 2.5Vto6V IN BAT54S Components Selection f p ´ ´ ´ C 1 X = 2 C (6) TPS65148 www.ti.com ........................................................................................................................................................................................................ SLVS904 – MAY 2009 Figure 21. Partially Regulated External Negative Capacitors (Charge Pumps) For best output voltage filtering a low ESR output capacitor is recommended. Ceramic capacitors have a low ESR value but depending on the application tantalum capacitors can be used as well. For every capacitor, the reactance value has to be calculated as follows: This value should be as low as possible in order to reduce the voltage drop due to the current flowing through it. The rated voltage of the capacitor has to be able to withstand the voltage across it. Capacitors rated at 50 V are enough for most of the applications. Typically a 470-nF capacitance is sufficient for the flying capacitors whereas bigger values like 1 µF or more can be used for the output capacitors to reduce the output voltage ripple. CAPACITOR COMPONENT SUPPLIER COMPONENT CODE COMMENTS 100 nF/0603 Taiyo Yuden UMK107 BJ 104KA Flying Cap 470 nF/0805 Taiyo Yuden UMK212 BJ 474KG Output Cap 1 1 µF/1210 Taiyo Yuden UMK325 BJ 105KH Output Cap 2 Diodes (Charge Pumps) For high efficiency, one has to minimize the forward voltage drop of the diodes. Schottky diodes are recommended. The reverse voltage rating must withstand the maximum output voltage VS of the boost converter. Usually a Schottky diode with 200 mA average forward rectified current is suitable for most of the applications. CURRENT VR VF / IF COMPONENT COMPONENT PACKAGE RATING IF SUPPLIER CODE TYPE 200 mA 30 V 0.5V / 30mA International Rectifier BAT54S SOT 23 Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Link(s) :TPS65148 |
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