![]() |
Electronic Components Datasheet Search |
|
TPS61000 Datasheet(PDF) 17 Page - Texas Instruments |
|
|
TPS61000 Datasheet(HTML) 17 Page - Texas Instruments |
17 / 25 page ![]() ESR OUT ESR V I R K OUT OUT BAT min OUT , 9 ± 9 C ¦ 9 9 u u ' u TPS61000, TPS61001, TPS61002, TPS61003 TPS61004, TPS61005, TPS61006, TPS61007 www.ti.com SLVS279D – MARCH 2000 – REVISED AUGUST 2015 Table 3. Recommended Inductors (continued) VENDOR PART NUMBER UP1B Series Coiltronics UP2B Series Murata LQH3N Series CD43 Series Sumida CD54 Series CDR74B Series TDK NLC453232T Series 10.2.2.4 Capacitor Selection The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero. where • f is the switching frequency • ΔV is the maximum allowed ripple. (5) With a chosen ripple voltage of 15 mV, a minimum capacitance of 10 µF is needed. The total ripple will be larger due to the ESR of the output capacitor. This additional component of the ripple can be calculated using the following equation: (6) An additional ripple of 30 mV is the result of using a tantalum capacitor with a low ESR of 300 m Ω. The total ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor. In this example, the total ripple is 45 mV. It is possible to improve the design by enlarging the capacitor or using smaller capacitors in parallel to reduce the ESR or by using better capacitors with lower ESR, like ceramics. For example, a 10-µF ceramic capacitor with an ESR of 50 m Ω is used on the evaluation module (EVM). Tradeoffs have to be made between performance and costs of the converter circuit. A 10-µF input capacitor is recommended to improve transient behavior of the regulator. A ceramic capacitor or a tantalum capacitor with a 100-nF ceramic capacitor in parallel placed close to the IC is recommended. 10.2.2.5 Rectifier Selection The rectifier diode has a major impact on the overall converter efficiency. Standard diodes are not suitable for low-voltage switched mode power supplies. A Schottky diode with low forward voltage and fast reverse recovery should be used as a rectifier to minimize overall losses of the dc-dc converter. The maximum current rating of the diode must be high enough for the application. The maximum diode current is equal to the maximum current in the inductor that was calculated in equation 3. The maximum reverse voltage is the output voltage. The chosen diode should therefore have a reverse voltage rating higher than the output voltage. Table 4. Recommended Diodes VENDOR PART NUMBER MBRM120LT3 Motorola Surface Mount MBR0520LT1 1N1517 Motorola Axial Lead RB520S-30 ROHM RB160L–40 Copyright © 2000–2015, Texas Instruments Incorporated Submit Documentation Feedback 17 Product Folder Links: TPS61000 TPS61001 TPS61002 TPS61003 TPS61004 TPS61005 TPS61006 TPS61007 |
Similar Part No. - TPS61000_15 |
|
Similar Description - TPS61000_15 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |