Electronic Components Datasheet Search |
|
TPS54010 Datasheet(PDF) 11 Page - Texas Instruments |
|
TPS54010 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page www.ti.com I CIN + I OUT(MAX) 2 (3) SWITCHING FREQUENCY OUTPUT FILTER COMPONENTS R4(kW) + 500 kHz ƒs(kHz) 100 kW (1) Inductor Selection INPUT CAPACITORS L MIN + V OUT V in(MAX) * V OUT V IN(MAX) K IND I OUT Fsw (4) DVPVIN + I OUT(MAX) 0.25 C BULK ƒsw ) I OUT(MAX) ESR MAX I L(RMS) + I2 OUT(MAX) ) 1 12 V OUT V in(MAX) * V OUT V IN(MAX) L OUT Fsw 0.8 2 TPS54010 SLVS509B – MAY 2004 – REVISED JUNE 2005 (continued) DESIGN PARAMETER EXAMPLE VALUE Operating frequency 700 kHz In this case, the input ripple voltage would be 155 mV and the RMS ripple current would be 7 A. The maximum voltage across the input capacitors would be Vin max plus delta Vin/2. The chosen bulk The switching frequency can be set to either one of capacitor, a Sanyo POSCAP 6TPD330M is rated for two internally programmed frequencies or set to a 6.3 V and 4.4 A of ripple current; two bypass externally programmed frequency. With the RT pin capacitors, TDK C3225X5R1C106M are each rated open, setting the SYNC pin at or above 2.5 V selects for 16 V, and the ripple current capacity is greater 550-kHz operation, whereas grounding or leaving the than 3 A at the operating frequency of 700 kHz. Total SYNC pin open selects 350-kHz operation. For this ripple current handling is in excess of 10.4 A. It is design, the switching frequency is externally pro- important that the maximum ratings for voltage and grammed using the RT pin. By connecting a resistor current are not exceeded under any circumstance. (R4) from RT to AGND, any frequency in the range of 250 to 700 kHz can be set. Use Equation 1 to determine the proper value of RT. Two components need to be selected for the output filter, L1 and C2. Because the TPS54010 is an externally compensated device, a wide range of filter In this example circuit, R4 is calculated to be 71.5 k Ω component types and values can be supported. and the switching frequency is set at 700 kHz. To calculate the minimum value of the output induc- The TPS54010 requires an input de-coupling capaci- tor, use Equation 4 tor and, depending on the application, a bulk input capacitor. The minimum value for the de-coupling capacitor, C9, is 10 µF. A high-quality ceramic type X5R or X7R is recommended. The voltage rating should be greater than the maximum input voltage. Additionally, some bulk capacitance may be needed, KIND is a coefficient that represents the amount of especially if the TPS54010 circuit is not located within inductor ripple current relative to the maximum output about 2 inches from the input voltage source. The current. For designs using low ESR output capacitors value for this capacitor is not critical but it also should such as ceramics, use KIND = 0.3. When using higher be rated to handle the maximum input voltage includ- ESR output capacitors, KIND = 0.2 yields better ing ripple voltage, and should filter the output so that results. input ripple voltage is acceptable. For this design example, use KIND = 0.2 to keep the This input ripple voltage can be approximated by inductor ripple current small. The minimum inductor Equation 2: value is calculated to be 0.44 µH. For the output filter inductor, it is important that the RMS current and saturation current ratings not be exceeded. The RMS inductor current can be found (2) from Equation 5: Where IOUT(MAX) is the maximum load current. The TPS54010 requires an input de-coupling capaci- tor and, depending on the application, a bulk input capacitor. ƒ sw is the switching frequency, C(BULK) is (5) the bulk capacitor value and ESRMAX is the maximum series resistance of the bulk capacitor. and the peak inductor current can be found from Equation 6 The maximum RMS ripple current also needs to be checked. For worst-case conditions, this can be approximated by Equation 3: 11 |
Similar Part No. - TPS54010_16 |
|
Similar Description - TPS54010_16 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |