Product Details
Product Description
Product Description
Focus on DCS, PLC, robot control system and large servo system.
Main products: various modules / cards, controllers, touch screens, servo drivers.
Advantages: supply of imported original products, professional production parts,
Fast delivery, accurate delivery time,
The main brands include ABB Bailey, Ge / fuanc, Foxboro, Invensys Triconex, Bently, A-B Rockwell, Emerson, ovation, Motorola, xyvom, Honeywell, Rexroth, KUKA, Ni, Deif, Yokogawa, Woodward, Ryan, Schneider, Yaskawa, Moog, prosoft and other brands
If L1 and L2 are wound on the same core, then L1 = L2 = L. All the equations above will hold true if the inductance is replaced by 2L. A good choice for transformer with equal turns is Coiltronics CTX series Octopack. 8.2.2.2.4 Sense Resistor Selection The peak current through the switch, ISWPEAK, can be adjusted using the current sense resistor, RSEN, to provide a certain output current. Resistor RSEN can be selected using the formula: (57) 8.2.2.2.5 SEPIC Capacitor Selection The selection of SEPIC capacitor, CS, depends on the rms current. The rms current of the SEPIC capacitor is given by: (58) The SEPIC capacitor must be rated for a large ACrms current relative to the output power. This property makes the SEPIC much better suited to lower power applications where the rms current through the capacitor is small (relative to capacitor technology). The voltage rating of the SEPIC capacitor must be greater than the maximum input voltage. Tantalum capacitors are the best choice for SMT, having high rms current ratings relative to size. Ceramic capacitors could be used, but the low C values will tend to cause larger changes in voltage across the capacitor due to the large currents, and high C value ceramics are expensive. Electrolytics work well for through hole applications where the size required to meet the rms current rating can be accommodated. There is an energy balance between CS and L1, which can be used to determine the value of the capacitor. The basic energy balance equation is: (59) Where (60) is the ripple voltage across the SEPIC capacitor, and (61) is the ripple current through the inductor L1. The energy balance equation can be solved to provide a minimum value for CS: (62) 8.2.2.2.6 Input Capacitor Selection Similar to a boost converter, the SEPIC has an inductor at the input. Hence, the input current waveform is continuous and triangular. The inductor ensures that the input capacitor sees fairly low ripple currents. However, as the input capacitor gets smaller, the input ripple goes up. The rms current in the input capacitor is given by: (63) The input capacitor should be capable of handling the rms current. Although the input capacitor is not as critical in a SEPIC application, low values can cause impedance interactions. Therefore a good quality capacitor should be chosen in the range of 100 µF to 200 µF. If a value lower than 100 µF is used, then problems with impedance interactions or switching noise can affect the LM3481. To improve performance, especially with VIN below 8 V, it is recommended to use a 20Ω resistor at the input to provide a RC filter. This resistor is placed in series with the VIN pin with only a bypass capacitor attached to the VIN pin directly (see Figure 34). A 0.1 µF or 1 µF ceramic capacitor is necessary in this configuration.
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