13.07.2014

Dcdc boost converter design software

For example, the automotive battery presents one of the most challenging inputs to a power supply. Ensuring seamless transition between operational modes, Linear’s synchronous buck-boost converter LTC3115-1 uses a proprietary low-noise switching algorithm to deliver stable output voltage with high efficiency while input voltage can go above, below, or be equal to the output voltage over a very wide range. According to Linear, for automotive electronics the LTC3115-1 (Figure 1) provides uninterrupted operation through load dump transients and even in the harshest cold-crank conditions. Figure 1 shows a 5 V automotive supply for use in engine control units and for other critical functions including safety, fuel system, and drive train subsystems, where processors must remain powered without fail during the most severe input voltage transients. What is more, the buck-boost converter can be operated in the burst mode to reduce standby current and improve light load efficiency.
The efficiency performance for the application circuit in Figure 1 for load currents of 500 mA and 1 A with 3.3 to 40 V input voltage range is depicted in Figure 2. For applications that require an even wider input voltage range, Texas Instruments has readied an automotive-grade buck-boost regulator with integrated MOSFETs for voltage-mode control. If the application demands even wider input range, TI has developed a buck-boost switching regulator controller, designated LM5118 that can handle an input range of 3 to 75 V.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology.
A This document describes application examples and reference designs for theTPS61040 boost converter. As a result, a variety of products are available that can help power designers confront the challenges of generating a stable output voltage using a single low-cost inductor, despite very wide fluctuations in the input voltage range. Plus, its programmable high switching frequency, in conjunction with a low-noise PWM control algorithm, keeps switching noise and harmonics above the AM broadcast band with minimal electromagnetic (EMI) emissions under all operating conditions and modes.


This application circuit can use up to 2 MHz switching frequency to minimize footprint and eliminate interference with the AM broadcast band. In fact, based on thorough examination of the inductor, VCC bypass capacitor, and input and output filter capacitors, Linear Technology recommends component values with part numbers and supplier names.
It shows that when the input is close to the output, the circuit offers high efficiency, close to 93 percent for a load of 500 mA. The measured efficiency performance for these circuits is presented in the datasheet (again, see Reference 2).
Also, a low-EMI inductor with a ferrite-type closed core is preferred over other types, and it must be located away from low-power traces and components in the circuit. For more information on the parts discussed in this article, use the links provided to access product pages on the Digi-Key website. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology.
The following application example describes how toimplement the TPS61040 low-power, DC-DC boost converter to drive white light LEDs Also provided are design equations for calculating the proper resistor values for a whiteLED driver that includes provisions for dimming the LED brightness. However, the situation is different when it comes to industrial and automotive applications where input voltages can vary over a very wide range.
Switching frequencies up to 2 MHz are supported to allow the use of small-value inductors for miniaturization of the application circuit. The VCC rail provides power to the internal circuitry of the LTC3115-1 including the power device gate drivers and is ordinarily powered from the input rail via an internal linear regulator. Other features include output disconnect in shutdown, short-circuit protection, and internal soft-start. A typical application circuit with passive component values for a 5 V regulated output is illustrated in Figure 3.


The regulator control method is based on current mode control using an emulated current ramp. In addition, experts say that the automotive power rail is also subject to a variety of dynamic disturbances produced by changes in the engine, transitioning loads, and inductive transients in the wiring harness. In this application, diode D1 bypasses the internal linear regulator and delivers power to the VCC rail directly from the regulated output to improve efficiency and output current capability. While the selection of passive component values are system dependent, the manufacturer recommends using low-ESR capacitors on the output to minimize voltage ripple on the output due to transients. Likewise, all power (high-current) traces should be thick and as short as possible for reduced EMI. This is particularly advantageous in applications with higher switching frequencies, given that the increased gate drive current is provided more efficiently from the converter’s output rail than through the internal linear regulator. Also, the external inductor for the switch-mode regulator, connected between terminals L1 and L2, must be placed close to the terminals to minimize parasitic effects.
To evaluate the LM5118 controller IC, TI offers an evaluation board4 that is designed to provide the design engineer with a fully functional, emulated current-mode control, buck-boost power converter.
The evaluation board (Figure 4) provides a 12 V output with 3 A of output-current capability. Its wide input voltage range is from 75 to 5 V, with operation down to 3 V with some component changes.



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