Circuits

Download DC Power Supplies Power Management and Surge Protection for by Nihal Kularatna PDF

By Nihal Kularatna

As we more and more use digital units to direct our day-by-day lives, so grows our dependence on trustworthy strength resources to energy them. simply because glossy digital structures call for regular, effective, trustworthy DC voltage sources—often at a sub-1V level—commercial AC traces, batteries, and different universal assets not suffice.
New applied sciences additionally require complex recommendations to guard opposed to traditional and artifical mess ups. nonetheless, regardless of its value, functional info in this severe topic is still demanding to find.
Using basic, obtainable language to stability assurance of theoretical and functional facets, DC strength offers, strength administration and Surge safeguard info the necessities of strength electronics circuits appropriate to low-power structures, together with smooth moveable units. A precis of underlying ideas and crucial layout issues, it compares educational examine and guides and studies DC strength provide basics, together with linear and low-dropout regulators. content material additionally addresses universal switching regulator topologies, exploring resonant conversion approaches.
Coverage comprises different very important issues such as:
• keep watch over features and regulate theory
• electronic keep an eye on and keep an eye on ICs utilized in switching regulators
• strength administration and effort efficiency
• total strength conversion level and uncomplicated safeguard options for greater reliability
• Battery administration and comparability of battery chemistries and charge/discharge management
• Surge and temporary safeguard of circuits designed with smooth semiconductors in response to submicron measurement transistors
This really good layout source explores appropriate basic parts of strength assets, with a variety of mentioned references and dialogue of industrial parts and brands. despite their earlier event point, this knowledge will drastically reduction designers, researchers, and lecturers who, research, layout, and convey the workable new energy assets had to propel our sleek digital global.

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Additional resources for DC Power Supplies Power Management and Surge Protection for Power Electronic Systems

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6. , M. Robles-Bruce, and M. Scherer. 2010, August. The 2010 power management—general purpose analog service. Databeans Incorporated. 7. , and V. Strik. 2008. LDO design solves load transient problems. EE Times Asia, October 1–15, 1–3. 8. Lee, B. S. 1999. Technical review of low dropout regulator operation and performance. Texas Instruments, Application Report SLVA072. 9. King, B. M. 2000. Optimized LDO response to load transients requires the appropriate output capacitor and device performance, PCIM, September, 39.

15(a). In a well-designed LDO-based power supply, this transient fluctuation needs to be minimized. In order to improve on the transient behavior, there are many improvements incorporated into LDO chips. One such example is the use of a fast transient loop in LDOs such as TPS75433 from Texas Instruments for low and high currents [9]. In the majority of LDOs and quasi-LDOs (where a composite NPN-PNP pair is used as the pass device), the pass device or the driver is a lateral PNP. Even though a PNP is better at providing a lower dropout voltage than an NPN [10], a lateral PNP is a low-frequency cutoff device with a poor transient response.

Many processors frequently go through sleep and wakeup type sequences where the load currents vary suddenly from very low values to near maximum. These transitions in state-of-the-art products could generate current variations with current slew rates in the range of 10 A/µs to over 250 A/µs. 2 Important Secondary Specifications of LDOs Specification Description Output current range Output current handling capability of the LDO Load/line transient regulation A measure of speed of the LDO when the line voltage or load current fluctuates very fast Power supply rejection This is the ability of the LDO to reject AC ripple on the input side Current drawn from the power supply when the output is short circuited Short-circuit current limit Output capacitor range Value of the output capacitance to operate within the stability range Overshoot At startup or during load current transients, output voltage may overshoot.

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