The circuit of Figure 1 supports the many portable applications in which a microprocessor (µP) or microcontroller (µC) controls charging of the battery. IC1 is a step-up switching regulator that boosts VIN (nominally 5V) as nec...

Among 2-cell boost regulators, five watts (5V at 1A) is "high power." But, obtaining even 5W from a 2-cell or 3-cell battery is not a trivial problem. Peak currents exceed 2A, and the small voltage drops they produce in the power devices, ...

The DC-DC converter circuit of Figure 1 substitutes a voltage tripler in place of the external inductor and diode normally associated with switching regulator IC1. Inverting and noninverting drivers in the MOSFET-driver chip (IC2) activate...

Numerous diverse and conflicting constraints burden the designer of small hand-held products. Aside from the customary restrictions on size and weight, these constraints include cost limitations, strict time schedules, battery-life goals m...

Electronic equipment is increasingly becoming smaller, lighter, and more functional, thanks to the push of technological advancements and the pull from customer demand. The result of these demands has been rapid advances in battery technol...

電源集成電路制雙電壓...

High-Volta...

Global-system-for-mobile-communication phones have a subscriber-identification module (SIM) that allows local wireless providers to recognize the user and his or her billing information. Although most SIMs are changing to 3V operation, the...

Placing a load-disconnect circuit on the output of a bootstrapped step-up regulator allows the regulator to start with load currents much higher than would otherwise be possible (Figure 1). During shutdown, the disconnect completely isolat...

The circuit in Figure 1 converts a regulated 5V input to an isolated 5V output with 1A current-output capability. IC1, a push-pull transformer driver, powers a pair of cross-coupled power MOSFETs in a flip-flop-like configuration. In turn,...

Providing electrical power for CPUs and other high-density logic has never been easy, though it appeared for awhile that technology would eventually reduce the power needed for computing tasks. Although technology advances have been rapid,...

The majority of asynchronous, inductor-based boost converters (the step-up switching types) exhibit a DC-current path between power source and load (Figure 1). This path can have two undesirable consequences: First, if a grounded output or...

Analyzing noise from the perspective of portable-system design will help you in making appropriate trade-off in power-supply design. RF-communicating computers and other new mobile systems can act as portable generators of unwanted...

Isolated power supplies have been around since the beginning of the electronics industry. As power-supply designs change to keep pace with increased efficiency and power-density demands, isolated feedback is crucial to maintaining safety....

國內(nèi)機床企業(yè)名錄 珠江機床有限公司 北...

AT89S51引腳圖,AT89S51單片機引腳說明及管腳定義  ...

AT89C2051高性能8位單片機（ AT89C2051引腳圖）  ...

at89c52單片機引腳說明,AT89C52高性能8位單片機...

本文為您介紹at89s52單片機引腳圖及引腳說明，at89S52特點及其功能。at89S52，高性能的8位單片機。...

at89s52串口電路圖 ...