HP HP-Bench-Briefs-1986-05-06 free download

File name HP-Bench-Briefs-1986-05-06.pdf

Vdc and the duty cycle is 50 percent, instantaneously. The input will swing then the output voltage will be 1V0.5 negative until it goes one diode drop = 5 Vdc. This is fine as long as the below -Ein, at which time the rec- dc power supplies input voltage stays at 10 Vdc. What tifier D will start to conduct. During Barry Halm, HP New Jersey Division if Ein changes? If Ein increases then the time that the transistor is off, / Eout will also increase, unless the the load current is supplied by C duty cycle is changed. The duty cycle and by L through the rectifier. When , " & \bi' Basic Switching Regulator has to be decreased to bring the the transistor turns on, the rectifier I, &'& output down. This is usually accom- is reverse biased and stops conducting. The series pass regulator is the plished with a pulse-width modulator This rectifier is called the "catch" simplest but least efficient method that tracks the output and controls or "freewheeling" diode. of regulation. The output is kept the duty cycle. Therefore, with the constant by using the series pass pulse-width modulator, when Ein This is the basic series switching transistor as a variable resistance goes above 10 volts the transistor regulator. Any desired voltage less between the output and input. With on-time is decreased, which decreases than the input can be obtained by the advent of high-current, high- the duty cycle keeping the output varying the on-time or pulse-width speed, and low forward drop tran- voltage at 5 volts. This is how the of the transistor. This voltage reg- sistors, a more efficient means of