pass element

pass element

[′pas ‚el·ə·mənt]
(electronics)
Controlled variable resistance device, either a vacuum tube or power transistor, in series with the source of direct-current power; the pass element is driven by the amplified error signal to increase its resistance when the output needs to be lowered or to decrease its resistance when the output must be raised.
References in periodicals archive ?
The bus pass element of the school transport budget was overspent in 2010/11 by pounds 32,000, and long term demand is expected to rise.
The MIC2044/45 has improved that by integrating a unique, high-efficiency NMOS pass element with control circuitry into a TSSOP package to control load currents in excess of 6A.
In addition, AP9060's use of a very low resistance p-channel MOSFET as the pass element ensures that any EMI issues are removed.
She will examine the proposals drawn up by council benefits and admissions manager Sue Heawood, who states: "The bus pass element of the school transport budget was overspent in 2009/10 by pounds 91,000," adding, "While some of this overspend will be reduced in 2010/11 through savings.
Used in conjunction with a series pass element and a programming sense resistor, it enables design engineers to consistently and predictably isolate system faults.
For the pass element, a high drain current 60V N-channel MOSFET has been used instead of a bipolar transistor to reduce the overall bias current.
The new device significantly reduces conduction losses associated with the pass element to dramatically improve the efficiency of the entire system.
The LX2201's design includes an internal pass element that can function as a reverse direction load switch, full-capacity charging with always-cool running, a conditioning mode for deep discharge, topping charge for long periods of non-use and a highly tolerant 5 volt plus 10 percent wall supply regulation.
PMOS LDO regulators are excellent candidates for applications that require ultra low dropout without high quiescent current compared to bipolar pass element transistors.
The ISL6291 provides a low-cost, highly integrated, charger solution that eliminates the need for an external pass element, current sensing resistor or reverse blocking diode.
With the addition of only a pass element, the HV100/HV101 assure safe hotswapping on the backplane power supply rail for positive or negative voltages in telecom, networking and storage applications.