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LM20146 6A, Adjustable Frequency Synchronous Buck Regulator
LM20146 6A, Adjustable Frequency Synchronous Buck Regulator

... The SS/TRK pin is a dual function pin that can be used to set the start up time or track an external voltage source. The start up or Soft-Start time can be adjusted by connecting a capacitor from the SS/TRK pin to ground. The Soft-Start feature allows the regulator output to gradually reach the stea ...
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... The junction voltage VBE is also a function of temp. As temp. increases, VBE decreases. But IB increases as shown in fig.2. The Ico is also a strong function of temp. Ico doubles for every 100c rise in temp. The net result of these increase in β, IB and Ico is that, Ic increases, shifting the operat ...
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... levels. The PG pin is an open drain output, requiring a pull-up resistor. If the PG pin is not used, it may be left floating or connected to GND. The power good output (PG) is set floating after the FB pin voltage reaches 95% of its nominal value and stays there until the feedback voltage falls belo ...
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... any voltages (currents actually, but that is a lesson on op amps) that are attached to its inverting (-) input. This configuration does invert the voltage. Why use an inverting amp? You can configure op amps so they don’t invert. However, it is not an easy task to make a summing amp that is non-inve ...
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... used. In terms of bandwidth, slew rate, power dissipation and circuit complexity, the voltage mode devices exhibit the worse performance. Therefore, the current mode devices such as current conveyors and operational transconductance amplifiers (OTA) have became more popular in recent years. The OTAs ...
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... impedance simulators, and oscillators, etc. This currentmode device offers several advantages, such as greater linearity and wider bandwidth over voltage-mode active device likes op-amps [1]. The recently introduced second generation current controlled current conveyor (CCCII) [2-4] has the advantag ...
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... A random-fire SSR may also be used in resistive applications. Some applications require that the load only be energized for a portion of the AC cycle. This can be accomplished with the random SSR’s (due to it’s relatively fast turn-on time), given that an appropriate controller is available. However ...
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... The impedance of the 28 V input source can interact with the DC-DC converter and can affect performance. High source impedance is often caused by a long input cable or components added in series with the input. Source resistance will cause a DC voltage drop as the converter draws DC input current. T ...
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Wilson current mirror



A Wilson current mirror is a three-terminal circuit (Fig. 1) that accepts an input current at the input terminal and provides a ""mirrored"" current source or sink output at the output terminal. The mirrored current is a precise copy of the input current. It may be used as a Wilson current source by applying a constant bias current to the input branch as in Fig. 2. The circuit is named after George R. Wilson, an integrated circuit design engineer who worked for Tektronix. Wilson devised this configuration in 1967 when he and Barrie Gilbert challenged each other to find an improved current mirror overnight that would use only three transistors. Wilson won the challenge.
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