Abstract: An inrush current limiter circuit (20) includes a detection circuit (30) that produces a control signal (VDRIVE) from a sense current (ISENSE). A power transistor responds to the control signal and has a source (51) coupled to an input node (12) to receive a supply voltage (ground) and a drain (53) for routing a load current (ILOAD) to an output node (45) as a protection signal (VSW). A sense transistor responds to the control signal and has a source scaled to the source of the power transistor and coupled to the input node to route a portion of the load current to the output node as the sense current.

Abstract: A regulator circuit (10) includes an amplifier (61) having an input for sensing an output signal (VS, ILOAD) of the regulator circuit and an output (13) for producing a transient signal (ITR1, ITR2) in response to a change in the output signal. A feedback path (62, 67, 70) is coupled between the output and the input of the amplifier to set a gain of the amplifier to a first value when the output signal is constant and to a second value when the output signal changes. The feedback path includes a level shift circuit (62, 65) having an input (81) that receives the output signal and an output (83) that produces a level shifted signal for biasing the output of the amplifier to a predetermined level.

Abstract: A regulator circuit (10) includes an amplifier (61) having an input for sensing an output signal (VS, ILOAD) of the regulator circuit and an output (13) for producing a transient signal (ITR1, ITR2) in response to a change in the output signal. A feedback path (62, 67, 70) is coupled between the output and the input of the amplifier to set a gain of the amplifier to a first value when the output signal is constant and to a second value when the output signal changes. The feedback path includes a level shift circuit (62, 65) having an input (81) that receives the output signal and an output (83) that produces a level shifted signal for biasing the output of the amplifier to a predetermined level.

Abstract: A switching power supply (30) receives an AC voltage at a primary side of a transformer (36) and converts it to a regulated DC output voltage at the secondary side of the transformer (36). The switching power supply (30) includes a voltage regulation compensation circuit (52) to monitor the transformers primary side providing a reference signal VREF related to the transformers secondary side. Signal VCOMP is a current reference signal representative of the primary side inductor current flowing through the emitter of a power transistor (38). VCOMP is fed into a sample and hold circuit (70) and amplified to a DC level proportional to the peak level of the inductor current of the power transistor (38). The output of the sample and hold circuit (70) is fed to two inputs of a multiplier circuit (82) where the output thereof is a square of the two inputs fed to a k-factor circuit (83).

Abstract: A bar code reader having a reader module and a terminal module releasably connectable together for communication. Module components may be mounted on a glove to be worn by the user. One of a plurality of gripping portions is selected to provide a desired gripping mode for the reader.

Abstract: An electro-optical system for reading bar code symbols includes a reader module and a terminal module releasably interconnected to each other. The reader module includes a manually actuatable actuator to initiate the reading. Reading is initiated either when the modules are disconnected, or when the modules are interconnected, by manually actuating the actuator in both cases. A keyboard may be provided on either module to facilitate data entry.

Abstract: A portable optical scanning system incorporates a ring mounted optical scanner module which is arranged to transmit data either via radio or cable to a wrist mount unit. The wrist mount unit may either receive and store the information, or it may include a radio transmitter for onward transmission of the data. A variety of different rings, ring mounted scanner modules, wrist mounts and wrist mount units may be provided for various applications, the user simply picking those which are required in any individual case. The scanner module is mounted to the ring by a breakaway element allowing the module easily to break off the mounting to prevent damage and/or injury.