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  • A Digital Constant Current Power LED Driver
    AN1138 A Digital Constant Current Power LED Driver drive current for this type of LED would be 350 mA and Author: Stephen Bowling a typical forward voltage would be 3.5V. Secondly, we Microchip Technology Inc. will assume that the circuit input voltage is 12V. The inductor value will be chosen
  • Increase the Number of Series White LEDs with a "Constant Voltage" OVP Circuit
    A unique over-voftage protection (OVP) circuit is presented for use with the AAT123I, an inductive boast con. stant current wtute LED driver.. The circuit allows transition from constant current to constant voilage at the. OVP threshold, maintaining the programmed output voltage and current during
  • Circut Ideas: LED driver lights three LED strings and provides constant voltage supply
    of producing regulated electrical power. This eliminates the need for extra circuitry otherwise used with a separate power supply. In the accompanying diagram, an LT3476 drives three constant-current RGB LED strings. Its fourth channel serves as a constant-voltage source. A typical application
  • Technical Article: Constant Voltage Transformer Operation
    The CVT (ferro) uses the unique principle of ferroresonance: operation of a transformer in the region of magnetic saturation. When the iron core of a transformer is in saturation, relatively large changes in winding current results in very small changes in magnetic flux. Winding current
  • Voltage-dependent Dynamic FRET Signals from the Transverse Tubules
    was demonstrated. to correspond to the voltage-dependent translocation of the charged acceptors, which manifest as nonlinear. components in current records. For DPA, both electrical and QRET data were predicted by radial cable model. simulations in which the maximal time constant of charge translocation
  • High Voltage, Life Critical, Glove Inflator Redesign
    A prospective customer approached the Field team with a request for a quote on a fastener. Prior to quoting the fastener, Field requested to walk the customer's production floor to review the application of the fastener. The current design required the operator to count out six stainless steel
  • Optimizing Low Voltage Buck DC/DC Converter Efficiency
    by the control circuitry quiescent current. In some instances, lnjit load noise requiremenl:s may supercede efficiency requirements. For Ihis type of appli. cation, constant frequency PWM may be necessary for all load conditions.
  • Application Note: Driving Color RGB LEDs with the AAT3123
    (VF) for the red, green, and blue LEDs. When driven from a common 60mA (ID = 20mA per LED) constant current source, the red LED element of an RGB LED typically has a forward voltage of about 2V. The green and blue LEDs have forward voltage levels of about 3.6V.
  • Parallel & Series Operation
    , there are power converters which feature master slave parallel operation. These units are intended for modular expansion schemes and fault tolerant parallel redundant power systems. Where power converters are overload protected by constant current limiting simple parallelling of the outputs can work
  • Protection For Switching Regulators
    at the output. A synchronous switching step down regulator is shown in Figure 1. The PWM monitors the output voltage V0 through feedback (FB) and adjusts the on time of Q1 in order to keep V0 constant due to the load or line variations. Q2 turns on after Q1 turns off to reduce the forward drop of D1

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