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AND8492 Capacitive Drop Drive Topology with (AND8492电容驱动拓扑)
AND8492/D
Capacitive Drop Drive
Topology with a Constant
Current Regulator to Drive
LEDs
ON Semiconductor
APPLICATION NOTE
Abstract released a line of Constant Current Regulators (CCRs) that
This Application note describes how to properly and improve efficiency and gain longevity of any end product
efficiently drive light emitting diodes (LEDs) using a needing a constant current.
Constant Current Regulator (CCR) in a capacitive drop LEDs use a combination of radiative recombination and
topology, as shown below in Figure 1. The Capacitive drop localized well modification for recombination of electrons
topology allows for a wide range of end applications while in the conduction band and holes in the valence band that
the CCR will drive the LEDs at their optimal current to dissipate this energy in the form of photons of a specific
improve longevity and reliability. The LEDs themselves and wavelength of light in direct band gap (i.e. III−IV
the LED market is explored as a lead into the justification for compounds). As the recombination well gets thinner the
this type of solution, the mathematical derivation of the energy state of the electron in the conduction band gets
various components is reviewed, concluding with four higher since electrons cannot be at the bottom of a well due
examples, 230 VRMS ±6% 50 Hz, (100 to 127 V) 113.5 V to quantum mechanics. This is shown in Figure 2 below.
RMS ±12% 60 Hz, 120 VRMS ±5% 60 Hz and 240 VRMS ±
10% 50 Hz application. This application note will use the +
a
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