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ZXLD383 Fiches technique(PDF) 4 Page - Zetex Semiconductors

No de pièce ZXLD383
Description  Single or multi cell LED driver with enable/rectifier input for solar charged lamp applications
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ZXLD383 Fiches technique(HTML) 4 Page - Zetex Semiconductors

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Issue 1 - September 2008
© Diodes Incorporated
Device description
The ZXLD383 is a simple PFM, DC-DC controller combined with a high performance internal
switching transistor, enabling the production of a high efficiency boost converter for use in single
cell applications. It includes a dual function Enable input which serves both as an operation
inhibit control and an ultra-low voltage drop isolation diode for battery charging purposes in
Garden Light applications. A block diagram is shown for the ZXLD383 in Figure 1.
Figure 1 - ZXLD383 block diagram
With power applied and the enable pin held at VCC, an oscillator within the pulse control block
forces the internal switching transistor to switch on to start an energy charge cycle. The low
saturation voltage switch pulls the VOUT pin close to ground which forces the supply voltage
across the external inductor L1. This causes a current to build up, storing energy in the inductor.
During this phase, switch current and supply voltage are monitored and used by the pulse control
circuit to determine the optimum drive conditions and on-time. At the end of the energy charge
cycle, the internal switch is turned off rapidly, interrupting the current flow through L1 which
causes the voltage on VOUT to rise dramatically. When the voltage on VOUT reaches the load LED’s
forward (on) voltage, the inductor current is transferred from the internal switch to the LED,
starting the energy discharge cycle. With the voltage across the inductor reversed, the current
flowing through it (and the LED) now falls. When the inductor current reaches zero, the voltage
on the VOUT pin falls back towards VCC. This action is sensed by the pulse control circuit and is
combined with the output of an off-period timer to initiate the next energy charge cycle. Except
for low level losses, all the energy stored in the inductor during a charge cycle is channelled to
the load LED during the following discharge cycle.
The current fed into the load LED has a sawtooth waveform, the average (DC) value of which is
kept constant by the pulse control circuit for varying supply voltage and temperature. It is
possible to change the output current given by the ZXLD383 by changing the value of inductor
L1. The larger the inductance of L1, the lower the output current. A table/graph showing the
relationship between inductance and output current is given later in this datasheet. Since the
Z XLD 383
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D iode A rra y

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