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ZXLD383 Fiches technique(PDF) 5 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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Fabricant  ZETEX [Zetex Semiconductors]
Site Internet  http://www.diodes.com/
Logo ZETEX - Zetex Semiconductors

ZXLD383 Fiches technique(HTML) 5 Page - Zetex Semiconductors

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ZXLD383
Issue 1 - September 2008
5
www.zetex.com
© Diodes Incorporated
www.diodes.com
output current of the ZXLD383 is a sawtooth waveform, its peak value is substantially larger than
the DC/average value. The table also provides this data.
The internal switching transistor has a minimum collector-emitter breakdown voltage of 20V and
this sets the maximum load voltage allowable. The minimum value is set by a feature of the pulse
control circuit that requires the load voltage to be at least 0.5V greater than VCC. (The device will
function with load voltages smaller than this but output current regulation will be impaired.)
Higher than nominal load voltages will lower the average (DC) output current generated for a
given inductor value.
The Enable pin inhibits the operation of the output switch if held at a potential of Vcc-0.8V or
lower. It also includes a diode to ground which allows the input to be wired directly to a photocell
array that will then both enable operation of the converter when in darkness and charge the IC’s
power source in daylight conditions. The diode function is performed by an active circuit that
gives an ultra low forward voltage drop (typically less than 0.1V at 20mA). This allows the use of
a lower output voltage photocell array (lower cost) without degrading performance.
Application Examples
Apart from the Garden Light application circuit shown on the front page of this datasheet, the
ZXLD383 may be used in many other ways. The following circuits and notes show some other
possibilities and give typical performance details.
Standard operating mode
The following circuit demonstrates how few components are required to produce a light source
using the ZXLD383. Operating from a single cell, this simple circuit is suited for use in car key
fobs, novelty products etc. where small size and low cost are critical aspects.
By directly wiring the Ena pin to Vcc, the part is permanently enabled once a power supply is
provided. The ZXLD383 is highly tolerant of supply ripple so no decoupling of Vcc should be
needed in a compactly constructed circuit. Also, the part’s capability of operating with a Vcc
below 0.9V means that this simple circuit will make the best use of available battery capacity.
The attached table shows the average LED currents that can be obtained using a range of inductor
values. Also shown are the peak currents required to achieve the given currents.
Note VLED = 3.5V
L
ILED(peak )
ILED(avg)
(u H )
(m A )
(m A )
47
45
8.5
22
100
17.3
10
210
34
6.8
330
50
4.7
415
63
ZXL D 3 8 3
3
2
1
4
EN A
GN D
VO U T
5
VC C
L1
1. 5V
LE D
NC


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