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ZXLD383 Fiches technique(PDF) 6 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) 6 Page - Zetex Semiconductors

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ZXLD383
Issue 1 - September 2008
6
www.zetex.com
© Diodes Incorporated
www.diodes.com
Low ripple LED current mode
It is possible that the peak LED current required to achieve a given average current is either too
high for the LED of choice or it leads to some loss of efficiency (due to LED resistance losses). In
these cases, just two extra low cost components can be added to provide a low ripple current
supply for the LED. The Schottky diode D1 and capacitor C1 rectifies and smoothes the output of
the ZXLD383 giving a low ripple current supply to the load LED. Of course, this circuit could also
be used to power loads other than LEDs.
Note: VLED =3.5V, D1=ZHCS1000, C1 = 1uF (low ESR)
Buck-boost mode
Simple boost converters can run into problems when the input supply voltage is similar to or
exceeds the intended load voltage as there is usually a direct current path from the power source
through to the load via the boost inductor. This path does not require switching action and so is
uncontrolled. When using the ZXLD383, this problem can be avoided by wiring the cathode of the
load LED to Vcc rather than ground. Without switching action, the LED is reverse-biased and so
no current can flow. When switching, the anode of the LED is driven to Vcc + Vf(led). The higher
than normal output voltage reduces the available output current as described earlier and this is
shown in the typical data provided.
Note: VLED =3.5V
L
ILED
(u H )
(m A )
47
7.5
22
15.5
10
31
6.8
46
4.7
58
D1
LE D
C1
Z XLD 383
3
2
1
4
EN A
GN D
VO U T
5
VC C
L1
1. 5V
NC
L
ILED
(u H )
(m A )
47
5.5
22
10.3
10
23.2
6.8
36.7
4.7
46.2
ZXL D 3 8 3
3
2
1
4
EN A
GN D
VO U T
5
VC C
L1
LE D
NC
3V


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