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PDF ZXLD381 Data sheet ( Hoja de datos )
| Número de pieza | ZXLD381 | |
| Descripción | SINGLE OR MULTI CELL LED DRIVER SOLUTION | |
| Fabricantes | Diodes | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ZXLD381 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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A Product Line of
Diodes Incorporated
ZXLD381
SINGLE OR MULTI CELL LED DRIVER SOLUTION
Summary
The ZXLD381 is a single cell LED driver designed for applications where step-up voltage conversion from a very low input
voltage is required. These applications mainly operate from 1.5V or 1.2V cells. The IC generates constant current pulses that
are ideal for driving single or multiple LEDs over a wide range of operating voltages.
The ZXLD381 uses a PFM control technique to drive an internal switching transistor which a low saturation resistance. This
ensures high efficiency, even for input voltages as low as 1V.
The IC can start up under full load and operates down to an input voltage of only 0.9V.
The ZXLD381 is offered in the space saving SOT23 package or in die form, offering an excellent cost vs performance solution
for single cell LED driving applications.
Features
• 85% Efficiency
• User adjustable output current
• Single cell operation (0.9V minimum)
• Low saturation voltage switching transistor
• SOT23-3 package
• Available also in Die form
• Simple Application circuit
Application
• LED flashlights and torches
• LED backlights
• White LED driver
Pin Assignments
SOT23-3
(Top View)
Typical Application Circuit
VIN
L1
VCC
VOUT
GND
ZXLD381
LED
ZXLD381
Document number: DS32188 Rev. 3 - 2
1 of 9
www.diodes.com
May 2010
© Diodes Incorporated
1 page  
Typical Characteristics
10 0
90
2 .2 µ H
80
3 .3 µ H
70
60 4.7µH
50 6.8µH
40
10µH
30
20 15µH
2 2µ H
10 47µH
0
0.8 1 1.2 1.4 1.6 1.8
VCC (V)
IOUT(AVERA GE) vs. VCC for L = 2.2µH to 47µH
2
35 0
30 0
25 0
20 0
15 0
2 .2 µ H
3 .3 µ H
6 .8 µ H
4 .7 µ H
10 0
10µH
15µH
50 22µH
0
0.8
47µH
1 1.2 1.4 1.6 1.8
VCC (V)
IIN vs. VCC for L = 2.2µH to 47µH
2
Notes: VLED = 3.5V for all graphs
A Product Line of
Diodes Incorporated
ZXLD381
10 0
90
47µH 22µH
80 15µH
70 10µH
60
50
6 .8 µ H
40
30 4.7µH
20 3.3µH
10 2.2µH
0
0.8
1 1.2 1.4 1.6 1.8
VCC (V)
Efficiency vs. VCC for L = 2.2µH to 47µH
2
Channel-1 (Upper): ILED @ 100mA/cm
Channel-2 (Lower): VOUT @ 1V/cm
Timebase: 500ns/cm
Operating Waveforms for L = 4.7µH, VCC = 1.5V
ZXLD381
Document number: DS32188 Rev. 3 - 2
5 of 9
www.diodes.com
May 2010
© Diodes Incorporated
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet ZXLD381.PDF ] | |
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