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PDF ZXLD381 Data sheet ( Hoja de datos )

Número de pieza ZXLD381
Descripción Single or Multi Cell LED Driver Solution
Fabricantes Zetex 
Logotipo Zetex Logotipo



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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
exhibits
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
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.
Applications
• LED flashlights and torches
• LED backlights
• White LED driver
VIN
L1
VC C
VOUT
GN D
ZXL D381
LE D
Issue 1 - April 2008
© Zetex Semiconductors plc 2008
1
www.zetex.com

1 page




ZXLD381 pdf
www.DataSheet4U.com
ZXLD381
output current of the ZXLD381 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 0.8V 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.
Application Examples
Standard Operating Mode
VCC
L ILED(peak) ILED(avg)
(uH)
(mA)
(mA)
L1
1.5 V
ZXLD381
VOUT
LED
GND
Note: VLED = 3.5V
Low Ripple LED Current Mode
VCC
L1
47 35 6.5
22 80 15
15 120 20
10 190 30
6.8 260 45
4.7 380 55
3.3 510 67
2.2 640 76
L
(uH)
ILED
(mA)
D1
1.5 V
ZXLD381
VOUT
C1
GND
Note: VLED = 3.5V, D1 = ZHCS1000, C1 = 1μF (low ESR)
47 6
22 13.5
15 18
10
LED
6.8
27
41
4.7 50
3.3 61
2.2 69
Issue 1 - April 2008
© Zetex Semiconductors plc 2008
5
www.zetex.com

5 Page










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