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SP7615 Fiches technique(PDF) 4 Page - Sipex Corporation

No de pièce SP7615
Description  Four Channel Constant Current LED Driver
Download  11 Pages
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Fabricant  SIPEX [Sipex Corporation]
Site Internet  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7615 Fiches technique(HTML) 4 Page - Sipex Corporation

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4
Oct 23-06
SP7615 Four Channel Constant Current LED Driver
© Copyright 2006 Sipex Corporation
THEORY OF OPERATION
The voltage applied to the cathode of each
LED determines the overall efficiency of the
SP7615 circuit. The SP7615 is designed to
be able to sink 125mA at each of its four
outputs; LED1 - 4. The SP7615 is also
designed to be able to handle up to 16V on
these pins. This voltage handling capability
assumes the total power can be dissipated
by the SP7615. The power dissipation inside
the SP7615 will de directly related to the
voltage and current applied to these pins.
For example, the typical operating cathode
voltage is 500mV. At maximum current the
VCC
EN
GND
C1
1n
R1
R2
SP7615
®
EN
GND
LED1
VCC
ISET
LED2
LED3
LED4
SP7615
®
EN
GND
LED1
VCC
ISET
LED2
LED3
LED4
power dissipated by one LED driver output
is 125mA * 500mV = 62.5mW. The charts in
the following pages show the power
dissipation of the SP7615 under various
conditions. The power dissipation should
be kept below 1.3W for safe operation and
long term reliability at room temperature
and derated to 530mW at 85ºC. While the
above operating conditions are recommended,
the part cannot be damaged due to internal
temperature control as described above in
the thermal shutdown section.
CATHODE VOLTAGE, SUPPLY VOLTAGE
AND POWER DISSIPATION
Current sharing capabilities allow two SP7615s to run in
parallel for twice as much current through the LEDs.


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