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SP7615 Fiches technique(PDF) 4 Page - Sipex Corporation

No de pièce SP7615
Description  Four Channel Constant Current LED Driver
Download  10 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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Date: 08/31/05
SP7615 Four Channel Constant Current LED Driver
© Copyright 2005 Sipex Corporation
THEORY OF OPERATION
VCC
EN
GND
C1
1n
R1
D1
LED
SP7615
®
EN
GND
LED1
VCC
ISET
LED2
LED3
LED4
The R
SET value may be determined as RSET =
1.26 * 1000/I
OUT, kΩ where 1.26 is a typical
I
SET pin voltage, 1000 is a typical current
multiplication ratio, and I
OUT is a required
LED current in mA.
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 following
charts 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 derates
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


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