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SP7619ERL/TR 데이터시트(PDF) 6 Page - Sipex Corporation

부품명 SP7619ERL/TR
상세설명  Constant Current LED Driver
PDF  8 Pages
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제조업체  SIPEX [Sipex Corporation]
홈페이지  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7619ERL/TR 데이터시트(HTML) 6 Page - Sipex Corporation

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6
Feb 9-07 Rev E
Constant Current LED Driver
© 2007 Sipex Corporation
APPLICATION INFORMATION
Shutdown
The SP769 has a low current shutdown
function. In shutdown mode the part draws
lessthanµAcurrentmaximum.Thepartcan
be placed into shutdown using the EN pin.
ENABLE and CTRLpins cannot be tri-stated
or left floating. There are no predefined in-
ternal states, so leaving these pins open will
cause the part to operate incorrectly.
Timeout
A Time Duration Before Shutdown feature
actsasafailsafetoprotecttheLEDfromlong
ON times. The nominal timeout is defined as
4 seconds at 500 (700)mA output current.
Power-on-Reset
This function is used to set Time Duration
counters into their initial state after power up.
No signal applied to the CTRL pin can be
accepted during this time, even if the input
voltage is applied simultaneously to the Vcc
and ENABLE pins.
To obtain the best performance from the
SP769,aprintedcircuitboardwithground
plane is required. High quality, low series
resistance ceramic µF bypass capaci-
tors should be used at the Vcc pin (pin 3).
These capacitors must be located as close
to the pins 3 – 6 as possible. The traces
connecting the pins and the bypassing
capacitor must be kept short and should
be made as wide as possible. Pins  – 2
are connected together internally but we
recommend connecting the LED cathode
to both pins to avoid additional power losses
at high current. Pins 6, 7 and 8 should be
connectedtothegroundplane.Boardlayout
shouldpreventhighLEDgroundcurrentfrom
flowing through signal ground connected to
pin 6. This pin is a separate ground for the
reference and logic sections of the SP769.
The quiescent current for the part flows into
the VCC pin and out of the GND pin. This
current is proportional to the Iled current
divided by approximately 500.
BOARD LAYOUT AND GROUNDING



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