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LDS8680 Datasheet(PDF) 7 Page - IXYS Corporation

Part No. LDS8680
Description  800 mA White LED Driver for Photo Flash
Download  12 Pages
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8680 Datasheet(HTML) 7 Page - IXYS Corporation

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LDS8680
© 2009 IXYS Corp.
7
Doc. No. 8680_DS, Rev. N1.0
Characteristics subject to change without notice
BLOCK DIAGRAM
Figure 2. LDS8680 Functional Block Diagram
BASIC OPERATION
LDS8680 is a charge pump designed for converting
at Li-Ion battery voltage to drive a white LED used in
photo flash applications. The output current has a
maximum value of 800 mA/per channel if one LED
is used or 400 mA/per channel if both LEDs are
used
simultaneously.
The
output
current
is
programmable via the Smart OneWire
™ interface
signaled at the EN pin.
The LDS8680 is in standby mode after applying VIN
voltage until logic HIGH level is applied to EN pin.
The device requires approximately 50 µs to wake
up.
The LDS8680 may operate in either PWM or
command mode.
PWM mode starts if first pulse applied to EN pin
after power-up is shorter than or equal tSETUP- PWM, At
this mode, second and every next pulse applied to
EN pin recognizes as PWM pulse, both LEDA and
LEDB channels are on, and maximum LED current is
equal factory preset value.
The command mode starts if first pulse applied to
EN pin after power-up is longer than or equal tSETUP-
COM. At this mode, every next 16 pulses applied to EN
pin recognizes as command, both LEDA and LEDB
channels are off, and no current is flowing through
LEDs. Command mode is used to set other than
factory preset LED current value, turn on/off one of
the channels, or turn off timeout protection. After
command provided, device goes into PWM mode
with maximum current value and number of channels
in ON state in respect to command provided. EN pin
should be logic LOW for more than tLO to finalize
command mode
Device starts operating with soft-start at 1-x mode to
minimize inrush current
At 1-x mode, the VOUT is approximately equal to VIN
(less any internal voltage losses). If the output
voltage is sufficient to regulate all LED currents, the
device remains in 1-x operating mode.
The charge pump has two modes of operation: 1-x ,
and 2-x. The device changes modes if the output
voltage drops below the minimum needed to support
the desired ILED current.
. The low dropout PowerLite
™ Current regulator
(PCR) performs well at input voltages up to 150 mV
above LED forward voltage VF significantly increasing
driver’s efficiency. The LDS8680 monitors voltage


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