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LDS8680
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 V IN
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 t SETUP- 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 t SETUP-
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 t LO to finalize
command mode
Device starts operating with soft-start at 1-x mode to
minimize inrush current
At 1-x mode, the V OUT is approximately equal to V IN
(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 I LED current.
. The low dropout PowerLite ? Current regulator
(PCR) performs well at input voltages up to 150 mV
above LED forward voltage V F significantly increasing
driver’s efficiency. The LDS8680 monitors voltage
? 2009 IXYS Corp.
Characteristics subject to change without notice
7
Doc. No. 8680_DS, Rev. N1.0
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