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August 2014 DocID026800 Rev 1 1/4
STEVAL-ILL035V2
Multi-channel LED driver with integrated boost controller for
medium/large LCD panel backlight based on LED7708
Data brief
Features
Wide DC input voltage: 10 V - 28 V
16-channels with up to 85 mA /channe l cur rent
capability and independent PWM brightness
control
Up to 15 white LEDs per channel
Embedded open-channel and LED short-circuit
faults management
Expansion connector to cascade other
STEVAL-ILL035V2 evaluation boards
RoHS compliant
Description
The STEVAL-ILL035V2 product evaluation board
is an extension (daughterboard) of the STEVAL-
ILL035V1 (motherboard) based on the LED7708
LED driver. It allows implementation of a daisy-
chained configuration for applications requiring
more than 16 channels.
The LED7708 is configured as slave on the
STEVAL-ILL035V2, and as master on the
STEVAL-ILL035V1.
The boost controller section is not used and the
supply voltage for th e LED stri ngs is d erived from
the motherboard (STEVAL-ILL035V1, master) by
extending the output volt age optimization through
dedicated hand-shake signals. Additional
daughterboards can be connected to a single
motherboard to incr ease the numb er of chann els.
The brightness control of the LED strings and the
fault management options are identical to the
ones available for the STEVAL-ILL035V1
evaluation board. The evaluation board is
intended as a solution for medium/large LCD
panel backlight drivers, but is suitable for any
application involving several LEDs arranged is
strings (e.g. advertisement panels, signs, gaming,
etc.).
www.st.com
Schematic diagram STEVAL-ILL035V2
2/4 DocID026800 Rev 1
1 Schematic diagram
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DocID026800 Rev 1 3/4
STEVAL-ILL035V2 Revision history
4
2 Revision history
Table 1. Document revision history
Date Revision Changes
08-Aug-2014 1 Initial release.
STEVAL-ILL035V2
4/4 DocID026800 Rev 1
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