High Performance LED Controller
WWW.Microsemi .COM
LX27901
® High Performance LED Controller
TM
PRODUCTION DATASHEET
DESCRIPTION
KEY FEATURES
The LX...
Description
WWW.Microsemi .COM
LX27901
® High Performance LED Controller
TM
PRODUCTION DATASHEET
DESCRIPTION
KEY FEATURES
The LX27901 is a high performance LED Direct PWM input dimming operation can
controller optimized for LCD-TV and other be realized by inputting a dimming pulse
multi-lamp LCD display systems and train to DIM pin directly.
provides a cost competitive solution for off- The ACU_BRITE algorithm allows the DC
PFC LED drive applications.
to DC converter to be turned off when the
The controller provides a pair of PWM digital dimming operation is at off state to
drive signals with adequate capacity to drive eliminate no-load power losses. The
a half bridge or other double ended DC to controller also provides a proprietary
DC converter circuit with the addition of synchronous regulation function to allow the
simple external circuitry to provide safety user to control the LED current and dimming
isolation.
operation from an un-regulated switching
The device includes a regulated 5.25V power supply source to minimize the number
output (VDD) activated by the ENABLE of power conversion stages and the
input working from the VIN input voltage of associated losses and component costs. In
up to 27V. VDD is capable of providing synchronous regulation mode, AOUT and
5mA source current to external circuitry BOUT form a pair of drive signals to control
while supplying the on chip driver stage and the LED string pairs in AC current mode,
the control circuitry.
and CO...
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