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LX1994 Datasheet

  • LX1994

  • Microsemi Corporation [High Efficiency LED Driver]

  • MICROSEMI

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LX1994
TM
廬
High Efficiency LED Driver
P
RODUCTION
D
ATA
S
HEET
THEORY OF OPERATION (CONTINUED)
Dimming Modes
Microsemi鈥檚 LX1994 provides two dimming options:
PWM or DC voltage input.
PWM dimming
A PWM signal applied to S/P pin (see figure 4). This
PWM signal is scaled to the reference such that a N% duty
cycle PWM signal will produce an LED current of
{
N% 鈥?/div>
(
10碌A+ILS
)
鈥?RBRT
}
RFB
If a light sensor (such as Microsemi鈥檚 LX1970) is used, the
light sensor current is applied to the LS pin and adds to the
10碌A internal current source; in this case the internal
current source determines the adjustment range in a pitch
black ambient. The PWM signal will scale the light sensor
signal allowing the dimming range to increase as the
ambient light increases.
DC dimming mode
In 鈥淒C dimming mode鈥?(see figure 5) the BRT pin input
voltage can be applied directly to BRT pin with the S/P pin
pulled high or developed indirectly by applying a PWM
signal to the S/P pin and using a scaling resistor and filter
capacitor at the BRT pin. The internal current source
produces a 10碌A reference current that is scaled by the
resistance applied to the BRT pin.
Protection and IC Shutdown
OVP:
The LX1994 provides OVP protections.
If the
voltage at the OVP pin exceeds the internal reference
voltage (1.2V), the converter will suspend switching. The
converter will attempt to regulate the OVP pin to its
nominal 1.2V.
IC Shutdown:
To force the IC into shutdown mode, the
S/P pin must pull low for a duration longer 100碌s. In
shutdown mode, the switch is off and the LED string
current typically reduces to a few nano amps of leakage
current.
WWW .
Microsemi
.C
OM
A
PPLICATIONS
A
PPLICATIONS
Copyright
漏
2003
Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6

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