Datasheet

100V
I=0mA
IN
TPS7A4001
EN
OUT
FB
C
OUT
R
SET
GND
Low
100V
100V
100V
I
LED
IN
TPS7A4001
EN
OUT
FB
C
OUT
R
SET
GND
EN
I
LED
=
V
REF
R
SET
TPS7A4001
www.ti.com
SBVS162A MARCH 2011REVISED MARCH 2011
APPLICATION INFORMATION
TRANSIENT VOLTAGE PROTECTION not only for driving the intensity of an array of multiple
LEDs by using a PWM signal at its EN pin, but also
One of the primary applications of the TPS7A4001 is
for controlling such an array. This PWM signal
to provide transient voltage protection to sensitive
enables and disables the regulator, causing the LED
circuitry that may be damaged in the presence of
light to vary its intensity.
high-voltage spikes.
Whenever the regulator is disabled, no current flows
This transient voltage protection can be more
through the LED array. This condition means that the
cost-effective and compact compared to topologies
regulator has the same high voltage applied to the
that use a transient voltage suppression (TVS) block.
first LED in the array as is applied to the regulator
input. Figure 15 illustrates the solution to this problem
LED ARRAY DRIVER
with the addition of the TPS7A4001 high-voltage
regulator.
The TPS7A4001 can be used to drive several LED
drivers connected in series, as shown in Figure 14.
Figure 15. LED Array Driver with Regulator
Figure 14. LED Array Driver Application
Disabled
The TPS7A4001 high voltage rating makes it suitable
Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 9
Product Folder Link(s): TPS7A4001