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LDS8720 Datasheet(PDF) 1 Page - IXYS Corporation

Part No. LDS8720
Description  184 WLED Matrix Driver with Boost Converter
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8720 Datasheet(HTML) 1 Page - IXYS Corporation

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LDS8720
© 2011 IXYS Corp.
1
Doc. No. 8720DS, Rev. N1.1
Characteristics subject to change without notice
184 WLED Matrix Driver with Boost Converter
FEATURES
 High efficiency boost converter with the input
voltage range from 2.7 to 5.5 V
 No external Schottky Required (Internal
synchronous rectifier)
 250 mV current sense voltage
 Drives up to 10 LEDs per string
 More than 180 LEDs in matrix
 0.7 MHz Switching Frequency
 Efficiency greater than 83%
 PWM LED Dimming Control Mode
 Over-voltage, under-voltage, over-current,
and over-temperature protection
 Low Shutdown Current (<1µA)
 Available in 2 x 3 x 0.8 mm 8-pin TDFN
package
APPLICATION
 Color Display Backlight
 Portable Navigation and GPS Receivers
 Smart phones
 Digital Photo Frames
 Portable DVD Players
 Architectural Lighting
DESCRIPTION
The LDS8720 is a fixed frequency current mode
boost converter with internal synchronous rectifier
and cycle-by-cycle switch current limit specifically
designed to drive matrix of LEDs in respect with the
Table 1. Operation at 0.7 MHz allows use of small
value low profile inductor (10 – 33 µH) and 1 µF 50 V
ceramic capacitor.
TYPICAL APPLICATION CIRCUIT
The use of integrated synchronous rectifier makes
the
efficiency dependent
on
only inductor DC
resistance. Under-voltage protection disables the part
when VIN voltage reaches 2.0 V.
PVIN voltage may be set equal VIN voltage or higher
up to 15 V to increase power capability of the driver.
Maximum number of LEDs in matrix depends on this
voltage as shown in the table below.
The LDS8720 has thermal shutdown set at 150
0C.
Above
this
value ,
the
boost
converter
stops
switching. The part resumes normal operations when
temperature drops below 130
0C.
The over-current protection provides cycle-by-cycle
current limit.
The internal output over-voltage protection prevents
damage in the case of a faulty LED disconnect.
The PWM control ensures brightness adjustment with
a frequency from 100 Hz up to 30 KHz.
The EN/PWM logic input functions as a chip enable
and LED current PWM contol pin.
The device is available in 8-pin TDFN 2 x 3 mm
package with a max height of 0.8 mm.
Table 1 Matrix configuration for LDS8720
PVIN MIN, V
Number of
LED per string
String
Current
max, mA,
Number
of strings
2.7
10
30
1 – 3
3.0
10
30
1 – 4
4.0
10
30
1 – 5
5.0
10
30
1 – 6
7.5
10
30
1 – 9
10
10
30
1 – 12
12.5
10
30
1 – 15
15
10
30
1 – 18
15
8
30
1 – 23


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