Datasheet

12
Atmel MSL3080 Datasheet
8 String 60mA LED Driver with Integrated Boost Controller
Figure 7.3. Typical Operating Circuit for One 480mA String of 10 White LEDs.
MSL3050/MSL3060/MSL3080 Datasheet
Preliminary
MSL3050/60/80 preliminary datasheet revision 0.1 Page 12 of 24
© Atmel Inc., 2011. All rights reserved.
ENABLE
V
IN
= 5V
EN
SDA
SCL
FLTB
PWM
ILED
PGND EP GND
STR3
STR2
STR1
STR0
CS
GATE
FB
VIN PVIN
I
2
C
INTERFACE
CGND
FAULT
OUTPUT
PWM
INPUT
COMP
MSL3080
STR4
STR5
STR6
STR7
V
LED
V
PWR
= 12V
10 H
25m
2nF
22k
2x
10
F
3.12k
47.5k
93.1k
SCTH
82k
10 F
2x 1 F1 F
B380
FDC5612
18
22
1
23
6
7
8
9
10
11
12
13
2417
15
16
5
20
14
4
3
21
2 19
Figure 4. Typical Operating Circuit for One 480mA String of 10 White LEDs.
Detailed Description
The MSL3050/MSL3060/MSL3080 are LED drivers with five, six and eight internal current regulators respectively, each
capable of driving up to 60mA LED current They feature an integrated boost regulator controller with a proprietary
Efficiency Optimizer voltage control algorithm that lowers power use to the minimum required to assure LED current
regulation. The driver outputs allow parallel connection to increase string current, at the expense of the number of strings,
and a single resistor sets the current for all strings. The drivers support 12-bit PWM LED dimming ratios. The driver
synchronizes LED dimming and controls duty cycle with a single external digital signal at the PWM input.
The MSL3050/60/80 include comprehensive fault monitoring and automatic fault handling. Automatic fault handling allows
the drivers to operate without any microcontroller or FPGA, while optional control via I
2
C allows customized fault handling
and driver control for more complex applications. All drivers also feature optional register-set PWM dimming, fault
management and other controls via the I
2
C serial interface; for interface information see the
MSL3050/60/80/50/60/80/86/87/88 Programming Guide.
The small 4x4mm VQFN package allows a small overall LED driver solution, while maintaining high package power
dissipation for high output power capability.