Datasheet

11
Atmel MSL3086/MSL3088 Datasheet
8-String 60mA LED Drivers with Integrated Boost Controller and Phase Shifted Dimming
7.0 Typical Application Circuit
Figure 7.1. Typical Application Circuit
MSL3086/MSL3087/MSL3088 Datasheet
Page 11 of 26
© Atmel Inc., 2011. All rights reserved.
Typical Application Circuit
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
MSL3086
STR4
STR5
STR6
STR7
V
LED
V
PWR
= 6.5V TO 16V
10 H
12.5m
100nF
30k
2x
10
F
3.12k
43.2k
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
220pF
Figure 2. Typical Operating Circuit for Eight 60mA Strings of 10 LEDs each for V
IN
= 6.5V to 16V.
Detailed Description
The MSL3086/87/88 are LED drivers with eight internal current regulators capable of driving up to 60mA LED current
each. The MSL3086/88 feature an integrated boost regulator controller to power the LED strings, while the MSL3087
controls an external DC/DC converter. They provide a complete LED driver solution for multi-LED string applications. A
single resistor sets the LED current for all strings. The MSL3086/87/88 support PWM LED dimming up to 4095:1 and
feature automatic phase shifted dimming, and dimming synchronized with external digital signals. The MSL3088 features
independent frequency and duty cycle control inputs. All devices feature optional register-set PWM dimming, fault and
other controls via the I
2
C serial interface; for interface information see the MSL3040/50/60/86/87/88/89 Programming
Guide.
The MSL3086/87/88 include comprehensive fault monitoring and automatic fault handling. Automatic fault handling allows
the MSL3086/87/88 to operate without any microcontroller or FPGA, while control via I
2
C allows customized fault handling
and device control for more complex applications.