Datasheet

8
Atmel MSL3080 Datasheet
8 String 60mA LED Driver with Integrated Boost Controller
5.0 Typical Operating Characteristics (continued)
(Typical Operating Circuit, unless otherwise stated, TA = +25°C, unless otherwise noted)
MSL3050/MSL3060/MSL3080 Datasheet
Preliminary
MSL3050/60/80 preliminary datasheet revision 0.1 Page 8 of 24
© Atmel Inc., 2011. All rights reserved.
BOOST REGULATOR WAVEFORMS
10% TO 99.5% LED DUTY CYCLE
CH1 = V
LED
, CH2 = V
GATE
, CH3 = V
PWM
, CH4 = I
INDUCTOR
AUTOMATIC PHASE SHIFTED PWM DIMMING
CH1 = V
STR0
, CH2 = V
STR2
, CH3 = V
STR4
, CH4 = V
STR6
BOOST REGULATOR GATE DRIVE RISE/FALL
WITH 3nF CAPACITIVE LOAD
CH2 = V
GATE
MSL3050/MSL3060/MSL3080 Datasheet
Preliminary
MSL3050/60/80 preliminary datasheet revision 0.1 Page 7 of 24
© Atmel Inc., 2011. All rights reserved.
START-UP WAVEFORMS (ZOOM)
CH1 = V
EN
, CH2 = V
LED
, CH3 = V
STRx
, CH4 = I
PWR
AUTO CALIBRATION
CH2 = V
LED
, CH3 = V
STRx
BOOST WAVEFORMS
10% LED DUTY CYCLE
CH1 = V
LED
, CH2 = V
GATE
, CH3 = I
INDUCTOR
BOOST WAVEFORMS
100% LED DUTY CYCLE
CH1 = V
LED
, CH2 = V
GATE
, CH3 = I
INDUCTOR
DRIVER FALL TIME
This scope image shows the voltage (VSTR0) and current (ISTR0)
waveforms for string zero, and their turn-off fall times. Also shown
is the string power supply output (VLED), which shows very little
disturbance. For this photo string 0 is enabled with all other strings
disabled, and a 220pF capacitor in series with a 11Ω resistor in
series is placed from STR0 to GND at the device.
DRIVER RISE TIME
This scope image shows the voltage (VSTR0) and current (ISTR0)
waveforms for string zero, and their turn-on rise times and delay
from PWM rising. Also shown is the string power supply output
(VLED), which shows little disturbance. For this photo string 0 is
enabled with all other strings disabled.