ISL1903 Datasheet, PDF (12/19 Pages) Intersil Corporation – Dimmable Buck LED Driver - AC Mains or DC Input LED Driver

ISL1903
Test Waveforms and Circuits (Continued)
OC THRESHOLD
OC
OUT
LEADING EDGE BLANKING
OC PROPAGATION DELAY
OC + LEB TO OUT DELAY
FIGURE 4. OC +LEB TO OUT DELAY
Typical Performance Curves
1.001
1.000
0.999
0.998
0.997
0.996
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
FIGURE 6. REFERENCE VOLTAGE vs TEMPERATURE
AC
MAINS
t_DELAY
tDELAY
DHC
FIGURE 5. AC MAINS TO DHC TIMING
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100
AC CONDUCTION ANGLE (% DUTY CYCLE 120Hz)
FIGURE 7. EA REFERENCE vs AC SIGNAL DUTY CYCLE
2.5
2.0
1.5
1.0
0.5
0
0 25 50 75 100 125 150 175 200 225
DELAY RESISTANCE (kΩ)
FIGURE 8. DELAY vs DELADJ RESISTANCE
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80 90 100
AC CONDUCTION ANGLE (% DUTY CYCLE 120Hz)
FIGURE 9. PWMOUT DUTY CYCLE vs AC SIGNAL DUTY CYCLE
12
FN8285.1
September 20, 2012