ISL6745ALEVAL3Z Intersil, ISL6745ALEVAL3Z Datasheet - Page 4

• Manufacturer Part Number: ISL6745ALEVAL3Z
• Description: EVAL BOARD 3 FOR ISL6745
• Manufacturer: Intersil

Specifications of ISL6745ALEVAL3Z

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

and bottom view of the PCB layouts. Gerber files for the
ISL6745ALEVAL3Z board are available upon request.
The performance of the LED driver board will be evaluated
with and without dimmer respectively in the next sessions for
various operation conditions.
FIGURE 10. TOP VIEW OF THE PCB LAYOUT
FIGURE 11. BOTTOM VIEW OF PCB LAYOUT
4
Application Note 1487
Performance Characteristics Without
Dimmer
The schematics and BOM without dimmer are shown in the
last pages of this document. Connect the P1 and P2 of the
LED driver board to the AC power supply. A string of 6 Cree
high power white LEDs areconnected to the output terminal
of the LED driver board. The efficiency of the driver is shown
in Table 1. The operation waveforms are shown in Figures
12 to 18. Figures 12 to 15 show the rectified input voltage
and current for different inputs. Channel 1 (yellow) shows the
rectified input voltage (100V/DIV). Channel 4 (green) shows
the input current (200mA/DIV). The input voltage and input
current waveforms in Figure 16 shows the driver turning off
within 2s. Figures 17 and 18 show the overshot of the LED.
Current is greatly reduced with the delayed start-up circuit.
140.25
130.20
120.12
100.09
(RMS)
110.11
TABLE 1. EFFICIENCY AND POWER FACTOR WITHOUT
90.08
80.07
70.06
60.05
50.04
40.03
30.02
20.01
VAD
(V)
FIGURE 12. INPUT VOLTAGE AND CURRENT @ 140V
C4: IIN, 200mA/DIV
INPUT
DIMMER
(mA)
126
132
140
149
162
176
178
170
162
151
138
116
77
I
POWER
V/INPUT
15.43
15.49
15.52
15.53
15.54
15.51
14.04
11.79
9.68
7.55
5.51
3.48
1.52
(W)
IN
I/INPUT
0.673
0.673
0.672
0.672
0.675
0.671
0.521
0.430
0.338
0.245
0.152
0.058
0.611
(mA)
LED
I
C1: VIN, 100V/DIV
18.584
18.581
18.587
18.584
18.589
18.584
18.412
18.167
17.983
17.738
17.503
17.085
16.420
V/LED
(V)
0.8720 81.06
0.8972 80.73
0.9212 80.48
0.9427 80.41
0.9585 80.74
0.9761 80.40
0.9811 80.13
0.9875 80.28
0.9899 79.88
0.9947 79.41
0.9974 77.83
0.9979 74.62
0.9956 62.66
PF
July 28, 2009
AN1487.0
EFF
(%)