Application Note
17 of 28
V 1.0
2019-01-23
ILD8150 80 V high side buck LED driver IC with hybrid dimming
Measurement results with reference design
4
Measurement results with reference design
Table 1
Typical condition for measurement
Figure 17 shows the actual operating waveforms. The actual measured LED current is 1 A. The switching
frequency is 85 kHz and the internal DMOS transistor on the duty cycle is 74 percent.
Iout
Vsw
Figure 17
Normal operation waveform
4.1
LED current vs supply voltage
ILD8150 provides high output current accuracy despite the changes in supply voltage. Figure 18 shows the
output current vs supply voltage in the range 52 V to 70 V. Over the supply range, the output LED current only
deviates in the range of 1 percent.
V
IN
R
CS
Inductance
LED load
70 V
0.36 Ω
860 µH
17 pcs
