1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
Typical Operating Characteristics (continued)
(T A = +25°C, using Figure 5, unless otherwise noted.)
HIGH-SIDE DRIVER (DH) RISE TIME
MAX16818 toc10
C LOAD = 22nF
V IN = 12V
40ns/div
2V/div
HIGH-SIDE DRIVER (DH) FALL TIME
MAX16818 toc11
C LOAD = 22nF
V IN = 12V
40ns/div
2V/div
LOW-SIDE DRIVER (DL) RISE TIME
MAX16818 toc12
C LOAD = 22nF
V IN = 12V
40ns/div
2V/div
LOW-SIDE DRIVER (DL) FALL TIME
FREQUENCY vs. R T
MAX16818 toc13
C LOAD = 22nF
V IN = 12V
2V/div
10,000
1000
100
V IN = 12V
40ns/div
30
70
110
150
190
230
270
310
350
390
430
470
510
R T (k ? )
FREQUENCY vs. TEMPERATURE
SYNC, CLKOUT, AND LX WAVEFORM
260
258
256
V IN = 12V
MAX16818 toc16
SYNC
5V/div
254
252
250
248
246
244
242
240
V IN = 12V
f SW = 250kHz
CLKOUT
5V/div
LX
10V/div
-40
-15
10 35
TEMPERATURE ( ° C)
60
85
1 μ s/div
6
_______________________________________________________________________________________
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