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MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
Typical Operating Characteristics (continued)
(V IN = V EN = 12V, f SW = 300kHz, R SETI = 15k I , C VCC = 1 F F, V CC = V DRV , NDRV = COMP = OUT_ = unconnected, V OVP = V CS =
V LEDGND = V DIM = V PGND = V SGND = 0V, load =4 strings of 7 white LEDs, T A = +25 N C, unless otherwise noted.)
5.08
V CC LINE REGULATION
5.10
V CC LOAD REGULATION
2.00
SWITCHING FREQUENCY vs. 1/RT
5.06
5.04
5.02
5.00
4.98
T A = +125 N C
T A = +25 N C
T A = -40 N C
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
T A = +125 N C
T A = -40 N C
T A = +25 N C
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
4.96
5
10
15
20
25
30
35
40
4.90
0
20
40
60
80
0.20
0.02
0.06
0.10
0.14
0.18
0.22
0.26
0.30
V IN (V)
I VCC (mA)
1/RT (mS)
STARTUP WAVEFORM WITH
DIM ON PULSE WIDTH < t SW
MAX16814 toc12
40ms/div
STARTUP WAVEFORM WITH DIM
CONTINUOUSLY ON
MAX16814 toc14
FIGURE 2
V IN
20V/div
0V
V DIM
5V/div
0V
I OUT_
100mA/div
0A
V LED
20V/div
0V
V IN
20V/div
0V
V DIM
5V/div
0V
I OUT1
100mA/div
0A
V LED
10V/div
0V
1.5
1.3
1.1
0.9
0.7
0.5
STARTUP WAVEFORM WITH DIM
ON PULSE WIDTH = 10t SW
MAX16814 toc13
FIGURE 2
40ms/div
MOSFET DRIVER ON-RESISTANCE
vs. TEMPERATURE
pMOS
nMOS
V IN
20V/div
0V
V DIM
5V/div
0V
I OUT1
100mA/div
0A
V LED
10V/div
0V
40ms/div
-50
-25
0
25
50
75
100
125
TEMPERATURE ( N C)
6
Maxim Integrated
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