Datasheet

6 Maxim Integrated
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
MAX16814
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= 12V, f
SW
= 300kHz, R
SETI
= 15kI, C
VCC
= 1FF, 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
= +25NC, unless otherwise noted.)
V
CC
LINE REGULATION
MAX16814 toc09
V
IN
(V)
V
CC
(V)
353025201510
5.00
5.02
5.04
5.06
5.08
4.96
4.98
54
0
T
A
= +125NC
T
A
= +25NC
T
A
= -40NC
V
CC
LOAD REGULATION
MAX16814 toc10
I
VCC
(mA)
V
CC
(V)
604020
4.92
4.94
4.96
4.98
5.00
5.02
5.04
5.06
5.08
5.10
4.90
08
0
T
A
= -40NC
T
A
= +25NC
T
A
= +125NC
SWITCHING FREQUENCY vs. 1/RT
MAX16814 toc11
1/RT (mS)
SWITCHING FREQUENCY (MHz)
0.260.220.14 0.180.100.06
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
0.02 0.30
STARTUP WAVEFORM WITH
DIM ON PULSE WIDTH < t
SW
MAX16814 toc12
I
OUT_
100mA/div
0A
V
IN
20V/div
0V
V
DIM
5V/div
0V
V
LED
20V/div
0V
40ms/div
STARTUP WAVEFORM WITH DIM
ON PULSE WIDTH = 10t
SW
MAX16814 toc13
I
OUT1
100mA/div
V
LED
10V/div
0V
0A
0V
V
IN
20V/div
V
DIM
5V/div
0V
40ms/div
FIGURE 2
STARTUP WAVEFORM WITH DIM
CONTINUOUSLY ON
MAX16814 toc14
I
OUT1
100mA/div
V
LED
10V/div
0V
0A
0V
0V
V
IN
20V/div
V
DIM
5V/div
40ms/div
FIGURE 2
MOSFET DRIVER ON-RESISTANCE
vs. TEMPERATURE
MAX16814 toc15
TEMPERATURE (NC)
ON-RESISTANCE (I)
1007550250-25
0.7
0.9
1.1
1.3
1.5
0.5
-50 125
pMOS
nMOS