Datasheet

7Maxim 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.)
LED CURRENT SWITCHING WITH DIM
AT 5kHz AND 50% DUTY CYCLE
MAX16814 toc16
I
OUT3
100mA/div
I
OUT4
100mA/div
0A
0A
0A
0A
I
OUT1
100mA/div
I
OUT2
100mA/div
100Fs/div
FIGURE 2
LED CURRENT RISING AND FALLING
WAVEFORM
MAX16814 toc17
V
DIM
5V/div
0A
0V
I
LED
50mA/div
4Fs/div
FIGURE 2
OUT_ LEAKAGE CURRENT
vs. TEMPERATURE
MAX16814 toc20
TEMPERATURE (NC)
OUT_ LEAKAGE CURRENT (nA)
1
10
100
0.1
1007550250-25-50 125
V
DIM
= 0V
V
OUT
= 40V
OUT_ CURRENT vs. 1/R
SETI
MAX16814 toc18
1/R
SETI
(mS)
I
OUT_
(mA)
0.0850.0700.0550.0400.025
40
60
80
100
120
140
160
20
0.010 0.100
OVP LEAKAGE CURRENT
vs. TEMPERATURE
MAX16814 toc21
TEMPERATURE (NC)
OVP LEAKAGE CURRENT (nA)
1007525 500-25
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
-50 125
V
OVP
= 1.25V
COMP LEAKAGE CURRENT
vs. TEMPERATURE
MAX16814 toc19
TEMPERATURE (NC)
COMP LEAKAGE CURRENT (nA)
1007550250-25
0.2
0.4
0.6
0.8
1.0
0
-50 125
V
DIM
= 0V
V
COMP
= 4.5V
V
COMP
= 0.5V
RSDT LEAKAGE CURRENT
vs. TEMPERATURE
MAX16814 toc22
TEMPERATURE (NC)
RSDT LEAKAGE CURRENT (nA)
1007550250-25
100
150
200
250
50
-50 125
V
RSDT
= 0.5V
V
RSDT
= 2.5V