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High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
Typical Operating Characteristics (continued)
(V IN = 12V, R CS = 4.07 I from CS to GND, C FLTS = 0.1 F F, C IN = 0.1 F F, DIM input unconnected, T A = +25 N C, unless otherwise noted.
Typical values are at T A = +25 N C.)
FAULT INTEGRATION ON OPEN LED
(100Hz, 50% DUTY CYCLE AT DIM)
MAX16839 toc15a
100Hz AT DIM
FAULT INTEGRATION ON OPEN LED
(100Hz, 75% DUTY CYCLE AT DIM)
MAX16839 toc15b
FAULT INTEGRATION ON OPEN LED
WITH SUPPLY CHOPPING
MAX16839 toc16
V FLT
V DIM
5V/div
2V/div
V FLT
V DIM
5V/div
2V/div
V CS
200mV/div
V IN
5V/div
V FLTS
5V/div
I LED
4ms/div
500mA/div
I LED
100μs/div
500mA/div
200 F s/div
Pin Description
PIN
TDFN
1
SO
1
NAME
IN
FUNCTION
Positive Input Supply. Bypass with a 10nF (typ) capacitor to GND.
Dimming Input. Drive DIM high or leave unconnected to turn on the LED current-sink driver.
2
2
DIM
Drive DIM low to turn off the LED current-sink driver. In multiple LED-string applications, connect
all DIM inputs together to synchronize the LED current-sink turn-on.
LED Fault Memory. Connect a 0.1 F F to 10 F F capacitor from FLTS to ground. In multiple LED-
3
3
FLTS
string applications, connect all FLTS pins together to have all strings latch off if one of them
opens (see Figure 2). Connect FLTS to ground to disable fault protection.
4
5
6
—
—
6
7
8
4, 5
—
GND
CS
SINK
N.C.
EP
Ground
Current-Sense Input. Connect a current-sense resistor between CS and GND to program the
output current level.
LED Driver Current-Sink Output
No Connection. Not internally connected.
Exposed Pad. Connect EP to a large-area contiguous copper ground plane for effective power
dissipation. Do not use as the only IC ground connection. EP must be connected to GND.
6
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