MAX16839 Datasheet, PDF (6/11 Pages) Maxim Integrated Products – High-Voltage, Linear High-Brightness LED Driver with Open-LED Fault Detect

High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
Typical Operating Characteristics (continued)
(VIN = 12V, RCS = 4.07I from CS to GND, CFLTS = 0.1FF, CIN = 0.1FF, DIM input unconnected, TA = +25NC, unless otherwise noted.
Typical values are at T_A = +25NC.)
FAULT INTEGRATION ON OPEN LED
(100Hz, 50% DUTY CYCLE AT DIM)
MAX16839 toc15a
100Hz AT DIM
VFLT
5V/div
FAULT INTEGRATION ON OPEN LED
(100Hz, 75% DUTY CYCLE AT DIM)
MAX16839 toc15b
VFLT
5V/div
FAULT INTEGRATION ON OPEN LED
WITH SUPPLY CHOPPING
MAX16839 toc16
V_CS
200mV/div
VDIM
2V/div
V_DIM
2V/div
ILED
500mA/div ILED
500mA/div
V_IN
5V/div
VFLTS
5V/div
4ms/div
100µs/div
200Fs/div
PIN
TDFN SO
1
1
2
2
3
3
4
6
5
7
6
8
—
4, 5
—
—
NAME
IN
DIM
FLTS
GND
CS
SINK
N.C.
EP
Pin Description
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.
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 0.1FF to 10FF capacitor from FLTS to ground. In multiple LED-
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.
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.
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