MAX16839ATT/V+T Maxim Integrated, MAX16839ATT/V+T Datasheet - Page 8

• Manufacturer Part Number: MAX16839ATT/V+T
• Description: LED Lighting Drivers High-Voltage Linear High-Brightness LED Driver with LED Fault Open Detect
• Manufacturer: Maxim Integrated

Specifications of MAX16839ATT/V+T

• Input Voltage: 5 V to 40 V
• Maximum Supply Current: 15 mA to 100 mA

The MAX16839 detects an open-LED event when V
drops below 30mV for 25µs. When the fault condition is
detected, a 2.8mA current source charges the capaci-
tor between FLTS and ground, up to 15V or to V
is less than 15V. If the voltage on FLTS is greater than
1.65V due to the charge retained in the FLTS capacitor,
the LED driver is turned off. This provides an open-LED
fault-protection feature that can be disabled by connect-
ing FLTS to ground. In a multistring application (Figure
2), where all FLTS pins are connected together, a fault
detected on one channel causes other channels to turn
off as well. The retention capability on the FLTS is depen-
dent on the leakage current and the value of the capacitor
High-Voltage, Linear High-Brightness LED
Driver with Open-LED Fault Detect
Figure
8
______________________________________________________________________________________
2. Multistring Application
LED
R
50mA
CS
12V
12V FLTS
S
V
I
LEDGOOD (INTERNAL)
LED
IN
I
LED
SINK
CS
MAX16839
GND
IN
0.01FF
C
FLTS
DIM
IN
=
IN
t
t
t
t
if V
DIM SIGNAL
CS
IN
C
FLTS
0.1FF
SUPPLY OR LEAVE
CONNECT TO 5V
V
UNCONNECTED
FLTS SIGNAL
IN
=
= 5V TO 40V
used. If the retention capability is high, the fault condition
could be retained or memorized for a long period after the
supply is turned off.
The MAX16839 enters thermal-shutdown mode in the
event of overheating. When the junction temperature
exceeds T
circuit turns off the series pass element. The MAX16839
recovers from thermal-shutdown mode when the
junction temperature drops to T
not assert during an overheating event.
UVLO
50mA
4Fs
12V
J
= +160NC, the internal thermal-protection
DIM
FLTS
C
0.01FF
IN
=
MAX16839
2.5Fs
GND
IN
I
V
SINK
LED
IN
CS
I
LED
J
t
t
= +145NC. FLTS does
Thermal Protection
LED
R
CS
S