MAX16803ATE+T Maxim Integrated Products, MAX16803ATE+T Datasheet - Page 8
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MAX16803ATE+T
Manufacturer Part Number
MAX16803ATE+T
Description
IC LED DRIVR HIGH BRIGHT 16-TQFN
Manufacturer
Maxim Integrated Products
Type
HBLED Driverr
Datasheet
1.MAX16803ATET.pdf
(11 pages)
Specifications of MAX16803ATE+T
Topology
PWM
Number Of Outputs
1
Internal Driver
Yes
Type - Primary
Automotive
Type - Secondary
High Brightness LED (HBLED)
Voltage - Supply
6.5 V ~ 40 V
Voltage - Output
5.27V
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
350mA
Internal Switch(s)
Yes
For Use With
MAX16803EVKIT+ - EVAL KIT FOR MAX16803
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Efficiency
-
Lead Free Status / Rohs Status
Details
Other names
MAX16803ATE+TTR
Figure 4 shows PWM dimming operation for the
MAX16803 with an ICM7555 timer. The ICM7555 pro-
vides adjustable duty cycle using two external resistors
and a capacitor. In TAIL operation, the output of the
ICM7555 feeds into DIM and lights up the LEDs. The
LED’s brightness depends on the duty cycle of the
ICM7555. When V
V
the LEDs light up to full brightness. See the ICM7555
data sheet for formulas to calculate the dimming fre-
quency and the duty cycle.
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Figure 4. PWM Dimming Operation with ICM7555 Timer
Figure 5. LED Current Thermal Foldback with an NTC Thermistor
8
STOP
_______________________________________________________________________________________
. The PWM dimming operation is disabled and
C3
R3
DIS
TH
TRG
STOP
R2
STOP
TAIL
V
ICM7555
IN
Two Brightness Levels for
C1
IN
is present, DIM is pulled up to
GND
OUT
D3
PWM DIMMING
R1
TAIL/STOP Lights
D4
IN
EN
DIM
GND
D1
D2
C1
MAX16803
With a minimum number of external components, the
MAX16803 provides LED current thermal foldback
using a negative temperature coefficient (NTC) thermis-
tor. Figure 5 shows a thermistor connected to V5 and
the CS+ of the MAX16803. As the temperature increas-
es, the voltage drop across R2 increases causing the
LED current to decrease.
IN
EN
DIM
GND
OUT
CS+
CS-
V5
I
LED
MAX16803
= [V
C2
SENSE
LED Current Thermal Foldback
OUT
CS+
RT
CS-
V5
- [R2 / (R2 + RT)] x V5] / R1
+5V REG
R2
C2
LEDs
R1
LEDs
R
SENSE