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MAX16804 Datasheet(PDF) 8 Page - Maxim Integrated Products

Part No. MAX16804
Description  High-Voltage, 350mA LED Driver with Analog and PWM Dimming Control
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX16804 Datasheet(HTML) 8 Page - Maxim Integrated Products

 
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LED Current Thermal Foldback
With a minimum number of external components, the
MAX16804 provides LED current thermal foldback
using a negative temperature coefficient (NTC) thermis-
tor. Figure 3 shows a thermistor connected to V5 and
the CS+ of the MAX16804. As the temperature increas-
es, the voltage drop across R2 increases causing the
LED current to decrease.
ILED = [VSENSE - [R2 / (R2 + RT)] x V5] / R1
(4)
Other Applications
Figure 4 shows an application circuit with the
MAX16804 using a single BJT to provide high output
current. For proper operation:
VIN(MIN) > VCESAT(MAX) + VFT(MAX) + VRSENSE
(5)
where VCESAT(MAX) is the maximum saturation voltage
of the external BJT.
High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control
8
_______________________________________________________________________________________
IN
EN
DIM
CS-
CS+
OUT
GND
R1
LEDs
VIN
V5
R2
RT
PWM DIMMING
MAX16804
C2
C1
Figure 3. LED Current Thermal Foldback Operation with an NTC Thermistor
IN
EN
DIM
CS-
CS+
OUT
GND
RSENSE
LEDs
Q1
VIN
V5
PWM DIMMING
MAX16804
C2
C1
Figure 4. Increased Output Current (Amper Range) with a Single BJT


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