MAX16836EVKIT+ Maxim Integrated Products, MAX16836EVKIT+ Datasheet - Page 6

• Manufacturer Part Number: MAX16836EVKIT+
• Description: KIT EVAL FOR MAZ16832 LED DRIVER
• Manufacturer: Maxim Integrated Products

Specifications of MAX16836EVKIT+

• Current - Output / Channel: 350mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Features: Dimmable, Extra 5V Output
• Voltage - Input: 6.5 ~ 40V
• Utilized Ic / Part: MAX16836
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
The MAX16836 is a high-current regulator capable of
providing up to a total of 350mA of current to one or
more strings of HB LEDs. A wide operating input volt-
age range of +6.5V to +40V makes the MAX16836
ideal for automotive applications. A +5V regulated out-
put provides up to 4mA of current to power external cir-
cuitry. In addition, the MAX16836 features thermal and
output short-circuit protection. The wide operating volt-
age range helps protect the MAX16836 against large
transients such as those found in load-dump situations
up to 40V.
The MAX16836 uses a feedback loop to control the out-
put current. The differential voltage across the sense
resistor is compared to a fixed reference voltage, and
the error is amplified to serve as the drive to the internal
power series pass device (see the Functional
Diagram ). The regulation point is factory-set at (V
V
defined by the value of R
The MAX16836 is a current controller internally opti-
mized for driving the impedance range expected from
one or more HB LEDs.
6
CS-
_______________________________________________________________________________________
) = 200mV ±3.5%. The regulated current is user
EN
Detailed Description
ENABLE
SENSE
MAX16836
.
GENERATOR
REFERENCE
REGULATOR
IN
CS+
SHUTDOWN
THERMAL
-
V5
The MAX16836 includes a fixed +5V output regulator
that delivers up to 4mA of load current throughout the
+6.5V to +40V input voltage range. Connect a 0.1µF
compensation capacitor from V5 to ground. Shorting
V5 to ground disables the thermal shutdown. When EN
is low, V5 is off. V5 stays on during PWM dimming,
using the DIM input.
The MAX16836 enters a thermal-shutdown mode in the
event of overheating. This typically occurs in overload or
output short-circuit conditions. If the junction tempera-
ture exceeds T
tection circuitry turns off the series pass device. The
MAX16836 recovers from thermal-shutdown mode once
the junction temperature drops by 24°C (typ). The part
therefore protects itself by thermally cycling in the event
of a short-circuit or overload condition. Shorting V5 to
ground disables the thermal shutdown.
The MAX16836 uses a sense resistor across CS+ and
CS- to set the LED current. The differential sense ampli-
fier connected across R
immunity and low-frequency noise rejection. The LED
current is given by:
DIM
I_
REG
1µA
J
Applications Information
= +159°C (typ), the internal thermal-pro-
I
Programming the LED Current
LED
DIFFERENTIAL
AMPLIFIER
= V
SENSE
Functional Diagram
SENSE
IN
SENSE
IN
Thermal Protection
/R
provides ground-loop
SENSE
+5V Regulator
OUT
CS+
CS-