MAX16806EVKIT+ Maxim Integrated Products, MAX16806EVKIT+ Datasheet - Page 10

• Manufacturer Part Number: MAX16806EVKIT+
• Description: EVAL KIT FOR MAX16806
• Manufacturer: Maxim Integrated Products

Specifications of MAX16806EVKIT+

• Current - Output / Channel: 350mA
• Outputs And Type: 1, Non-Isolated
• Features: Dimmable, Extra 5V Output
• Voltage - Input: 5.5 ~ 40V
• Utilized Ic / Part: MAX16806
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -

EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
Figure
10
The MAX16805/MAX16806 are constant-current regu-
lators that provide up to 350mA of current to one or
more strings of high-brightness LEDs. A wide operat-
ing input voltage range of 5.5V to 40V makes the
devices ideal for automotive applications. The
MAX16805/MAX16806 feature the I
allows communication with the internal dynamic regis-
ters and EEPROM.
Dynamic registers control the MAX16805/MAX16806
functions and can be updated in real time through the
I
off the input voltage clears the dynamic register contents.
To save settings, store them into the EEPROM. The
MAX16805/MAX16806 load the stored settings into the
dynamic registers at power-up. In addition, during nor-
mal operation a write command to the EEPROM Content
Transfer register loads the stored settings into the
dynamic register. Information stored can be transferred
into dynamic registers after issuing a “write” command to
the EEPROM Content Transfer register.
The MAX16805/MAX16806’s 5V regulator (V5) provides
up to 2mA of current to external circuitry. However, the
MAX16806’s 5V regulator can deliver 2mA of output cur-
rent only when the momentary switch is not used. When
the momentary switch is active, the MAX16806 achieves
up
MAX16805/MAX16806 feature thermal and output short-
circuit protection. The wide operating voltage range
helps protect the device against large transients up to
45V such as those found in load dump situations.
2
SDA
SCL
C interface. See
______________________________________________________________________________________
to
STOP
1. I
2
C Serial Interface Timing Diagram
0.5mA
t
BUF
START
Table
of
Detailed Description
t
current.
2 for register addresses. Turning
HD:STA
t
LOW
In
t
R
t
HD:DAT
2
C interface that
addition,
t
F
t
HIGH
the
t
SU:DAT
The MAX16805/MAX16806 use a feedback loop to
control the output current. The differential voltage
across the sense resistor is compared to a fixed refer-
ence voltage and the error is amplified to serve as the
drive to the internal pass device, see the Functional
Diagram . The MAX16805/MAX16806 offer a program-
mable LED current reference using the Binning
Adjustment register.
These devices are current controllers internally opti-
mized for driving the impedance range expected from
1 to 10 (or more) high-brightness LEDs.
The MAX16805/MAX16806’s dimming input operates
with either an analog or PWM control signal. If the
pulse detector detects three edges of a PWM signal
with a frequency range between 80Hz to 2kHz, the
MAX16805/MAX16806 synchronize to external PWM
input signal and pulse-width-modulate the LED current.
If an analog control signal is applied to DIM, the
MAX16805/MAX16806 compare the DC input to an
internally generated 200Hz ramp to pulse-width-modu-
late the LED current. The maximum peak value of the
200Hz ramp can be programmed using the Ramp
Peak register. This allows the LED current to be adjust-
ed through the I
real time when V
The output current duty cycle is adjustable from 0% to
100% (0.21V < V
Use the following formula to calculate the output cur-
rent duty cycle:
REPEATED
START
Duty cycle = (V
t
SU:STA
t
HD:STA
2
DIM
DIM
C interface from 50% (typ) to 100% in
is 1.54V.
< 3.1V).
DIM
Dimming Input (DIM)
- 0.21V) / V
t
SP
t
SU:STO
RAMP
P