MAX16833EVKIT+ Maxim Integrated Products, MAX16833EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX16833EVKIT+
• Description: KIT EVAL FOR MAX16833 LED DRIVER
• Manufacturer: Maxim Integrated Products

Specifications of MAX16833EVKIT+

• Current - Output / Channel: 1A
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 3 ~ 36 V
• Features: Analog Brightness control
• Voltage - Input: 5 ~ 18 V
• Utilized Ic / Part: MAX16833A/B
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MAX16833 Evaluation Kit
The MAX16833 EV kit provides a proven design to evalu-
ate the MAX16833 high-voltage HB LED driver with inte-
grated high-side current sense. The EV kit is set up for
boost and buck-boost configurations and operates from
a 5V to 18V DC supply voltage. The EV kit is configured
to deliver up to 1A to a series LED string. The string for-
ward voltage can vary from 3V to 36V.
When JU1 is installed, the ICTRL pin is connected to the
voltage-divider of R7 and R8, which sets the voltage at
ICTRL (V
and 890mV when the input supply is 5V. When V
1.23V, the internal reference sets the LED current (I
using the following formula:
In the case of the EV kit, I
1.23V, then V
Alternatively, the analog dimming can be controlled
by removing the shunt of JU1 and applying a voltage
between 0 and 5.5V on the ICTRL pad of the EV kit.
4
Detailed Description of Hardware
______________________________________________________________________________________
ICTRL
ICTRL
) to 1.29V when input supply is above 7V
Analog Dimming Control (ICTRL)
sets the LED current level.
I
LED
=
LED
200mV
R4
is set to 1A. If V
ICTRL
ICTRL
LED
>
<
)
Pulse dimming can be achieved by applying a pulsating
voltage source on the PWMDIM pad of the EV kit. When
PWMDIM is pulled low, DIMOUT is pulled high and the
pulse-width modulated (PWM) switching is disabled.
When JU3 is in the 2-3 position and JU2 is not installed,
frequency dithering is achieved.
The devices can be synchronized to an external clock
by applying a synchronizing pulse on the RT/SYNC
input pin. Refer to the MAX16833/MAX16833B IC data
sheet for more information regarding synchronizing to an
external clock. Frequency dithering must be disabled for
external frequency synchronization.
For evaluating the MAX16833B, replace the MAX16833
on the EV kit with a MAX16833B. The jumper configura-
tions are as follows: JU1 (open shunt position), JU2 (1-2
shunt position), JU3 (1-2 shunt position). See Table 1 for
details.
Frequency Synchronization (RT/SYNC)
Pulse-Dimming Input (PWMDIM)
Frequency Dithering (LFRAMP)
Evaluating the MAX16833B