APEK6211 Datasheet, PDF (1/4 Pages) Allegro MicroSystems – A6211 High-Current LED Driver Evaluation Board

APEK6211
A6211 High-Current LED Driver Evaluation Board
The A6211 is a single IC switching regulator that provides
constant-current output to drive high-power LEDs. It
integrates a high-side N-channel DMOS switch for
DC-to-DC step-down (buck) conversion. The A6211 EVB
(evaluation board) accepts input voltage from 6 to 48 V to
drive a single LED string. LED current can be from several
hundred mA up to 3 A, selected by jumper combination on
the EVB. Switching frequency is fixed at 1 MHz for the
EVB, but it can be easily changed by changing a resistor
(see A6211 datasheet for details).
Allegro offers Gerber files for this evaluation board on
the following website (click on the tab labeled “Technical
Docs”): http://www.allegromicro.com/en/Products/
Regulators-And-Lighting/LED-Drivers-For-Lighting/
A6211.aspx
Figure 1: A6211 Evaluation Board
Quick Startup Guide
1. Connect an LED string between LED+ (anode) and
LED– (cathode).
2. Insert or remove jumpers from P1 to select the appropri-
ate LED current (see Table 1).
3. Connect input power between VIN and GND. For LED
current regulation, the minimum input voltage should
be at least 20% higher than the LED string’s operating
voltage.
4. Connect EN (enable) to a logic high signal, or connect it
to VIN. This will turn on the LED string.
5. For LED dimming: connect EN to a suitable PWM
signal (such as 0-3V, 200 Hz 50%). Vary the PWM duty
cycle between 1% and 100% to control the brightness of
LED string.
Table 1: Jumper Settings vs. LED Current
Jumper 1-2
Jumper 3-4
Jumper 5-6
Jumper 7-8 Approximate
LED Current
(A)
ON
–
–
–
0.3
–
ON
–
–
0.5
–
–
ON
–
1.0
–
–
–
ON
1.5
–
ON
–
ON
2.0
–
–
ON
ON
2.5
–
ON
ON
ON
3.0
Note that due to contact resistance introduced by connectors and jumpers,
the above current settings are approximate.
A6213-DB
November 11, 2016