A6211 ALLEGRO [Allegro MicroSystems], A6211 Datasheet - Page 5

• Manufacturer Part Number: A6211
• Description: Constant-Current 3-Ampere PWM Dimmable Buck Regulator LED Driver
• Manufacturer: ALLEGRO [Allegro MicroSystems]

C1,C2
A6211
Figure 1. Startup waveforms from off-state at various input voltages; note that the rise time of the LED current depends on
input/output voltages, inductor value, and switching frequency
• Operating conditions: LED voltage = 15 V, LED current = 1.3 A, R
• Oscilloscope settings: CH1 (Red) = V
V
CH3 (Green) = i
C3
C4
IN
= 19 V (panel 1A), 24 V (panel 1B) and 30 V (panel 1C)
V
i
V
V
LED
OUT
EN
IN
LED
(500 mA/div), CH4 (Yellow) = Enable (5 V/div), time scale = 50 μs/div
Panel 1A. V
t
C1,C2
IN
C3
C4
(10 V/div), CH2 (Blue) = V
IN
= 19 V
V
V
i
V
LED
OUT
EN
IN
Constant-Current 3-Ampere PWM Dimmable
Characteristic Performance
1
OUT
Panel 1C. V
= 63.4 kΩ (frequency = 1 MHz in steady state),
(10 V/div),
t
C1,C2
C3
C4
IN
= 30 V
V
V
i
V
LED
OUT
EN
IN
Buck Regulator LED Driver
Panel 1B. V
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
t
IN
= 24 V
5