A6217KLJTR-1-T datasheet(5/19 Pages) ALLEGRO

Part #	A6217KLJTR-1-T

Description	Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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5 / 19 page

Automotive-Grade, Constant-Current

PWM Dimmable Buck Regulator LED Driver

A6217 and

A6217-1

5

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

CHARACTERISTIC PERFORMANCE

Panel 1B. VIN = 12 V

Panel 1C. VIN = 18 V

Panel 1A. VIN = 7 V

Figure 1: Startup waveforms from off-state at various input voltages. Note that there is a fixed startup delay of ~70 µs before switching

starts. Subsequent rise time of the LED current depends on input/output voltages, inductor value, and switching frequency.

• Operating conditions: LED voltage = 3.5 V, LED current = 1.5 A, R1 = 73.2 kΩ (frequency = 1 MHz in steady state), L1 = 15 µH,

VIN = 7 V (panel 1A), 12 V (panel 1B), and 18 V (panel 1C)

• Oscilloscope settings: CH1 (Red) = VIN (5 V/div), CH2 (Blue) = VSW (5 V/div),

CH3 (Green) = iLED (500 mA/div), CH4 (Yellow) = Enable (5 V/div), time scale = 20 µs/div

C1,C2

C3

C4

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