Automotive-Grade, Constant-Current 2 A

PWM Dimmable Buck Regulator LED Driver

A6214 and

A6216

8

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

ANALOG DIMMING INPUT

Input Voltage for 100% LED Current

2.1

–

–

V

Regulation Threshold at 50% Analog

Dimming

–

100

–

mV

Regulaton Threshold at 20% Analog

Dimming

38.4

40

41.4

mV

FAULT PIN (A6216 ONLY)

FAULT Pull-Down Voltage

–

–

0.4

V

FAULT Pin Leakage Current

–

–

1

µA

TIMERS

Cool Down Timer for Fault Retry

–

1

–

ms

Delay Timer for Reporting LED Open

Fault

–

50

–

µs

THERMAL SHUTDOWN

150

165

180

°C

Thermal Shutdown Hysteresis

–

25

–

°C

1

In test mode, a ramp signal is applied across CSH and CSL pins to determine the CS regulation threshold voltage. In actual application, the average

2

The internal linear regulator is capable of supplying up to 10 mA to external devices.

3

Determined by design and characterization. Not production tested.