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A6217

Allegro
Part Number A6217
Manufacturer Allegro
Description PWM Dimmable Buck Regulator LED Driver
Published Dec 3, 2016
Detailed Description A6217 and A6217-1 Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver FEATURES AND BENEFITS • A...
Datasheet PDF File A6217 PDF File

A6217
A6217


Overview
A6217 and A6217-1 Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver FEATURES AND BENEFITS • AEC-Q100 qualified • 6 to 48 V supply voltage • True average output current control • 3 A maximum output over operating temperature range (1.
5 A for A6217-1) • Cycle-by-cycle current limit • Integrated MOSFET switch • Enable / PWM dimming via direct logic input or power supply voltage • Internal control loop compensation • Undervoltage lockout (UVLO) and thermal shutdown protection • Low power shutdown (1 µA typical) • Robust protection against: ▫ Adjacent pin-to-pin short ▫ Pin-to-GND short ▫ Component open/short faults • Enhancements over A6213: ▫ Dithering of switching frequency to reduce EMI ▫ Able to drive single white LED from 18 V supply at 2.
2 MHz ▫ Smaller package option PACKAGES: 10-pin DFN with wettable flank (suffix EJ) Not to scale 8-pin SOICN (suffix LJ) DESCRIPTION The A6217 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.
A true average current is output using a cycle-by-cycle, controlled on-time method.
Output current is user-selectable by an external current sense resistor.
Output voltage is automatically adjusted to drive various numbers of LEDs in a single string.
This ensures the optimal system efficiency.
LED dimming is accomplished by a direct logic input pulsewidth-modulation (PWM) signal at the enable pin.
The device is provided in a 3 mm × 3 mm wettable flank 10-pin DFN (suffix EJ) or an 8-pin narrow SOIC (suffix LJ), both with exposed pad for enhanced thermal dissipation.
Both packages are lead (Pb) free, with 100% matte-tin leadframe plating.
APPLICATIONS: Automotive lighting • Daytime running lights • Front and rear fog lights • Turn/stop lights • Map light • Dimmable interior lights VIN (6 to 48 V) TYPICAL APPLICATION CIRCUIT GND C1 EN 1, 2 R1 3 VIN TON A6217 (EJ) SW B...


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